Email on Acid alternative
An Email on Acid alternative for small teams
Email on Acid has become Mailgun Inspect. Subscription customers started moving across in June 2026, annual customers move when their term ends, and plans start at $99 a month.
If you mostly check the same few email clients before you send, you may not need 100+ previews. EmailTestr covers the clients most people check, plus the dull but useful checks, for a price a freelancer or small team doesn't have to think about.
EmailTestr and Email on Acid compared
| Feature | EmailTestr | Email on Acid |
|---|---|---|
| Price | Free during early access. Paid plans planned from £9 ($12) a month | Now Mailgun Inspect: $99 a month (Basic) or $199 a month (Premium) |
| Previews included | 1,000 a month in early access; failed previews never count | 1,000 (Basic) or 2,000 (Premium) a month, then $0.15 each |
| Email clients | A focused set: the clients most people actually check | 100+ clients and devices |
| Apple Mail, light and dark | Yes, iPhone and Mac, light and dark (simulated in WebKit) | Yes |
| Gmail, Outlook.com, Yahoo | Outlook.com and Yahoo real inbox screenshots coming soon; Gmail next | Yes |
| Outlook for Windows | Planned | Yes |
| Link, image and accessibility checks | 12 checks on every test, free on every plan | On the $199 Premium plan |
| Code view with problem lines | Yes: click an issue, see the line highlighted | Code analysis on Premium; Mailgun's migration notes said the code editor would follow later |
| Test what your platform sends | Yes: a private address to send tests to from any platform | Yes, by email or from integrations |
| Spam testing | Spam signals in the checks (URL shorteners, shouting subjects). No full spam filter testing | Spam content checks on Premium; Mailgun's notes said spam testing wasn't available at launch |
| Team members | Unlimited team members | Unlimited users |
Facts about Email on Acid checked in November 2026 from public sources (below). Prices change, so check their site before you decide.
Choose Email on Acid if
- You need a wide range of clients and devices, including older Outlook versions and Android apps, today.
- You send at high volume and want everything in one Mailgun account alongside sending.
Choose EmailTestr if
- You check Apple Mail, Gmail and Outlook and want to stop paying for previews you don't use.
- You want every issue explained, with the exact line to fix, not just a pass or fail.
- You'd rather start free and pay a small monthly fee later than commit to $99 a month.
Questions
Sources: Mailgun Inspect pricing, Mailgun: Inspect, the next generation of Email on Acid, Mailgun: Email on Acid to Inspect API migration plan.
Also comparing: Mailgun Inspect · Litmus