Looks Good Mail

Test your email HTML across 26 email clients. Get compatibility checks and automatic fixes for common issues.

Email HTML

Email Clients to Test

Your email address

We may email you about future Looks Good Mail product updates. No marketing spam.

What we test: We run conservative, client-specific checks across major desktop, web, and mobile email clients. Tests are based on known rendering behavior and degradation patterns. Results are client-scoped assessments, not guarantees.

Open source on GitHub. Contributions welcome!