Best Email Testing · head-to-head
Testi@ vs Mailgun Inspect (formerly Email on Acid)
A sourced, side-by-side comparison for email testing. Testi@ has the lower entry price. Every figure links to the vendor's own page and the date we captured it.
At a glance
- Price: Testi@ $0/mo vs Mailgun Inspect (formerly Email on Acid) $99/mo — Testi@ is cheaper to start.
- Free tier: Testi@ Yes; Mailgun Inspect (formerly Email on Acid) No.
- HIPAA: Testi@ —; Mailgun Inspect (formerly Email on Acid) Yes.
Side by side
| Testi@ | Mailgun Inspect (formerly Email on Acid) | |
|---|---|---|
| Entry price | $0/mo (Free) | $99/mo (Basic) |
| Free tier | Yes | No |
| HIPAA (BAA) | — | Yes |
| SOC 2 | — | Yes |
| GDPR | — | Yes |
| Best for | Freelancers | Teams already on Mailgun |
Sources — Testi@: testi.at (verified 2026-06-18). Mailgun Inspect (formerly Email on Acid): mailgun.com (verified 2026-06-18).
Key features
Testi@: Screenshots from ~50 email clients in seconds; Pay-as-you-go access periods (no subscription required); Spam testing included; Chrome extension for quick testing
Mailgun Inspect (formerly Email on Acid): 100+ email client and device previews; Accessibility testing and HTML code analysis; Link and image validation; Spam content checks on Premium+