What is Email on Acid?

**Email on Acid** provides email testing and optimization similar to **Litmus**: rendering previews, spam testing, accessibility checking, and analytics. It competes as comprehensive testing platform with slightly different pricing and features.

Distinguishing features: campaign precheck combining multiple tests in one report, certain client coverage differences, and pricing structures that may favor different usage patterns.

Choosing between **Email on Acid** and **Litmus**: compare client coverage for your audience, evaluate interface preferences, consider **ESP** integrations you need, and assess pricing for your testing volume. Both provide professional-grade testing; differences are in details.