Tools starting with S

Sacred Geometry Generator

Generate sacred mathematical patterns like Flower of Life, Sri Yantra, and Metatron Cube.

Safe Defrost Time Calculator

Work out how long frozen food needs to thaw safely, and exactly when to move it out of the freezer.

Safe Listening Volume Guide

See how long headphone listening is considered safe at a given decibel level using the WHO-ITU 80 dB for 40 hours weekly sound allowance.

Safe Score Target Setter

Set a buffered exam target above the expected cutoff using past cutoff spread and the confidence level you want.

Safe-to-Spend Daily Planner

See exactly how much you can spend per day for the rest of this month after bills and savings.

Safety Checklist

Step-by-step safety checklists for a gas leak, home fire prevention, night driving and open water swimming.

Salary Hike Real Value Calculator

See what an appraisal is really worth after marginal tax, cess, surcharge and inflation.

Salary In-Hand Calculator (CTC to Take-Home)

Convert annual CTC to monthly take-home pay with PF, professional tax, and FY 2025-26 new-regime income tax.

Salary Slip Generator

Create a formatted salary slip with earnings, deductions, net pay and amount in words.

Sales Tax Calculator

Calculate sales tax and the final total for any purchase amount.

Sample Size & Power Calculator

Estimate the sample size a study needs from your target effect size and statistical power.

Sandpaper Grit Selector

Builds the grit sequence from stripping to final finish for your material, with FEPA to CAMI conversion, sheet counts and sanding time.

Sarcasm Generator

Generate perfectly sarcastic responses for any situation. Because nothing says 'I care' like thinly veiled contempt.

Sauna Fluid Loss Estimator

Estimate sweat lost per sauna session from weight change or temperature and duration, plus the volume to drink back.

Savings Account Interest Calculator

Savings account interest on daily closing balance, credited quarterly, with a quarter-by-quarter breakdown.

Savings Goal Calculator

Calculate how much you need to save monthly to reach your financial goals. Adjust for time horizon and expected returns.

SBOM Generator

Generate a local CycloneDX JSON SBOM from bounded npm manifest or lockfile data with explicit incomplete-inventory and metadata policies.

SBV To SRT Converter

Convert YouTube SBV caption exports into standard SubRip .srt files, with speaker markers, renumbering and timing offset.

Scam Explainer

How UPI refund, fake customer care, task-based job, SIM block, traffic challan, parcel customs, matrimonial and other scams work, and how to stay safe.

Scam Message Triage

Review SMS, WhatsApp, and email text locally for common scam warning patterns and get safer next steps without sending the message anywhere.

Scan Line Overlay Generator

Create CRT scan line, aperture grille and RGB mask overlays as transparent SVG or PNG with copyable CSS.

Schema Markup Generator

Generate JSON-LD schema markup for FAQ, Product, Article, Local Business, Event, Recipe, Job Posting and 6 more types with live required-field checks.

Scholarship Deadline Tracker

Track scholarship application windows and document deadlines — see days left, what is closing soon and what has already shut.

Scholarship Income Certificate Helper

Total your family's annual income the way income certificates require and check it against common scholarship income ceilings.

School Attendance Percentage Tracker

Track school attendance across the session against the 75% board exam eligibility rule, with a leave budget and end-of-year projection.

School Bag Weight Checker

Check a school bag against the 10% of body weight rule and the class-wise weight limits in India's School Bag Policy 2020.

Scientific Calculator

Advanced scientific calculator. Features algebraic entry, trigonometrics (sin, cos, tan), logarithms (log, ln), brackets, powers, and logs.

Scientific Notation Calculator

Convert large or tiny numbers into scientific and engineering notation.

Scope-Creep Change-Order Builder

Turn a new request into a change order showing the price and deadline delta.

Screen and Display Fingerprint Viewer

See the resolution, pixel ratio, colour depth and window signals every website can read from your display.

Screen Recorder

Record your screen and share it with your friends.

Screen Recording Redactor

Hide sensitive areas in a screen recording with timed solid, blur, or pixelated regions, then export a flattened WebM locally.

Screen Share Privacy Guard

Privately preview a selected screen or window, place rehearsal covers, and complete a local privacy checklist before sharing.

Screen Viewing Distance Calculator

Ideal eye-to-screen distance from diagonal size, aspect ratio and resolution, using pixel density, the SMPTE and THX viewing angles and desk ergonomics.

Screen-Reader Landmark Map

Turn pasted HTML into a local landmark and heading outline with structural review cues, without executing or rendering the source.

Screenshot Change Detector

Compare two screenshots and detect visual differences with pixel-level accuracy.

Screenshot Compare

Compare two screenshots side-by-side, with a draggable slider, or as a pixel-difference overlay. Perfect for UI review, version tracking, and QA testing.

Screenshot OCR Change Comparator

Compare two local screenshot previews through reviewed OCR transcripts with deterministic line and word change counts.

