Email Subject Line Analyzer
Check subject length, word count, capitalization, punctuation and promotional wording.
Check a subject line before you send
Get transparent diagnostics for length, words, capitalization, punctuation and potentially promotional wording—without a fake “AI deliverability score.”
What this analyzer actually checks
The analyzer reports simple, inspectable signals: character count, word count, capitalization, repeated punctuation and matches against a small visible-style list of promotional phrases. It does not claim to predict inbox placement or open rate.
How to improve a subject line
- Make the main benefit, question or context clear early.
- Remove filler words that do not help the recipient decide whether the message is relevant.
- Avoid excessive capitalization and punctuation.
- Match the promise in the subject with the email body.
- Test variants with your actual audience rather than treating generic benchmarks as universal rules.
Why there is no deliverability score
Inbox placement depends on sender reputation, authentication, complaint rates, engagement, list quality, content, provider filtering and other factors. A subject line alone cannot provide a scientifically valid deliverability percentage.
Promotional wording requires context
A word such as “free” is not automatically prohibited. The check simply flags wording worth reviewing for tone and accuracy; it is not a spam-filter simulator.