What the checker flags
False urgency (act now, last chance), money talk (free, discount), hype (guaranteed, revolutionary), offers that sound too good to be true (no risk, no strings attached) and pushy calls to action (click here, buy now).
And habits: words in capitals, more than one exclamation mark, repeated punctuation, more than one link, and a first email much longer than about 100 words.
What matters more than words
Your domain's set-up (SPF, DKIM, DMARC), your sending volume, and whether people reply. A short, specific email to the right person at the right moment beats any word list.
Questions
Is there an official list of spam words?
No: filters do not publish one, and they weigh many signals together. This list is a reading aid for words commonly flagged, not a filter's verdict.
Can I write "free" in a cold email?
Once, in context, it is unlikely to sink an email on its own. In a subject line or repeated, it reads like a promotion: say what is included instead.
Is my text sent anywhere?
No. The check runs in your browser as you type; nothing is sent or kept.
How long should a cold email be?
Short: a first email that reads in under 30 seconds, about 100 words or fewer, with one clear question.
Where Coolie comes in
For the leads you pick, Coolie writes the messages from the signal each lead was found on and the research on its company, and you approve each one before it goes, or let the agent run on autopilot: personalized email and LinkedIn outreach.