Screenshot Privacy Masker

Hide sensitive screenshot regions locally with solid masks, blur, or pixelation, then export a flattened image.

Screenshot Tool

Capture beautiful screenshots of any website instantly in PNG, JPG, or GIF format.

SCSS Quarterly Payout Calculator

SCSS quarterly interest payout, five-year total interest, TDS threshold check and premature closure deductions.

Seasonal Color Analysis

Discover your personal color season — Spring, Summer, Autumn, or Winter — based on your skin tone, hair, and eye color. Get your custom palette.

Seasonal Home Maintenance Checklist

Build a season-by-season home maintenance checklist tuned to your climate zone, home type and the systems you actually own.

Second Car Affordability Checker

Test a second vehicle against the 20/4/10 rule, your EMI-to-income ratio, emergency savings and parking.

Secret & Credential Leak Scanner

Scan pasted text, local source files, logs, and bounded ZIP archives for likely exposed credentials without uploading their contents.

Secret Message Encoder

Encode, decode, inspect, copy, share, and export secret-message payloads with classical ciphers, Base64, URL, Morse, binary, and AES-GCM.

Secret Santa Pair Generator

Generate secret santa pair outputs quickly for sharing, planning, or creative work.

Secrets Rotation Schedule Planner

Build a rotation calendar for API keys, tokens, passwords and certificates with owners, due dates and overdue flags — all in your browser.

Section 138 Notice Draft Assistant

Structure a Section 138 cheque-bounce notice draft against a versioned checklist.

Section 24B Home Loan Interest Deduction

Deductible home loan interest under Section 24(b) for self-occupied and let-out property, with the Rs 2 lakh cap.

Section 44ADA Calculator

Presumptive income and tax for professionals under Section 44ADA, with turnover limit checks.

Section 80D Health Insurance Deduction Calculator

Compute your Section 80D deduction for self, family, parents and senior citizens, including the preventive checkup cap.

Section 80E Education Loan Interest Deduction

Estimate the education loan interest you can deduct under Section 80E and track the 8-year eligibility window.

Section 87A Rebate Checker

Check whether your taxable income qualifies for the Section 87A rebate and how much tax it wipes out.

Security Deposit Refund Calculator

Work out the rental deposit due back after unpaid rent, damages, utilities and notice shortfall, with the Model Tenancy Act cap.

Security Headers Checker

Review pasted response headers for missing defensive controls.

Security Question Answer Generator

Generate false but memorable answers to security questions so nobody can research their way into your account.

Self OSINT Query Builder

Build search queries to audit your own public footprint on Facebook, Instagram, LinkedIn and YouTube.

Self Signed Certificate Risk Explainer

Scores a self-signed or private-CA TLS setup by context and trust model, and says exactly what it protects against and what it does not.

Semester Exam Countdown Board

See days left to each semester paper on one board, with per-subject readiness bars and at-risk flags for weak subjects close to their date.

Semester To Quarter Credit Converter

Convert college credits between semester and quarter systems with the standard 1 semester = 1.5 quarter unit ratio.

Semver Range Explainer

Explain what a caret, tilde, hyphen, x or comparator semver range actually allows, in plain English with examples.

Senior Calorie Needs Calculator

Daily calorie needs for adults over 50 using the Mifflin-St Jeor equation, with activity factors, a safe intake floor and senior protein targets.

Senior Citizen FD Extra Rate Calculator

What the extra senior citizen deposit rate is worth, with the ₹1 lakh TDS threshold and the section 80TTB interest deduction.

Senior Citizen Savings Scheme Calculator

Work out SCSS quarterly interest payout, annual income, total interest and maturity value from your deposit at the current rate.

Senior Device Permission Audit

A senior-friendly walkthrough for reviewing and cleaning up phone app permissions.

Senior Protein Distribution Planner

Spread an older adult's daily protein target evenly across meals using the PROT-AGE and ESPEN g/kg bands and the per-meal muscle-synthesis threshold.

Senior Sleep Routine Planner

Build a bedtime, wind-down, caffeine cut-off and nap schedule backwards from your wake time, sized for age-related sleep changes.

Sensory Detail Prompt Generator

Generate scene prompts across sight, sound, smell, taste, touch and body, then scan your draft for the senses it is missing.

Sentence Correction Practice

Master English grammar by identifying and correcting errors in sentences with detailed explanations.

Serialization Format Chooser

Rank JSON, Protocol Buffers, Avro, MessagePack and CBOR against your own requirements and see why each wins or loses.

Service Mesh Comparison Tool

Compare Istio, Linkerd, Consul and Cilium on features, resource overhead and operational cost, weighted by your priorities.

Severe Weather Watch

Aggregate official severe weather warnings issued near your location.

Sexual Health Test Tracker

Keep test dates, results and retest reminders in one private place.

