What does this cold email checker score?
Each rule comes from published reply data, not taste:
- Subject line: 4 words and 40 characters at most, in lower case, and not naming what you sell.
- Length: 25 to 125 words. Below that it reads as a template; above it replies fall away.
- Sentences: none over 20 words, and a reading grade of 8 or lower.
- The ask: one question, and no request for a call in the first emails.
- Voice: no brochure words, no claims you cannot back up, no "I noticed" that says nothing, and your company named once, after the reader.
Why does the cold email checker care about the subject line so much?
The subject decides whether the email is opened at all. Three large datasets agree that subjects of one to four words get opened most, and Gong found salesy-looking subjects lose almost a fifth of opens. Our guide to cold email subject lines covers what to write instead.
Does a 10 out of 10 mean the cold email will get replies?
No. The checker catches what can be measured: length, readability, the ask, and the habits that cost replies. It cannot tell whether the offer matters to the reader, or whether the person on your list is the right one. Those decide most replies. Our guide on how to write a cold email covers both halves.
Should a cold email follow-up be scored differently?
Mostly the same rules apply. The difference is the last email: if it says it is the last one, it should not ask another question. Pick "The last email" above to check for that. Our cold email follow-up guide covers what each follow-up should say.