Email subject line tester
Write better subject lines before you hit send.
Check character count, word count, mobile cut-off, spam-trigger words, and get a simple score with tips that help you improve fast.
Subject line checker
Type your subject line below and watch the results update instantly.
Mobile preview
Cuts off after 38 characters
Inbox
Now
Your subject line preview will appear here
Quick preview text that usually follows the subject line in mobile inboxes.