SGPA Calculator

Calculate your semester SGPA using your university's grade points and credits: VTU, AKTU, JNTU, SPPU, IPU, KTU or any credit-weighted scheme.

SGPA To CGPA Calculator

Combine semester SGPAs with their credits into a cumulative CGPA, see the running trend, and convert it to a percentage.

SHA-256 Hash Generator

Generate a SHA-256 hash of any text, computed securely in your browser.

SHA1 Hash Generator

Generate a SHA1 hash of any text, in your browser.

Shannon Entropy Explorer

Visualize the Shannon entropy of any text or probability distribution you enter.

Shared Family Password Plan Builder

Decide which household logins to share, which to keep individual and which need emergency access instead.

Shared Flat Rent Split Calculator

Split flat rent between flatmates by room size, amenities and occupancy, with whole-rupee shares that add up exactly.

Shared-Resource Conflict Resolver

Resolve booking conflicts over shared rooms, vehicles or equipment.

Sharpe & Sortino Calculator

Compare a return series' risk-adjusted performance using the Sharpe and Sortino ratios.

Shift Sleep Planner

Plan sleep and naps around night shifts, early morning shifts or exam season, with caffeine and light timing.

Shift-Rotation Fairness Auditor

Score how fairly nights, weekends and workload are split across team members.

Shipping and Delivery Policy Generator

Generate a shipping policy with zone-wise timelines, cut-off logic, COD rules and damaged-parcel steps, with a working-day ETA calculator.

Shoe Selection Planner for Trips

Find the fewest pairs of shoes that cover every condition on your trip — walking, formal, wet, beach or trail — and the lightest set among them.

Shoe Size Converter

Convert UK, US, EU, and Indian shoe sizes for men, women, and kids — or find your size from foot length in cm.

Shoot Budget Calculator

Build a line-item shoot budget from crew day rates, gear, location, travel and post hours, with contingency and GST.

Short Modern Indian Baby Names

Browse modern Indian baby names of two to six letters with meanings, and a spelling-ease score that flags the romanisation traps in each one.

Short Term Capital Gains Calculator on Shares

Section 111A short term capital gains tax on listed equity, with STT context, deductible charges and the basic exemption adjustment.

Short-Video Hook Marker

Mark hook, beat and review timestamps along a short video's timeline.

Shorts Vs Long Form Time Planner

Split weekly production hours between Shorts and long videos by solving every feasible split for the best expected return.

Shot List Planner

Plan scenes, sequence shots, track production status, manage gear notes, and export printable shooting sheets.

Shower Water Usage Calculator

Compare bucket bath, hand shower and rain shower on litres, geyser units and rupees per bath, per month and per year.

Shutter Angle Calculator

Convert between shutter angle and shutter speed at any frame rate, with a flicker check for 50 Hz and 60 Hz mains.

Sibling Name Match Finder

Enter an older child's name and get ranked sibling name suggestions scored on shared origin, syllable rhythm, ending, length and distinctness.

Sick Leave Email Generator

Write a short, professional sick leave email with cover arrangements, a return date and a brevity check.

Sign Language Alphabet Poster Maker

Build a printable ASL manual alphabet and number poster with adjustable columns, descriptions, look-alike warnings and a quiz mode.

Sign Language Alphabet Trainer

Learn American Sign Language (ASL) alphabet with interactive cards, quizzes, and progress tracking

Signature Maker

Draw, type or upload your signature and download it as a transparent PNG, white-background JPG or SVG, trimmed and sized for online forms.

Significant Figures Calculator

Count significant figures with the reason for every digit, round to any number of sig figs, and add, subtract, multiply or divide using sig-fig rules.

Silence & Filler-Word Cutter

Removes long silences from an audio recording using an adjustable loudness threshold.

Silly Mistake Tracker

Log avoidable errors from each mock test by category and watch the count and marks lost fall (or not) across attempts.

Silver Investment Return Calculator

Track silver purchase cost, GST, buyback discount and post-tax return with an annualised figure.

SIM Swap Recovery Pack

Build a local, prioritised recovery checklist for possible SIM-control loss across carrier, banking, email, sessions, and evidence without entering secrets or account identifiers.

Simon Says Game

Train your memory with the classic Simon Says game featuring multiple modes, difficulty levels, sound effects, and score tracking.

Simple Interest Calculator

Solve simple interest, principal, rate or time from the other three, with a yearly table.

Sinclair Coefficient Calculator

Convert an Olympic weightlifting total into a Sinclair total using the official IWF bodyweight coefficient formula.

Sinking Fund Calculator

Work out the monthly reserve for known irregular bills like insurance, servicing, fees and travel.

SIP Calculator

Estimate SIP maturity value, invested amount, and wealth gain with annual step-up.

SIP Goal Reverse Calculator

Work backwards from a target amount and target date to the exact monthly SIP you need, with step-up and inflation options.

SIP Top Up Percentage Calculator

See how raising your SIP by a fixed percentage every year changes the final corpus, the amount invested and the date you hit your goal.

