Email subject comparer

Compare subject lines by character length, word count and a transparent clarity heuristic. Shortlist email subjects before sending by making length, front-loaded meaning and avoidable clutter easier to see.

3 guest runs per rolling 24 hours10 with a free accountPrivate inputsMobile-friendly

Email subject comparer workspace

Runs locally in your browser

The score checks readability and obvious length issues; it does not predict opens, delivery or recipient behaviour.

Result

Strongest heuristic result—

Subjects compared—

Subject-line comparison

Use it with confidence

How to use the email subject comparer.

Add the requested inputs

Use the labelled fields in the workspace above. If example values are provided, try them first or replace them with your own.

Calculate and review

Use the main action when needed. Each line receives visible checks for length, words, punctuation, specificity and common filler rather than a promise of open-rate prediction.

Try a worked example

Paste one subject per line and compare a specific benefit-led subject with a vague or punctuation-heavy option.

Check the assumptions

No subject-line score can predict inbox placement or reader behaviour. Audience, sender reputation and relevance matter more.

Helpful answers