Email on Acid alternatives in 2026

Email on Acid has become Mailgun Inspect. Subscribers started moving across in June 2026, and annual customers move when their term ends. If you're one of them, it's a natural moment to ask whether you still need everything you're paying for. (For what changes if you stay, see Email on Acid is now Mailgun Inspect.)

This guide covers the options we'd consider, what they cost, and who each suits. One thing up front: we make EmailTestr, which is on this list. We've tried to be fair, and we're clear about what EmailTestr doesn't do yet.

What do you actually need?

Before comparing tools, it helps to be honest about how you use them. Most teams we speak to check the same handful of clients every time:

• Apple Mail on iPhone and Mac, including dark mode
• Gmail on the web and the Gmail app
• Outlook, especially the classic Windows app, which lays out email with Microsoft Word's engine

They also want the dull but useful checks: broken links, missing alt text, and whether Gmail will clip the email. If that sounds like you, a tool with 100+ device previews may be more than you need.

The options

Mailgun Inspect (formerly Email on Acid)

• Price: $99 a month for 1,000 previews (Basic), or $199 a month for 2,000 (Premium). Extra previews are $0.15 each.
• Good for: teams that need wide coverage, with 100+ clients and devices.
• Worth knowing: accessibility, code analysis, link and image validation and spam checks are on the Premium plan. Past tests and previews don't move over from Email on Acid, and Mailgun's migration notes said spam testing and a code editor weren't available at launch. Users are unlimited, and the first month is free.

Litmus

• Price: Litmus no longer publishes prices, so you'll need a quote. Its last public plan, Core, was $500 a month.
• Good for: larger teams that also want analytics, personalisation and collaboration features.
• Worth knowing: it's the most complete option, and priced for it.

Folderly Frame

• Price: early access, with a free tier and paid plans from about $24 a month. Folderly says pricing is still being set with its first users.
• Good for: previews plus a code linter, from a company best known for deliverability.
• Worth knowing: it's new, so check the clients it covers today.

EmailQA

• Price: free plan, then $20 a month.
• Good for: quick previews and sharing feedback.
• Worth knowing: check which clients you need are covered before you switch.

Do it yourself

• Price: free, apart from your time.
• How: create test accounts in Gmail, Outlook.com and Yahoo, send yourself each email, and check it on your own phone and computer.
• Worth knowing: it works, but it's slow, and you'll only see the devices you own. Classic Outlook for Windows needs a Windows machine with Office.

EmailTestr

• Price: free during early access. Paid plans are planned from £9 a month.
• Good for: freelancers and small teams who check the same few clients and want clear fixes.
• What it does today: Apple Mail previews on iPhone and Mac in light and dark mode, simulated in WebKit (the engine Apple Mail uses), twelve HTML checks that point at the line to fix, and a private address to send tests to from your email platform. Unlimited team members.
• What it doesn't do yet: real Outlook.com and Yahoo inbox screenshots are coming soon, then Gmail. If you need classic Outlook today, EmailTestr isn't enough on its own.
• Compare: EmailTestr vs Email on Acid, vs Mailgun Inspect, vs Litmus.

At a glance

Tool	Starting price	Previews included	Clients
Mailgun Inspect	$99 a month	1,000 a month	100+
Litmus	Quote only	Varies	100+
Folderly Frame	Free, then from about $24 a month	Varies	Check their list
EmailQA	Free, then $20 a month	Varies	Check their list
Do it yourself	Free	Unlimited	Whatever you own
EmailTestr	Free in early access	1,000 a month	Apple Mail today, Outlook.com and Yahoo next

Our take

If you need dozens of clients, or your clients demand Outlook 2016 screenshots, Mailgun Inspect or Litmus are still the safe choice. If you mostly check Apple Mail, Gmail and Outlook and want to stop paying $99 a month for previews you don't use, try a lighter tool first, and keep a couple of test inboxes for the rest.

Prices checked in November 2026 from each vendor's website and public pricing listings. They change often, so check the vendor's own page before you decide.

Sources: Mailgun Inspect pricing, Email on Acid pricing and transition notice, Litmus pricing listing on Capterra, Litmus pricing notes, Reachkit, EmailQA, Folderly Frame, Mailgun: Email on Acid to Inspect API migration plan.