Tools starting with R
130 free online tools on AltFTool start with R, listed alphabetically. Every one is free, needs no sign-up and runs in your browser.
Build amqp:// and amqps:// connection URIs with vhost, heartbeat and connection timeout parameters, encoded per the RabbitMQ URI spec.
DeveloperCalculate a sample's remaining quantity, activity, or age from its half-life and elapsed time.
Education & ScienceCheck locally whether answer claims carry recognizable citations to the supplied retrieval set, without claiming that a source proves the claim.
AI ToolsReview text-based RAG files locally for prompt-injection, hidden-content, suspicious-link, and duplicate signals before indexing.
Security & PrivacyWork out the real chance of losing an outdoor day to rain, then assign indoor alternatives and suggest day swaps that cut the risk.
LifestyleWork out soil, compost, cocopeat and perlite volume to fill raised garden beds, with settling allowance and block counts.
CalculatorsPick a random playing card with a 3D flip animation.
GamesGenerate random colours in HEX, RGB and HSL — pastel, vivid, dark, warm, cool, grey or a custom hue range — lock favourites and export CSS, JSON or PNG.
Design & ColorAsk a yes/no question.
FunGenerate a random joke, quote, life challenge, emoji combo, fun pick, business idea or startup idea with one tap.
FunPick random letters A–Z, vowels or consonants, or Hindi, Greek and Russian letters, with exclusions, no repeats, history and a timer for letter games.
GeneratorsGenerate random full names — first and last names — for characters, usernames, writing prompts, or creative projects.
FunAdd names, eliminate duplicates, and pick a random winner with animated selection. Supports elimination mode and winner history.
ProductivityGenerate unbiased random numbers in any range, integers or decimals, with no-duplicate draws, exclusions, odd/even and prime filters, history and CSV export.
GeneratorsGenerate dramatic villain names and identities with evil titles, dark abilities, and catchphrases. Perfect for stories, games, and roleplay.
FunGenerate a batch of random English words for games, prompts and brainstorming.
FunTabulate ranked-choice voting with every instant-runoff round shown.
ProductivityFind your rashi instantly based on date of birth.
LifestyleInteractive chart of the naming syllables traditionally linked to each of the twelve rashis, with the nakshatra padas each syllable comes from.
Education & ScienceSimplify ratios, solve for a missing term and split a total in any given ratio.
CalculatorsRation Card Category Explainer
Compare AAY, Priority Household and non-NFSA ration cards — monthly grain entitlement, issue prices and what the ration is worth.
Education & SciencePreview RAW photos with a simple exposure control, then export to JPEG.
Image & VideoGenerate zebra stripes and natural biological morphogenesis patterns with an interactive Gray-Scott reaction-diffusion simulator.
FunMeasure and track your reaction time with interactive tests and progress tracking.
FunMeasure your reaction time in milliseconds with a simple click test. Track attempts, see your stats, and compare your score.
FunAnalyze text readability with Flesch-Kincaid, Gunning Fog, SMOG, and Coleman-Liau scores. Optimize your writing for any audience.
Text & WritingMeasure your text's Flesch-Kincaid grade and build a rewrite prompt targeting a specific grade or reading level.
Education & ScienceMeasure your reading speed and words per minute with a timed reading test using built-in passages.
Education & ScienceEstimate reading time, word count, sentence count, and readability metrics for any text in real time.
Education & ScienceGenerate clean, professional README files for projects instantly.
DeveloperBuild any recipe from real ingredient data and see calories, protein, carbs, fat and fibre per serving.
Health & FitnessRecipe Scaler & Serving Converter
Scale any recipe up or down by servings or pan size, with fraction-friendly amounts and smart tips for salt, spice, and leavening.
LifestylePlan where to keep 2FA backup codes across offline, encrypted and off-site copies, and see which resilience rules your plan fails.
Security & PrivacyRecurring Deposit Maturity Calculator
Bank RD maturity value with quarterly compounding, year-wise interest accrual, section 194A TDS and a post-tax view.
