Cold Email Subject Line Tester
Score subject lines on length, specificity, curiosity, and spam risk before you send to 500 prospects.
Free, no signup needed. Runs 100% in your browser.
Loading…
How to use this tool
- Type up to 3 subject variants.
- Compare scores and spam flags.
- Send the winner to a 50-prospect test batch.
Frequently asked questions
What subject lines get opened?
Short, specific, lowercase-feeling lines referencing the prospect world. Questions and numbers help. ALL CAPS, free, and guarantee hurt.
How is spam risk scored?
The tool flags classic trigger words and excessive punctuation that trip filters and human skepticism alike.
Should I personalize every subject?
Personalize the line, templatize the structure. One variable (company, trigger, role pain) beats clever every time.
Related tools
Say it out loud before the real call
Reading helps. Practicing against an AI buyer who pushes back is what builds muscle memory. Try it free.