Sit and Reach Flexibility Test

Score a sit-and-reach box reading against age and sex flexibility norms, in cm or inches, and track change between tests.

Sit to Stand Test Tracker

Score a 30-second chair stand test against the Senior Fitness Test normal range for your age and sex, and log the change.

Sit-Stand Ratio Planner

Turn your workday and seated meeting hours into a clock-timed sitting and standing rotation with posture-change warnings.

Sitemap Generator

Create standard XML sitemaps containing page URLs, update frequency, priority levels, and modification dates to optimize crawling.

Situp Standard Benchmark

Score a one-minute sit-up test against age and sex fitness bands, with any test length normalised to 60 seconds.

Skill Demand Analyzer

Score how much the job market wants a skill from live openings, year-on-year growth, applicants per posting, salary premium and remote share.

Skin Care Guide

Get personalized skincare tips for glowing and healthy skin.

Skin Tone Analyzer

Capture from your webcam or upload a photo to identify surface tone, Fitzpatrick type, and get personalized wardrobe and cosmetic color advice.

Skin Undertone Checker

Discover your skin undertone — warm, cool, or neutral — using AI-powered color analysis. Find the perfect foundation, lipstick, and jewelry matches.

Skipping Rope Outdoor Calorie Tool

Interval skipping calorie estimator using round, work and rest inputs with Compendium MET values for each skip rate.

Skirting Length Calculator

Work out skirting running length, number of pieces, corners, fixings and cost from room size minus doorways.

SLA Uptime Downtime Calculator

Convert an SLA uptime percentage into allowed downtime per day, week, month, quarter and year — and back.

Sleep Calculator

Find the best bedtimes or wake-up times based on 90-minute sleep cycles and how long you take to fall asleep.

Sleep Debt Calculator

Log your last two weeks of sleep to see how many hours you owe, and get a realistic plan to repay it.

Sleep Efficiency Calculator

Turn a night's sleep diary into sleep efficiency, total sleep time and the time-in-bed window used in sleep restriction therapy.

Sleep Hygiene Checklist

Score your bedroom, daily habits and bedtime routine against sleep hygiene basics, with impact-ranked fixes and cut-off times.

Sleep Sound Fade Timer

Play calming brown noise, rain, surf or fan hum that holds steady then fades to silence on a timer as you fall asleep.

Sleep Tracking & Sleep Quality Analyzer

Track your sleep habits, automatically calculate sleep debt and efficiency, and get personalized recommendations.

Sliding Puzzle

Free 15 puzzle sliding number game online — solve 3x3, 4x4 and 5x5 boards in the fewest moves.

Slope Calculator

Find the slope between two points as a fraction and decimal, plus angle, % grade, distance, midpoint and the line equation in three forms, with a graph.

Slope Percent Degree Converter

Convert slope between percent grade, degrees, 1-in-X ratio, inches per foot and roof pitch for ramps, drains and roofs.

Slow Motion Frame Rate Planner

Work out the capture frame rate, speed percentage, shutter speed and light loss for any slow-motion target.

Slow Speech Playback Trainer

Slow down and loop a full audio file for practice while preserving the original pitch.

Slug Generator

Convert titles into clean URL slugs with transliteration, stop-word removal and length limits.

Small Caps Generator

Convert text into ꜱᴍᴀʟʟ ᴄᴀᴘꜱ unicode letters for bios and posts.

SMART Goal Planner

Score a goal against all five SMART criteria, track milestones, and check whether the pace you are holding will hit the target by the deadline.

Smart Grocery List Builder

Build categorised grocery lists with smart auto-sorting, check-off shopping mode, restock suggestions, and easy sharing.

Smart Home Power Budget

Add up the standby and active power of every smart device and hub in your home, with daily kWh, running cost and the always-on vampire load.

Smart Home Privacy Guide

Privacy settings for smart speakers, video doorbells, baby monitors, robot vacuums, smart locks and smart plugs, ranked by risk.

Smart Vertical Video Reframer

Reframe landscape footage into 9:16 vertical video that follows the subject.

Smart-Meter Interval Analyzer

Find demand peaks and time-of-use savings in your smart meter CSV export.

Smoke Alarm Placement Planner

Count the smoke and CO alarms a home needs under NFPA 72 and get the mounting distances for ceilings, walls and peaks.

Snake Draft Board

Run a snake draft with serpentine pick order and live selection tracking.

Snake Game

Play a responsive Snake game with speed levels, collision detection, touch controls, and score statistics.

Snake Water Gun Game

Play Snake Water Gun against the computer — pick your move, see who wins, and track your score across rounds.

Sobriety Recovery Journal

Privately track sober days, urges, triggers and the coping wins in between.

Social Alt Text Writer

Draft and score alt text for social images against platform character limits and the 125-character screen reader guideline.

