Comparison
EmailStitch vs Email on Acid: previews of a finished email vs a workspace that produces it.
Email on Acid is now Mailgun Inspect: previews in 100+ clients and devices plus content checks. EmailStitch is where the template is built and translated, checked in every language, and pushed to your ESP.
Get startedWhy teams choose EmailStitch over Email on Acid
- 01
Problems caught while you build
The code editor flags broken HTML and features Gmail, Outlook for Windows and Apple Mail handle badly as you type, before there is anything to preview.
- 02
Every language checked at no extra cost
Review runs on every language version on every plan. Nothing is counted per screenshot, so ten languages cost the same as one.
- 03
Checks tied to your ESP
A missing unsubscribe tag for your ESP, merge tags that did not resolve and broken personalization are Blockers, with one-click fixes for simple problems.
- 04
From build to ESP in one tool
Build, translate, review and push each language to Mailchimp, Klaviyo, Brevo, HubSpot, ActiveCampaign or Omnisend without exporting to another tool.
- EmailStitch price
- Free plan, then from $19 per month. QA on every language included.
- Email on Acid price
- $99 per month for 1,000 previews or $199 for 2,000. Each extra preview costs $0.15.
EmailStitch vs Email on Acid: feature comparison
| Feature | EmailStitch | Email on Acid |
|---|---|---|
| Screenshots in real email clients and devices (100+) | ✕ | ✓ |
| Link and image validation | ✓ | ✓ |
| Accessibility checks | ± | ✓ |
| HTML code analysis | ✓ | ✓ |
| Checks run on every language version separately | ✓ | ✕ |
| Builds the email (code editor and drag-and-drop modules) | ✓ | ✕ |
| Language versions with a translation grid and Excel/CSV | ✓ | ✕ |
| Push to Mailchimp, Klaviyo, Brevo, HubSpot, ActiveCampaign, Omnisend | ✓ | ✕ |
| Free plan | ✓ | ✕ |
✓ supported · ✕ not supported · ± partial · — not applicable
Email on Acid details checked on their public website on October 11, 2026. ✕ in the Email on Acid column means we did not find the feature there.
Email on Acid is now Mailgun Inspect
The Email on Acid site now presents its previews and QA tools as part of Mailgun Inspect, a pre-send suite from Sinch, the company behind Mailgun and Mailjet. The site notes that existing Email on Acid previews and tests do not carry over to Inspect, so moving now is a natural point to compare options.
Inspect checks a finished email: previews in 100+ clients and devices, WCAG 2.2 accessibility, link and image validation and spam content analysis. It does not build or send email.
What EmailStitch checks, and when
In EmailStitch the checks start while you build. The code editor flags broken HTML and features with weak support in Gmail, Outlook for Windows and Apple Mail. Review then compiles every language version and groups findings from Blockers to Signals: dead links, a missing unsubscribe tag for your ESP, unresolved merge tags, empty translations, text in the wrong language and HTML near the Gmail clipping limit.
Simple problems such as a missing lang attribute, a layout table without role="presentation" or an empty alt attribute have one-click fixes.
Previews per screenshot vs one template per campaign
Inspect counts every client screenshot as one preview. Ten languages times twenty clients is 200 previews for one campaign.
EmailStitch is priced per workspace, template and seat, and Review runs on every language at no extra cost. If you still want client screenshots, run them on the final version of each language after Review is clean.
EmailStitch vs Email on Acid: FAQ
Is Email on Acid shutting down?
Its website now presents Email on Acid as evolved into Mailgun Inspect, part of Sinch. The Email on Acid name is still on the site, but plans and new features are under Inspect.
Is EmailStitch an Email on Acid alternative?
Yes. EmailStitch checks links, images, HTML, unsubscribe tags, merge tags and language mismatches on every language version, and it also builds the template and pushes it to your ESP, all from $19 per month.
How much does Email on Acid cost?
As of October 2026: Basic $99 per month with 1,000 previews, Premium $199 per month with 2,000 previews and the content checks, and a custom contract plan. Both paid plans include unlimited users.
Can I use EmailStitch with Email on Acid or Litmus?
Yes. Build, translate and run Review in EmailStitch, then preview the final HTML of each language in a client-preview tool before you send.
Catch the blockers while you build, in every language.
Build, Localize, Review and Publish in one workspace. Free plan, no credit card.
Get started