Best Email Testing · alternatives
Best Mailgun Inspect (formerly Email on Acid) alternatives (2026)
5 alternatives to Mailgun Inspect (formerly Email on Acid) in email testing, ranked by entry price. Mailgun Inspect (formerly Email on Acid) starts at $99/mo. Every figure links to the public page it was captured from — the vendor's own wherever the vendor publishes the number, otherwise the named public source — with the date we captured it.
Key takeaways
- Cheaper than Mailgun Inspect (formerly Email on Acid): Mailpit, Mailtrap, Testi@, Mailosaur.
- Free alternatives: Mailpit, Mailtrap, Testi@.
- Closest by price: Mailpit ($0/mo), Mailtrap ($0/mo), Testi@ ($0/mo).
Mailgun Inspect (formerly Email on Acid) alternatives compared
| # | Alternative | Entry price | Free | HIPAA | Best for | Source |
|---|---|---|---|---|---|---|
| 1 | Mailpit | $0/mo | Yes | — | Developers needing local/CI email testing | github.com |
| 2 | Mailtrap | $0/mo | Yes | — | Developer teams | mailtrap.io |
| 3 | Testi@ | $0/mo | Yes | — | Freelancers | testi.at |
| 4 | Mailosaur | $25/mo | No | — | QA automation engineers | mailosaur.com |
| 5 | Litmus | not priced monthly | No | — | Enterprise marketing teams | litmus.com |
Data current through 2026-09-17. Compare any two directly on the Email Testing index.