Web App
Web App
Use the Emailens web app to preview, analyze, and debug HTML emails across all major email clients.
The Emailens web app at emailens.dev gives you a visual interface to paste or upload HTML emails and instantly see how they render in 13 email clients.
Features
- Per-client previews — side-by-side rendering for Gmail, Outlook, Apple Mail, Yahoo, Samsung Mail, Thunderbird, HEY Mail, and Superhuman
- 250+ CSS properties — comprehensive compatibility checking auto-synced from caniemail.com
- Compatibility scores — 0-100 score per client based on CSS support analysis
- CSS warnings — actionable warnings with code fix suggestions
- Content hygiene — heuristic content analysis (caps ratio, unsubscribe links, CAN-SPAM, etc.)
- Dark mode simulation — see how each client transforms your email in dark mode
- Screenshots — real browser-rendered screenshots uploaded to cloud storage
- Preview history — authenticated users can access past previews for 30 days
- Diff comparisons — compare two versions of an email to see what changed
Plans
| Plan | Previews/day | API keys | Price |
|---|---|---|---|
| Free | 3 | 0 | $0 |
| Dev | 50 | 1 | $9/mo |
| Pro | Unlimited | 10 | $19/mo |
No account is required for basic usage. Sign in with Google or GitHub to unlock higher limits and preview history.
Next steps
- Preview tool — using the preview editor
- Dashboard — managing your preview history
- Dark mode preview — viewing dark mode variants
- Sharing — sharing previews with your team