Email Subject Line Tester
Test and score email subject lines for length, spam triggers, personalization, urgency, and predicted open rates.
Embed this tool52 characters · 9 words
Subject Line Score
57
Predicted Open Rate
12-18%
Spam Check
Clean
Urgency
No
Curiosity
No
Personalization
Yes
Emoji
No
Length
52 chars
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Email Subject Line Best Practices
Your subject line is the gatekeeper of your email. A strong subject line determines whether your message gets opened or ignored. Here are proven strategies to improve open rates.
Subject Line Formulas That Work
- Question: "Are you making this SEO mistake?"
- How-to: "How to [Achieve Result] in [Timeframe]"
- Personal: "[Name], your exclusive offer expires tonight"
- Urgency: "Last chance: 50% off ends at midnight"
- Curiosity: "The one trick top marketers don't share"
Frequently Asked Questions
The ideal length is 30-50 characters or about 5-8 words. This ensures the full subject is visible on both desktop and mobile devices, maximizing open rates.
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