Email on Acid → Mailgun Inspect · June 2026

Email on Acid is becoming Mailgun Inspect. You don't have to land in a sending suite you didn't ask for.

Starting June 2026, every Email on Acid customer is migrated into Mailgun Inspect (Sinch). New workflow, new suite, re-learning cost. If you're being moved anyway, you're a shopper now. Frame is the opposite of suite-consolidation: standalone, fast, paste-any-HTML — and it scores deliverability, not just render.

Preview your email free → Join the early list
Standalone · no platform to adopt · no per-preview surprises
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Built by Vlad Podolyako — founder of Folderly (B2B email deliverability) and Belkins. Frame answers render and deliverability in one paste.

An escape hatch, not another suite.

Mailgun Inspect locks email QA inside a sending platform. Frame does the opposite — your campaigns are just HTML. Paste them here. There's no sender to adopt, no suite to migrate into, no account to wire up to try it.

Open the live preview →

Honest about what it tested.

Every preview is labeled by how we made it — engine-accurate render, rule-simulated Outlook, or real-client. We never fake a screenshot we can't stand behind. That's the point. You get the previews and the compatibility linter you relied on at Email on Acid — plus the deliverability answer it never had.

Email on Acid vs Folderly Frame

Email on AcidFolderly Frame
Entry price$99/mo (1,000 previews) · $0.15/preview overageFree → from $24/mo · spend-cap, no per-preview surprise
Standalone?Becoming part of Mailgun Inspect (Sinch)Yes — paste any HTML, no platform lock
Compatibility linterYesYes (caniemail-driven)
Will-it-land deliverability scoreNoYes — the whole point
SpeedFarm renderSeconds, engine-accurate

Launch pricing, being locked with the first cohort. Active Folderly customers get Frame included.

What changes when EoA becomes Mailgun Inspect.

We're writing an honest migration guide — what actually changes, what you keep, and your options (including the ones that aren't us). Join the list and we'll send it the moment it's ready.

Send me the migration guide →

Don't get migrated into a suite you didn't choose.

Join the early list — first access, early-bird pricing, the migration guide, and a say in what we cover first.