Finance & BusinessInspect redacted PDFs and images locally for exposed text, risky annotations, metadata, and visual warning signs before sharing.
Security & PrivacyBuild redis:// and rediss:// URLs with database index, ACL username, password and TLS — plus the matching redis-cli command.
DeveloperMeasure facial redness from a photo in CIELAB a*, cheek by cheek, against the calmest skin in the same frame. Colour measurement only, run entirely in your browser.
LifestylePlan the audio for every reel or short, check whether each track clears organic and paid use, and track licence records.
Marketing & SocialFind the perfect trending background music for your Reels and TikToks.
Marketing & SocialDraft first-three-second Reels hooks with a spoken word budget, timed beat sheet and on-screen text safe-zone cues.
Text & WritingWork out calorie, protein, fat and carbohydrate targets for a planned refeed day, plus what it costs your weekly deficit.
Health & FitnessCompare all eight Referrer-Policy values on a real URL pair and see the exact Referer header each one sends.
DeveloperCheck your monitor's refresh rate in Hz online, with frame-time graph, jitter and dropped-frame counter, plus a motion test for ghosting and frame skips.
ProductivityGenerate a refund and cancellation policy for an online store, digital products, events, memberships or a restaurant, ready to paste on your site.
Finance & BusinessWrite a firm, polite refund request with order facts, the days elapsed, a reply deadline and the escalation route.
Text & WritingBuild a printable regex cheatsheet filtered to your flavor — JavaScript, PCRE or Python — and only the feature groups you use.
DeveloperCopy tested regular expressions for email, phone numbers, URLs, dates, password rules, card number formats and Indian documents like PAN, Aadhaar and GSTIN, and test them live.
DeveloperPreview regex find-and-replace results with $1, $&, $<name> capture references and per-match breakdown before touching real data.
DeveloperTest and validate regular expressions instantly with live results.
DeveloperGet practical relationship prompts, communication tips, and supportive advice for common situations.
LifestyleRelease Train Schedule Planner
Plan fixed-cadence release dates with code freeze, release candidate and GA milestones, weekend-safe.
ProductivityMonitor new releases across the GitHub projects you choose to follow.
DeveloperCollapse multiple spaces and trim each line down to single spacing.
Text & WritingRent Increase and Escalation Calculator
Project rent across a lease term with periodic escalation, and see the total outgo, final rent and true annual rate.
Finance & BusinessWrite a rent increase notice or a rent agreement renewal notice for a tenant, with dates and terms filled in.
Finance & BusinessGenerate monthly rent receipts for HRA claims with amount in words, landlord PAN rules and revenue stamp guidance.
GeneratorsCompare renting vs buying a home in India — EMI, appreciation, invested savings, and a clear verdict for your horizon.
Finance & BusinessRental Agreement Cost Calculator
Estimate stamp duty, registration fee, brokerage and GST on a rent agreement, with state formulas and your share of the total.
Finance & BusinessCalculate gross and net rental yield, annual income, expenses, ROI, cash flow, and break-even for rental properties.
Finance & BusinessScore a rental move-in against a weighted, code-referenced security and safety checklist.
LifestyleCompare repair quotes on parts, labour, warranty and what each one excludes.
LifestyleRepair Request Letter to Landlord
Log pending repairs, split them between landlord and tenant duties, set a deadline and generate a documented request letter.
Finance & BusinessBuild a pip requirements.txt with pinned versions, extras and environment markers, validated against PEP 508 and PEP 440 rules.
GeneratorsEstimate a fair second-hand price for a smartphone, laptop, home appliance or furniture from age, condition and original price.
Finance & BusinessReserved Instance Break-Even Calculator
Find how many months of uptime make a 1 or 3 year cloud reservation cheaper than paying the on-demand rate.
CalculatorsCompare last working days in rupees: gratuity eligibility under the Payment of Gratuity Act 1972, notice buyout, leave encashment, bonus clawback dates and the financial year the payout lands in.
Finance & BusinessDraft a resignation letter with the last working day calculated from your notice period, plus handover details and a notice-shortfall check.
