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About this tool
Predict how likely your email is to reach the inbox with a rule-based content audit — spam signals, subject quality, link safety, HTML structure and best practices, scored entirely in your browser.
Email Deliverability Predictor audits your email content before you send it — subject quality, spam-trigger language, link safety, HTML structure and compliance best practices — and turns the findings into a weighted 0-100 score with an estimated inbox probability. Every check is a fixed, documented rule that runs locally in your browser; it's a content-based prediction, not a measurement of real inbox placement, so pair it with SPF/DKIM/DMARC and seed-list testing before a real campaign.
Open Email Deliverability Predictor on AltFTool — it loads instantly in your browser.
Paste your subject line and email content (plain text or HTML source).
Optionally add the sender address for extra checks like no-reply and free-domain warnings.
Click Analyze — or turn on auto-analyze to re-score as you edit.
Work through the issues and recommendations, then copy or download the report.
Subject, content quality, links, HTML structure and best practices are scored separately, so you can see exactly which area drags the overall number down.
The inbox probability is capped and clearly labeled an estimate — the tool never pretends content analysis can see your sender reputation or DNS authentication.
Every issue explains why it matters and how to fix it, and flagged spam phrases come with safer alternatives you can copy.
Analysis runs in your browser with no upload; history lives only in local storage.
No. It runs a deterministic, rule-based audit of your content and derives an estimate. Actual placement also depends on sender reputation and SPF/DKIM/DMARC authentication, which no content checker can see.
It's a weighted blend of the overall content score and the spam-risk score, capped at 97% because content analysis alone can never guarantee delivery. Treat it as directional, not a promise.
Spam filters score combinations of signals, not single words. Each flagged phrase contributes a little risk — the tool shows them all so you can decide which are worth rewording, and suggests neutral alternatives.
No. Every check runs locally in your browser via fixed JavaScript rules, and your history is stored only in this browser's local storage.
