Score your subject line on deliverability, open-rate potential, and emotional impact. Get 5 improved variations instantly.
Enter a subject line and get a detailed breakdown with actionable improvements.
Enter any email subject line you want to test.
Scored across 6 dimensions: length, power words, spam risk, emotional appeal, clarity, and preview compatibility.
Get 5 auto-generated variations with scores — copy the best one.
47% of email recipients open emails based on the subject line alone.
Write 3-5 variations and pick the highest-scoring one before hitting send.
Different email clients truncate subject lines at different lengths.