Social Battery Tracker

Log social events and alone time for the week, see the battery level left, the heaviest day and the recovery hours you still owe yourself.

Social Engineering Safety Guide

Checklists and explainers for ATM skimmers, public Wi-Fi, hotel room tech, coworking spaces, juice jacking, tailgating, WhatsApp group admin scams and callback verification.

Social Graphic Generator

Make social media graphics for quotes, customer testimonials, coupon offers, stat cards and announcements, and download them as images.

Social Media Image Size Generator

Exact image sizes and resize presets for YouTube thumbnails, Instagram posts, Facebook covers, X, LinkedIn, Pinterest, WhatsApp status, Threads, Reddit, Discord, Twitch and Snapchat.

Social Media Simulator

Simulate social media feeds and posts to preview their visual appearance and layouts in real-time.

Society Maintenance Split Calculator

Split a housing society's monthly maintenance budget across flats by carpet area, equally, or on a hybrid basis.

Solar & Lunar Eclipse Simulator

Interactive celestial optics simulator for Solar and Lunar eclipses with Umbra and Penumbra shadow cone geometry.

Solar Panel Area Calculator

Find the panel count, module efficiency and roof area needed for a target solar capacity, plus expected daily generation.

Solar Panel Cleaning Planner

Plan solar panel cleaning frequency from dust level, tilt and rainfall, with the yield lost and the cost-optimal interval.

Solar Panel Output Estimator

A practical electronics tool for managing solar panel output workflows efficiently.

Solar Self-Consumption Optimizer

Find the best appliance timing from your solar generation and usage CSV exports.

Solar System Explorer

Interactive 2.5D solar system planetarium with real orbital periods, planetary scale toggles, and astronomical data cards.

Solar Water Heater Size Calculator

Size a solar water heater in litres per day from family size and bathing habits, with collector area and yearly savings.

Sort Lines Tool

Sort lines alphabetically, ascending or descending.

Sorting Algorithm Animation

Watch sorting algorithms in action with animated bar chart visualizations. Compare Bubble Sort, Quick Sort, Merge Sort, Insertion Sort, Selection Sort, and Heap Sort.

Sound Decibel Checker

Measure real-time sound levels instantly with accurate decibel detection.

Sound To Color Synesthesia

Visualize live audio, microphone input, or uploaded songs as responsive color, frequency, and waveform art.

Source Map Strategy Chooser

Compare webpack devtool source map types on build speed, rebuild speed, debug accuracy and production safety.

South Indian Breakfast Calorie Tool

Add up calories and macros for idli, dosa, vada, upma, pongal, sambar, chutney and filter coffee.

Souvenir Price Fairness Checker

Check a quoted souvenir price against the local prices you recorded, with markup, counter-offer and walk-away figures.

Space Rocks

Blast drifting space rocks in this free retro arcade shooter with inertia physics and waves.

Spacing Scale Generator

Build a linear or modular spacing scale snapped to a 4 or 8 point grid, with rem values, named tokens and ready-to-paste CSS.

Spam Checker

Detect spam content instantly using intelligent pattern analysis.

Spark Plug Gap Tool

Convert spark plug gaps between mm, inches and thou, and check a measured gap against the typical range for your engine.

Speaker Test

Test speakers and headphones online: left/right channel check, stereo panning, 20 Hz to 20 kHz sweep, bass tones and phase test with a volume cap.

Speech Timing Calculator

Convert a word count into speaking minutes at your delivery pace, with slide and pause overhead and a word budget for any target length.

Speed Distance Time Calculator

Enter distance and time to get speed, with m/s and mph conversions.

Speed-Date Rotation Planner

Build a non-repeating round-robin meeting schedule for a speed dating event.

Spelling Checker

Check and correct spelling mistakes instantly with smart suggestions.

Spin the Bottle

Classic spin the bottle game with realistic physics animation, multiple bottle designs, and sound effects.

Spirit Animal Finder

Discover your spirit animal through personality questions and find your deep connection with nature.

Spirograph Generator

Generate customizable spirograph patterns and export them as PNG.

Split CSV

Split a CSV file into smaller CSV files by rows per file, by an equal number of files, or one file per column value — in your browser.

Split Excel

Split an Excel workbook into separate files — one per worksheet, by rows per file, into equal parts, or one file per column value.

Sponsored Disclosure Label Generator

Generate clear paid-partnership disclosures per platform, with placement rules from the FTC, ASA and ASCI guidance.

Sponsored Disclosure Placement Checker

Test a sponsored disclosure's contrast, size, on-screen duration and placement.

Sports Current Affairs Tracker

Log tournaments, winners, runners-up and venues in a searchable exam-ready table for sports current affairs questions.

Spotify Playlist Cover Maker

Design square playlist covers with auto-fitting type, WCAG contrast checking and exports at Spotify's 640-3000 px specs.

Sprint Capacity Calculator

Compute real sprint capacity in person-days and hours from headcount, leaves, holidays and ceremony or support overhead.

