Email Subject Line Tester
Paste your subject line and get an instant score based on length, spam-trigger words, urgency, personalization and formatting — the same things that affect open rates and inbox placement.
Your subject line
0 characters
The score starts at 100 and deducts points for common open-rate killers: lines that are too long or too short, ALL CAPS words, excessive punctuation (like "!!!" or "$$$"), classic spam-trigger phrases (e.g. "free", "buy now", "act now", "click here", "100% guaranteed"), and missing personalization or curiosity hooks. It's a heuristic guide, not a spam-filter guarantee — always test with real sends when possible.