Email Subject Line Tester
Score email subject lines for open rate potential. Analyze length, spam triggers, personalization, and urgency.
Frequently Asked Questions
What is the ideal email subject line length?▼
The ideal email subject line is 30-50 characters (4-7 words). On mobile, subject lines are truncated around 35 characters. Keep your most important words at the beginning.
What words trigger spam filters?▼
Common spam triggers include "free", "buy now", "act now", "limited time offer", excessive capitalization, multiple exclamation marks, and dollar amounts. Avoid these to improve deliverability.
Do emojis in subject lines improve open rates?▼
Research shows emojis can increase open rates by 25-56% when used appropriately. They help subject lines stand out in crowded inboxes. However, overuse can appear unprofessional — test with your audience.
How does personalization affect open rates?▼
Personalized subject lines (using "you", "your", or the recipient's name) can increase open rates by 22% according to Campaign Monitor research. They create a sense of direct communication.
Score subject lines — and the entire email too
A great subject line gets opens. But what about the email body? TeamBench lets you build an email content reviewer that scores tone, CTA clarity, brand voice, and compliance — so every email meets your standards.
- Build an email reviewer for tone, clarity, and brand voice
- Score entire email campaigns before sending
- One-click improvement for emails that miss the mark
- Free to start — no credit card required