Subject line tester
Check a cold email subject line before you send.
Test for readable length, clear intent, useful personalization, real urgency, and common spam-trigger phrases.
Keep it clear
One subject line, one quick risk review.
The tester gives a practical quality signal before you move to the full email and deliverability checks.
6
checks
250ms
local review
0
delivery guarantees
Test your subject line
Paste one subject line. Keep the analysis simple and revise until the subject line sets a clear expectation.
What the tester checks
A good cold email subject line should be easy to scan, specific to the message, honest about urgency, and free of obvious spam-trigger phrases.
Length and mobile readability
Specificity and recipient context
Urgency and spam-trigger risk
Match the email body
The subject line should promise exactly what the message delivers.
Avoid fake urgency
Deadlines and limited-time language should only appear when true.
Check the full message
The subject line is one signal. The email body still needs a spam and deliverability review.
Next step
Turn the subject into a clearer cold email.
Use the generator for the message, then run the full copy through the spam score checker before sending.
What does the score mean?
It is a practical quality check, not a delivery guarantee. Use it to spot length, clarity, personalization, urgency, and spam-trigger issues.
Should every subject line use urgency?
No. Urgency only helps when it is true. Fake urgency can hurt trust and can look like a spam signal.
What should I do after this?
Run the full message through the spam checker, then generate or revise the email with the same clear offer and audience.