Emailens vs Email on Acid
Email on Acid is a SaaS email pre-deployment testing platform with screenshots and campaign precheck. Emailens is a developer QA tool with open-source CSS analysis, CLI, and CI/CD integration.
Testing & Previews
| Feature | Emailens | Email on Acid |
|---|---|---|
| Email rendering previews | 15 clients (CSS transform + screenshots) | 100+ clients (screenshot-based) |
| CSS compatibility analysis | Code analysis | |
| Dark mode simulation | ||
| Spam testing | ||
| Accessibility checking | ||
| Link validation | ||
| Campaign Precheck automation |
Developer Workflow
| Feature | Emailens | Email on Acid |
|---|---|---|
| Open-source engine | ||
| CLI tool | ||
| MCP server (AI integration) | ||
| GitHub Action | ||
| REST API | ||
| React Email support | ||
| MJML support | ||
| AI-powered code fixes |
Collaboration
| Feature | Emailens | Email on Acid |
|---|---|---|
| Email analytics | ||
| Template builder | ||
| Team collaboration | Share links | Team plans |
| Unlimited testing | Pro plan | All plans |
Pricing
Emailens
Email on Acid
Why developers choose Emailens
Open-source core
The @emailens/engine npm package is fully open source. Run CSS analysis locally, integrate into any build pipeline, or contribute to the transformation rules.
CI/CD native
GitHub Action and CLI let you catch email rendering issues in pull requests before they reach production. No manual browser-based workflow needed.
8x lower cost
Full access starts at $9/month vs $74/month. No per-seat pricing — your whole team uses one account.
Framework-aware fixes
Emailens understands React Email JSX, MJML, and Maizzle markup. Code fix suggestions are in the syntax you actually write, not generic HTML.
Switch from Email on Acid in minutes
Free tier with 30 daily previews. No credit card, no sales call, no per-seat pricing.