Email on Acid is becoming Mailgun Inspect: what changes, and your options
Since June 2026, Email on Acid subscription customers have been moving to Mailgun Inspect, Mailgun's rebuilt email QA suite. The plans, the pricing model and your account history all change in the move. Here's what's confirmed, what to do before your migration date, and how to decide whether to stay.
The short version
- Monthly subscribers started moving in June 2026. Annual plans move at the end of their current term, and contracts keep their features until the contract ends.
- Inspect Basic is $99/month for 1,000 previews and Premium is $199/month for 2,000. Past that, every preview costs $0.15.
- Accessibility tests, HTML code analysis, link and image validation and spam analysis are Premium-only.
- Users are unlimited on every plan, and the paid plans come with a 30-day trial.
- Your existing previews and tests don't transfer. Export anything you need before your account moves.
The timeline
Mailgun announced Inspect in April 2026 and began moving Email on Acid customers over in June. When you move depends on how you pay:
| If you're on | You move |
|---|---|
| A monthly subscription | From June 2026 |
| An annual subscription | At the end of your current term |
| A contract | Features continue through the rest of your contract; contracts began transitioning in June 2026 |
Current subscribers are promised a migration discount on Inspect, with the details delivered in the app and by email, so watch for that notice before you compare prices.
Mailgun Inspect plans and pricing
| Plan | Price | Previews a month | Includes |
|---|---|---|---|
| Basic | $99/month | 1,000, then $0.15 each | 100+ email clients and devices, unlimited users, API access, ticket support |
| Premium | $199/month | 2,000, then $0.15 each | Everything in Basic, plus accessibility tests, HTML code analysis, link and image validation, content spam analysis, phone and chat support |
| Contract | Custom | Custom | Custom allowance and support |
What counts as a preview matters. Email on Acid's pricing page says each screenshot of an individual device or client counts as one. Checking a single email in 30 clients uses 30 previews, so Basic's 1,000 covers about 33 full tests a month. If you test every email twice, a draft and a final, that's about 16 emails.
The two changes that matter most
The QA checks moved up a plan. If you used Email on Acid for accessibility checks, link and image validation or spam analysis, those are Premium features in Inspect. Your like-for-like price is $199/month, not the $99 headline.
Previews are metered. Every plan has a monthly preview allowance and a $0.15 charge for each preview beyond it. Work out your real volume before you pick a plan: clients per test, times tests per email, times emails per month.
There's also a genuine improvement: users are unlimited on every plan, so seat counts stop mattering and everyone who reviews email can have their own login.
What doesn't come with you
Email on Acid's pricing page is direct about it: existing previews and tests will not be transferred during the migration. If you keep screenshots as a record of what was approved, for clients, compliance or your own QA history, export them before your account moves. The same goes for saved tests you still refer back to.
If you call the Email on Acid API, budget time for the integration too. Mailgun's help center has an API migration plan for moving to the Inspect API.
Your options
Move to Mailgun Inspect
The natural choice if you rely on the automated checks (accessibility, code analysis, spam), need coverage across 100+ clients and devices, and your volume fits the preview allowance. Budget for Premium if you use the checks.
Move to Litmus
Litmus's entry plan, Core, is about $500/month since it dropped its cheaper plans in 2025. It has the broadest client coverage and adds email analytics, so it makes sense when you want both and the budget is there. Our Litmus vs Email on Acid comparison goes through the differences.
Move to EmailQA
EmailQA is $20/month for 1,000 real-device renders across 11 email clients: Outlook on Windows, Mac, web and mobile, Gmail on the web and mobile, and Apple Mail on Mac and iOS, each in light and dark mode. Reviewers pin comments right on the email without creating an account, and your team signs off on each version. A full test of all 11 clients uses 11 renders, so Pro covers about 90 full tests a month.
It fits teams that used Email on Acid mainly to see how emails render and to get them reviewed. It doesn't replace Inspect Premium's automated audits: EmailQA's checks cover links, images, spelling and the inbox preview, with no accessibility or spam audits, and it covers 11 clients, not 100+. The full EmailQA vs Mailgun Inspect comparison lays out both sides.
Or run both
Some teams keep Inspect for pre-send audits and use EmailQA for real-device review and client feedback. That costs more than either alone, so it's worth it only if both jobs are real for you.
Before your migration date
- Export the previews and saved tests you want to keep.
- Count your monthly previews (clients per test × tests per email × emails) and compare with 1,000 and 2,000.
- List the checks you actually use. If any are accessibility, code, link and image, or spam checks, price Premium.
- If you use the API, read Mailgun's API migration plan and schedule the work.
- Look for the migration discount notice in the app and your inbox.
- Trial the options side by side on real emails: Inspect's paid plans have a 30-day trial, and EmailQA's Pro trial is 14 days with no credit card.
Sources
Checked September 23, 2026. Prices and plans change, so confirm on the vendor pages before you decide: Email on Acid pricing, Mailgun's Inspect announcement (April 9, 2026) and Litmus pricing on Capterra.