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free tool · ai-powered · subject lines in 10 seconds

Test your subject line.

Subject lines decide whether your email gets opened or ignored. Paste yours. Get a score, a diagnosis, and five sharper alternatives in under 10 seconds.

Required. Max 200 characters.
Helps Claude tailor the alternatives to your actual audience.
Max 1,500 characters. The more context, the better the alternatives.
One free test per email. We don’t share your address.

We use Claude (Haiku 4.5) to score and rewrite. Results are opinions. Real open-rate lift requires A/B testing.

Scoring your subject line
the score
-- / 100
clarity
-- /10
curiosity
-- /10
specificity
-- /10
length
-- /10
the diagnosis

five alternatives

Try these instead.

your next move

Want full cold outbound built and managed?

A good subject line is the start. We build and run the entire outbound sequence, from list to close.

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