Runs in your browser. Nothing you paste is sent anywhere.
Common questions
How long should a cold email be?
The playbook defaults to 50–90 words for a first email, because short emails are easier to read on a phone and to answer in one line. Treat it as a default, not a law.
What does the checker not check?
Whether the offer is any good, whether the list is right, and whether your domain is set up. Those matter more than length.
Is my email sent anywhere?
No. The check runs entirely in your browser.