Text & WritingResignation Letter Generator by Notice Period
Work out your last working day from the notice period, leave adjustment and buyout days, then generate a resignation letter with a dated handover plan.
Finance & BusinessRestaurant Phrasebook Generator
Build a restaurant phrasebook in eight languages with ordering, dietary, allergy and payment phrases, script and romanisation.
Education & ScienceResting Heart Rate Trend Tracker
Log morning resting heart rate and see rolling averages, baseline deviation and a weekly trend line.
Health & FitnessResult Date Expectation Tracker
Project a realistic result window for your exam from how long past cycles took between exam and result.
ProductivityCreate a professional resume
Finance & BusinessAnonymize resumes locally for blind hiring by replacing names, contact details, addresses, dates of birth, links, handles, and identifiers.
Security & PrivacyFind the retirement corpus you need and the monthly SIP to get there, with inflation-adjusted math and a year-wise plan.
Finance & BusinessPlan your retirement corpus with inflation-adjusted goals, monthly savings targets, and year-by-year withdrawal projections.
Finance & BusinessBuild a spec-correct Retry-After header in delay-seconds or IMF-fixdate form, with an exponential backoff schedule for 429 and 503 responses.
DeveloperTrack shopping return windows, refund status, and deadlines with futuristic precision.
ProductivityReturn Window Policy Calculator
Set return windows by product category and compute the return, pickup and refund deadline dates for any order.
Finance & BusinessWeigh the re-check fee, the chance of a change and the deadline before applying for revaluation of an answer book.
Education & ScienceReview Site Personal Data Removal Guide
Build a dated, ordered plan to get your name, contact details or photos off review and rating platforms, with the right escalation route.
Security & PrivacyRevision Limit Contract Helper
Price your included revision rounds, see your real effective hourly rate, and draft the scope clause that ends endless changes.
Finance & BusinessReynolds Number & Pipe Flow Calculator
Calculate the Reynolds number, flow regime, and head loss for fluid flowing through a pipe.
Education & ScienceRice & Grain Water Ratio Guide
Exact water for any grain — basmati to millets — by pot, pressure cooker or rice cooker, with soak tips and yield.
LifestyleTime ice-on and ice-off cycles for a fresh soft-tissue injury, with a dated application schedule and compression and elevation checks.
Health & FitnessA beautiful, fully-featured WYSIWYG editor. Format text, add media, and export clean HTML instantly.
DeveloperSplit a shared cab fare fairly by the distance each passenger actually rode, segment by segment.
CalculatorsAllocate a riding gear budget in protection priority order, see body-coverage achieved, the shortfall and months to a full kit.
Finance & BusinessTest your knowledge of world rivers — identify rivers by length, location, continent, and facts with timed quizzes and scoring.
Education & ScienceRLC Resonance & Filter Calculator
Calculate the resonant frequency, Q factor, and cutoff frequency of a series or parallel RLC circuit.
CalculatorsRecord speed-normalized road jolts from your device's accelerometer and GPS.
DeveloperGenerate a packing and car-prep checklist with real quantities, tailored to trip length, travellers, season and terrain.
ProductivityCalculate Return on Ad Spend (ROAS), cost-to-revenue ratio, P&L, conversion funnel, and campaign scenarios.
Marketing & SocialGenerate hilarious and creative roasts for friends, enemies, or yourself. Choose from savage, playful, or witty styles.
FunCreate standard robots.txt files for search engines with interactive forms to configure crawling rules, delays, and sitemaps.
DeveloperPlay Rock Paper Scissors and Flip Coin in a premium game hub with smooth animations, live stats, streaks, and sound.
GamesReturn on investment as a percentage from the amount invested and the amount returned.
Finance & BusinessPractise bubbling roll number digit grids like a real OMR sheet — blanks, wrong digits and double marks are graded instantly.
Education & ScienceAverage, best and worst annualised returns across every overlapping window in a NAV or index series.
Finance & BusinessConvert numbers to Roman numerals and back with strict validation, place-value breakdowns, and symbol references.
Education & ScienceTrue sloped roof area from footprint, eaves overhang and pitch, plus rafter length, ridge, gutter run and sheet count.
