Email Subject Line Tester

A good email subject line is 30-50 characters long, uses power words that evoke emotion or curiosity, feels personalized to the reader, creates a sense of urgency without being spammy, and avoids common spam trigger words like "free", "act now", or excessive punctuation. Our tester scores each of these factors individually.

The ideal length is 30-50 characters (6-10 words). Subject lines in this range have the highest open rates because they display fully on most email clients and mobile devices. Lines under 30 characters may lack context, while those over 60 characters get truncated on mobile.

Our spam checker scans your subject line for known spam trigger words and patterns that email filters flag. Words like "guaranteed", "free money", "act now", excessive caps, and multiple exclamation marks can land your email in spam. A high spam score means fewer trigger words detected, which is better for deliverability.

Power words are emotionally compelling terms that drive action. Examples include "exclusive", "proven", "secret", "discover", "breakthrough", "limited", and "insider". They grab attention and increase open rates by triggering curiosity, urgency, or desire in the reader.

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