Free Email Subject Line Tester
Type a subject line to get an instant score. Nothing is sent or saved — it runs in your browser.
Score
0/100
0 characters
0 words
What makes a good subject line?
Keep it short (20–60 characters), specific and personal. Avoid all-caps, piles of exclamation marks and classic spam phrases like "act now" or "free money" — they hurt both trust and inbox placement.
See if it actually got opened
A score is a guess. Track My Mails shows the real answer: ✓✓ ticks in Gmail when your email is opened, with no watermark on any plan.