Sprint Goal Generator

Create focused sprint goals with measurable outcomes, scope notes, risks, and review prompts for agile planning.

Sprite Animation Timing Calculator

Frame duration, sheet dimensions, refresh-rate alignment and ready-made CSS steps() keyframes for sprite sheet animation.

Sqft to Sqm Converter

Convert square feet, square metres, square yards, acres and hectares, with rate per unit and total plot cost.

SQL Formatter

Format SQL queries with readable line breaks, configurable indentation and keyword case — entirely in your browser.

SQL JOIN Fan-Out Debugger

Find out why your SUM is too high after a join: describe each table's grain and key cardinality to get the row-multiplication factor, which aggregates are inflated, and the corrected SQL.

SQL WHERE Builder

Build a SQL WHERE clause from plain conditions with correct identifier quoting, string escaping and parameter placeholders for MySQL, PostgreSQL, SQL Server, SQLite and Oracle.

SQLite Query Formatter

Format SQLite SQL with clause-aligned line breaks, keyword casing and full support for PRAGMA statements and SQLite quoting.

Square Root Calculator

Find square, cube and nth roots to 50 decimal places, simplify radicals like √72 = 6√2, check perfect squares and see each step of the working.

SRT To Plain Transcript

Strip timecodes and caption markup from an SRT file to get a clean, paragraphed transcript with word count and speaking rate.

SRT To VTT Converter

Convert SubRip (.srt) subtitles to WebVTT in the browser, with timing offset, alignment tag conversion and BOM/line-ending cleanup.

SSC OMR Practice Sheet

Print an SSC-style OMR answer sheet with A-D bubbles, CGL/CHSL Tier-I part blocks, marking scheme and a roll number grid for practice.

SSH Key Type Chooser

Compare Ed25519, ECDSA and RSA SSH keys on security strength, size and OpenSSH support, then copy the exact ssh-keygen command.

SSL Certificate Inspector Studio

Paste a PEM certificate or chain to decode its X.509 fields, check expiry and hostname matching, and validate chain order — entirely in your browser.

Stair Climbing Tracker

Log stair steps climbed and get elevation gain, Fitbit-style floor count and calorie burn from vertical work.

Staking Reward Calculator

Project crypto staking rewards from an APR, with validator commission deducted and rewards compounded at your payout frequency.

Stamp Paper Denomination Splitter

Work out the fewest non-judicial stamp papers that add up to a required stamp duty amount, plus any unavoidable excess.

Standard Deduction Impact Calculator

See how the salaried standard deduction lowers your taxable income and final tax in the old and new regimes.

Standard Deviation Calculator

Population or sample standard deviation, variance and mean.

Standing Instruction Cancellation Letter

Draft a mandate or auto-debit cancellation letter and check you are lodging it enough working days before the next debit.

Standup Notes Generator

Turn rough bullets for yesterday, today and blockers into a tidy daily-scrum update formatted for Slack, Markdown, Jira or plain text.

Star Life Cycle Explorer

Interactive stellar evolution explorer charting stellar birth, main sequence hydrostatic equilibrium, nucleosynthesis, and stellar remnants.

Startup Name Generator

Advanced AI-powered naming generator and professional branding suite. Discover names, slogans, dynamic logo mockups, and color palettes.

Startup Runway and Burn Rate Calculator

Model gross burn, net burn and months of runway with revenue and cost growth, plus break-even month, burn multiple and funding gap.

Static Site Generator Comparison

Compare Next.js, Astro, Hugo, Eleventy, Gatsby, SvelteKit and Jekyll on build speed, client JS, rendering modes and ecosystem.

Steel Rebar Weight Calculator

Rebar weight in kg from bar diameter, length and count, with the d²/162 unit weight, stock bars and cost.

Step Counter

Free online step counter and pedometer: your phone's motion sensor counts steps, with a daily goal, distance, calories and history. No app.

Step Goal By Age Calculator

Set a daily step target from the evidence bands for your age and goal, with a 10%-a-week ramp from the steps you take now.

Step-Up SIP Calculator

See how raising your SIP a little every year grows your corpus — exact month-by-month math against a flat SIP.

Steps to Calories Converter

Convert steps into calories and distance using your height for step length and MET values from the Compendium of Physical Activities.

Steps to Kilometres Converter

Convert steps to kilometres and miles using a step length from your height, your own measurement, or a known stride.

Stock Average & Break-Even Calculator

Find your true average buy price, live P&L, and break-even, plus a planner for averaging down the smart way.

Stock Photo Attribution Generator

Build correct credit lines for stock and Creative Commons images in plain text, HTML and Markdown using the TASL rule.

Stop Loss and Target Calculator

Stop loss and target prices from your entry price and risk-reward ratio, for long or short trades, with per-trade risk and reward amounts.

STOP-BANG Sleep Apnoea Score

Eight yes/no items on snoring, tiredness, blood pressure, BMI, age, neck size and sex give a STOP-BANG score out of 8.

