Subject Line Analyzer
Score—
Length—
Spam Risk—
Sentiment—
Mobile preview
Desktop preview
Tip: avoid spammy words and excessive punctuation. Ideal subject line length is 20–45 characters.
How to use
Enter your subject line above and click Analyze. The tool checks for spam triggers, length, capitalization, and gives suggestions to improve open rates.
Why use this?
Improve inbox placement and increase open rates with subject lines that avoid spam filters and resonate with readers.