Email Testing · pricing · Updated September 2026
Mailgun Inspect (formerly Email on Acid) pricing (2026)
Mailgun Inspect (formerly Email on Acid) starts at $99/mo (Basic) as checked on 2026-09-02, read from Mailgun Inspect (formerly Email on Acid)'s own pricing page; 3 plans. Best for Teams already on Mailgun. Every figure below links to its source and the date we captured it.
At a glance
- Entry price: $99/mo (Basic)
- Free tier: No · 30-day trial
- Compliance: HIPAA Yes · SOC 2 Yes · GDPR Yes
- Best for: Teams already on Mailgun; Email QA with accessibility compliance; Mid-size email teams
As of · every figure below links to its source
Mailgun Inspect (formerly Email on Acid) plans & pricing
| Plan | Monthly | Annual | Billing | Notes | Source |
|---|---|---|---|---|---|
| Basic | $99 | — | flat | 1,000 email previews/month; unlimited users; 100+ email clients and devices; API access; $0.15/preview overage. Includes 1-month free trial (not a forever-free tier). | mailgun.com |
| Premium | $199 | — | flat | 2,000 email previews/month; unlimited users; 100+ email clients and devices; API access; accessibility tests; HTML code analysis; link and image validation; spam content checks; $0.15/preview overage. Includes 1-month free trial. | mailgun.com |
| Contract | not priced monthly | — | custom | Custom preview allotment; unlimited users; all Premium features. Contact sales. Existing Email on Acid annual customers migrate at term end starting June 2026. | mailgun.com |
Last verified 2026-09-02. Re-fetched mailgun.com/pricing/inspect on 2026-06-18: Basic $99 and Premium $199 confirmed exactly, $0.15/preview overage, 1-month free trial, Contract = contact-sales. emailonacid.com/pricing confirms the same Basic $99 / Premium $199 and documents migration to Mailgun Inspect beginning June 2026. Mailgun security page confirms HIPAA and SOC 2 Type II. Re-verified 2026-09-02 against the live pricing page; published figures unchanged. Cross-checked against emailonacid.com.
Price changes
Price on record
$99/moFirst on record 2026-06-27
A new dated entry is stamped here each time the price moves — the record builds itself.
Tracked since June 2026. No change record has cleared two sources yet, so nothing is published on the wire.
Capabilities
Integrations: Mailgun Send, Mailgun Optimize, REST API.
Key features: 100+ email client and device previews; Accessibility testing and HTML code analysis; Link and image validation; Spam content checks on Premium+.
Plan limits: 1,000 previews/month on Basic; 2,000 previews/month on Premium; $0.15/preview overage on both self-serve plans.
Frequently asked questions
How much does Mailgun Inspect (formerly Email on Acid) cost?
Mailgun Inspect (formerly Email on Acid) starts at $99/mo (Basic); it has 3 published plans. Verified 2026-09-02.
What are cheaper alternatives to Mailgun Inspect (formerly Email on Acid)?
Cheaper email testing than Mailgun Inspect (formerly Email on Acid) (entry $99/mo) include Testi@ at $7/mo, Mailtrap at $17/mo, Mailosaur at $25/mo. Verified 2026-09-02.
Does Mailgun Inspect (formerly Email on Acid) support HIPAA?
Mailgun Inspect (formerly Email on Acid) HIPAA support: Yes. SOC 2: Yes. GDPR: Yes.
Does Mailgun Inspect (formerly Email on Acid) have a free plan?
Mailgun Inspect (formerly Email on Acid) free tier: No; 30-day free trial.
Mailgun Inspect (formerly Email on Acid) vs alternatives
Compare all email testing · Mailgun Inspect (formerly Email on Acid) alternatives · True cost of email testing · SOC 2-certified email testing · GDPR-compliant email testing · Open data · MCP
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Display this standing
Mailgun Inspect (formerly Email on Acid) currently holds a bronze deskmark here — Rank 6 of 6 · Email Testing. Anyone may show it. There is nothing to apply for, nothing to pay, and displaying it changes no score: the standing comes from the published algorithm and money never touches it.
The image is drawn from our live data, so it follows the standing rather than freezing it: if Mailgun Inspect (formerly Email on Acid) moves up or down a tier, the plaque on your own site says so at our next publish. Nothing is tracked beyond the ordinary web-server log that records any image request.