Stopword Impact Tester

Strip stopwords and filler words to see the change in word count, characters and estimated tokens — and what meaning it costs.

Storage Unit Size Selector

Add up what you plan to store and get the smallest self-storage unit that fits, allowing for sprinkler clearance and access.

Story Point Estimation Calculator

Convert story points to hours from your team's own velocity, with a confidence range and sprint forecast.

Story Prompt Generator by Genre

Generate story prompts filtered by genre, tone, setting and character type, each with a want, an obstacle, a twist and a word target.

Storyboard Builder

Sequence shots, plan scene durations with running SMPTE timecode, check dialogue length, and export a production sheet or CSV.

Storyboard Frame Sheet Generator

Lay out printable storyboard sheets at your shooting ratio, with notes columns, page fit checks and an SVG you can print.

Streak Tracker

Keep a daily streak for study sessions, runs or language practice, saved on your device.

Stream BRB Screen Maker

Design a be-right-back stream scene with countdown, message and brand colours, with live WCAG contrast checking and SVG or PNG export.

Stream Deck Icon Generator

Generate consistent square control-surface key icons with labels, exported as SVG or PNG with a WCAG contrast check.

Stream Overlay Size Calculator

Work out facecam, alert and chat overlay pixel sizes and safe-area positions for any stream canvas and output resolution.

Stream Scene Layout Planner

Plan camera, gameplay and chat placement on a 1920x1080 scene and get exact OBS transform coordinates for every source.

Stream Settings Calculator

Calculate stream settings values quickly with a simple, structured workflow.

Stream Time Zone Converter

Convert one stream start time into local times across your audience time zones, with day shifts and prime-time flags.

Streaming Bandwidth Calculator

Estimate the upload speed a live stream needs from video and audio bitrate, protocol overhead and safety headroom.

Streaming Data Usage Calculator

Estimate the mobile data an hour of audio or video streaming uses, and how long a data allowance will last at that quality.

Street Food Budget Planner

Plan a trip food budget across street stalls, cafés, snacks and splurge meals, and see how many nice meals your budget really allows.

Stretch Routine Timer

Guided stretch timers for neck and shoulders, wrists, and physio exercises with rep and hold counts.

Stride Length Calculator

Work out running step and stride length from cadence and pace, or from a step count over a known distance.

Strikethrough Text Generator

Add copy-paste Unicode strikethrough marks to text for posts, bios and messages.

String Escape Tool

Escape a string for JSON/code (quotes, backslashes, newlines) or unescape it.

Stroop Effect Test

Test your cognitive control — name the color, not the word. Measure your Stroop Effect and reaction time in this classic psychology experiment.

Student Loan Calculator

Calculate a student loan's monthly payment, capitalised interest, total cost and the savings from paying extra each month.

Study & Teaching Prompt Builder

Build AI prompts for JEE doubts, NEET and SSC study, UPSC answer writing, study plans, flashcards, quizzes, lesson plans, rubrics, essay feedback, viva questions and thesis outlines.

Study Background Noise Player

Loopable white, pink and brown noise generated in your browser, with a session timer and a gradual volume ramp.

Study Environment Score

Rate noise, lighting, desk setup, phone placement and more to get a weighted 0-100 score for your study environment.

Study Lighting Calculator

Lumen-method study desk lighting: target lux, room index, luminaire count, spacing grid and the desk lamp top-up needed.

Study Material Version Tracker

Track which edition of each textbook or module you are using against the latest edition, and see what is out of date.

Study Room Planner

Size the desk, chair clearance, shelving and lighting for a study room from its floor dimensions.

Study Timetable Planner

Create smart study schedules with auto-balancing, productivity tracking, and analytics.

Subject Strength Radar

Turn subject-wise marks into a radar chart with strongest and weakest subjects and a balance score across all of them.

Subnet Calculator

Works out the network address, broadcast address, usable host range and host count for any IPv4 address written in CIDR or netmask form.

Subresource Integrity Generator

Generate SHA-256, SHA-384 and SHA-512 integrity attributes for scripts and stylesheets, hashed locally in your browser.

Subscript Generator

Convert text into Unicode subscript characters for chemistry formulas, math notation, and typographic flair.

Subscription Cost Tracker

Track all subscriptions with monthly and yearly cost totals, renewals, categories, and savings insights.

Subscription Spend Audit Tool

Normalise every recurring subscription to a yearly cost, see the true annual drain and what cancelling the dead ones saves.

Subscription Wind-Down Planner

List recurring subscriptions, project what they cost if nobody cancels, and record where each one can be stopped.

Subtitle Timing Adjuster

Shift, scale, and correct subtitle timings with range targeting, QA checks, and export-ready SRT output.

Subtitle UTF8 BOM Fixer

Add or strip the UTF-8 byte order mark on SRT and WebVTT subtitles, fix line endings and spot mojibake before upload.