CalculatorsPlan roof box volume and weight against your car's dynamic roof load limit, with packing efficiency and fuel penalty.
CalculatorsCheck dynamic roof load limits against rack plus cargo weight, with payload, rollover stability and fuel penalty.
CalculatorsRoof Water Collection Estimator
Rainwater harvested per storm and per year from roof plan area, rainfall, runoff coefficient and first-flush diversion.
CalculatorsRoom Color Temperature Selector
Pick the right light colour temperature, CRI and lumen output for each room and mood, with a live colour preview.
Design & ColorDew point, heat index, absolute humidity and comfort band from room temperature and relative humidity, with mould and condensation warnings.
CalculatorsBuild a 60-30-10 room palette from the mood you want and the direction your window faces, with LRV and contrast checks.
Design & ColorEstimate paint quantity, cost, coats, and shopping list for single or multiple rooms.
LifestyleRoom Rent Proportionate Deduction Calculator
See the rupees a health insurer deducts when the hospital room exceeds your room rent limit, and the sum insured a given room tariff needs.
Finance & BusinessLog decay and silence diagnostics from a clap or sweep recording — not a calibrated RT60 estimate.
Image & VideoSplit rent, utilities and deposit between flatmates and generate a written roommate agreement with chores, guest and exit rules.
Finance & BusinessBuild a structured register of your personal-data processing activities.
ProductivityEncodes or decodes text using the ROT13 substitution cipher, which shifts each letter by 13 positions in the alphabet.
Text & WritingFind the equivalent rice portion for your rotis (or the reverse) and compare calories, protein, carbs and fibre.
Health & FitnessRounding and Cash Denomination Calculator
Round an amount to a cash-friendly figure and split it into the fewest ₹ notes and coins for payouts and envelopes.
CalculatorsRound numbers to any place, decimal places, significant figures or nearest multiple, with half-up, banker's, floor, ceiling and truncate modes.
CalculatorsSecure your Wi-Fi router step by step: admin password, WPA3, WPS, remote admin, firmware and guest network settings for 11 router brands and Indian ISPs.
Security & PrivacyRoyalty Split Waterfall Calculator
Reconcile fees, recoupment and collaborator splits down to the exact cent.
Finance & BusinessCreate clean RTI application drafts with applicant details, PIO address, information points, fee mode, checklist, copy, and TXT export.
Finance & BusinessRTI Fee and Timeline Calculator
Work out RTI application and copying fees, BPL exemption, and the exact reply and appeal deadlines under the RTI Act 2005.
ProductivityPractise for your Indian learner's licence with 140+ real RTO-style questions, timed mock tests and instant explanations.
Education & ScienceRubik's Cube Algorithm Trainer
Learn and practice Rubik's Cube algorithms for PLL, OLL, F2L, and beginner methods with an animated cube-net visualization.
Education & SciencePick the right standard rug size for a living, dining or bedroom layout, with placement rules and the floor border left around it.
Design & ColorRule of 72 and Doubling Time Tool
Estimate how long money takes to double at any rate of return, and compare the Rule of 72 with the exact logarithmic answer.
Finance & BusinessEstimate how many years it takes for an investment to double at a given annual return rate, or find the required rate to double in a target number of years.
Finance & BusinessWork out your running cadence from a step count, see your step and stride length, and set a safe 5-10% progression target.
Health & FitnessCompare running costs: air cooler vs AC, split vs window AC, air fryer vs oven, induction vs LPG, PNG vs LPG, EV vs petrol or diesel, scooter vs bike, heat pump vs furnace and more.
CalculatorsTurn carpentry running feet quotes into square feet, compare per-rft and per-sqft rates, and total a kitchen or wardrobe job.
ConvertersWork out your pace per kilometre and speed from a distance and finish time.
Health & FitnessTrack mileage on every pair of running shoes, see percentage of life used and get replacement alerts before they wear out.
Health & FitnessAdd up a list of clip durations in mixed formats and see total runtime, average length and how it fits a target slot.
Calculators