Sudoku — Daily Puzzle & Unlimited

Play a shared daily sudoku or unlimited puzzles with notes, hints, streaks, and four difficulty levels.

Sudoku Solver

Solve any Sudoku instantly or step-by-step with technique explanations. Generate new puzzles with unique solutions across four difficulty levels.

Sugar Swap Calculator

Convert any sweetener to an equally sweet amount of another, with calories saved, glycaemic index, ADI use and baking notes.

Sukanya Samriddhi Yojana Calculator

Project your daughter's Sukanya Samriddhi maturity with real scheme rules — 15 years of deposits, 21-year maturity, year-wise growth.

Summary Length Planner

Turn a source word count and a compression ratio into a target length, sentence count, token budget and reading time saved.

Summits And Reports Tracker

Track international summits, indices and reports with host, publisher, year and India's rank in one exam-ready table.

Sunny 16 Exposure Helper

Get manual aperture and shutter settings from the lighting condition and ISO using the Sunny 16 rule and the EV = log2(N²/t) formula.

Sunscreen Reapplication Calculator

How much sunscreen to apply by body area and when to reapply, from the UV index, your skin type and water resistance.

Sunscreen Reapply Timer

Build a clock-time sunscreen reapplication schedule sized to your activity, sweat and water exposure, plus how much to use each time.

Sunset Viewpoint Timing Planner

Work out when to leave to reach a viewpoint before golden hour, using NOAA solar equations for the light and Naismith's rule for the climb.

Super Built-Up Loading Decoder

Restate two flats quoted on different area bases onto one RERA carpet-area basis and compare the real price per square foot of carpet.

Superpower Generator

Generate your unique superhero persona, complete with a primary superpower, a funny weakness, and a dramatic origin story.

Superscript Generator

Convert supported characters into Unicode superscript for math, footnotes, and social posts.

Surface Area Calculator

Calculate total, lateral and base surface area of a cube, box, cylinder, cone, sphere, pyramid, prism or pipe, with formulas, steps, units and paint needed.

Surface Vibration Recorder

Build a vibration timeline for any surface from your device's accelerometer.

Surname Change After Marriage Checklist

Phase-by-phase checklist for changing a surname after marriage, with the documents to carry and how many office visits are left.

Survey Builder

Create custom surveys easily with interactive drag-and-drop fields.

Surya Namaskar Counter

Count Surya Namaskar rounds with breath pacing, session time, MET-based calories and a daily practice streak.

Suspension Wear Checklist

Tick the noises and symptoms your car shows and get a ranked list of the suspension parts most likely responsible.

SVG Arrow Generator

Draw straight or curved annotation arrows on a quadratic Bezier path and export clean, editable SVG markup.

SVG Blob Generator

Create organic SVG shapes with random seed generators. Export clean SVG code or CSS inline strings.

SVG Optimizer

Shrinks an SVG file by removing editor metadata, comments and default attributes and by rounding coordinate precision, without changing how it renders.

SVG Path Editor

Parses an SVG path d attribute into editable commands, converts between relative and absolute form, moves and scales it, and previews the result live.

SVG to Image

Rasterise SVG markup to a downloadable PNG, JPEG or WebP at any scale, entirely in your browser.

Sweat Rate Calculator

Find your hourly sweat rate from the weigh-in weigh-out method, plus fluid replacement and sodium loss estimates.

Swim Stroke Count Tracker

Log strokes per length and see average, spread, distance per stroke and how much your count drifts as you tire.

Swiss Pairing Engine

Build Swiss tournament pairings from current scores while avoiding rematches.

Switch-Scanning Communicator

Select and speak phrases using single-switch scanning input.

SWOLF Score Calculator

Add length time and stroke count into a SWOLF efficiency score, normalised per 25 m, with the speed and stroke trade-off.

SWOT Analysis Maker

Builds a four-quadrant SWOT grid from your own lists, checks it for balance, and derives the four TOWS strategy pairings you can copy out as Markdown.

SWP Calculator

Plan systematic withdrawals with corpus life, step-up withdrawals, return scenarios, and tax estimates.

Syllable Counter

Counts the syllables in a word, a line or a whole passage of English, and reports the per-line counts plus Flesch readability scores.

Syllabus Tracker

Track chapter-wise progress through the CBSE Class 10 and Class 12 syllabus and the CLAT syllabus, saved on your device.

Symptom Checker

Check your symptoms and get an initial health assessment and recommendation.

Symptom Diary

Log symptoms, monitor severity, and detect health patterns

Synonym Finder

Find synonyms and antonyms for any English word. Browse 200+ headwords with detailed synonym lists, part-of-speech tags, and example sentences.

System Prompt Builder

Build a clear system prompt for ChatGPT, Claude or Gemini: pick a role such as coding assistant, editor, HR recruiter, product manager or kids tutor and fill in the details.