Best Email Testing · pricing · Updated June 2026
Mailgun Inspect (formerly Email on Acid) pricing (2026)
Mailgun Inspect (formerly Email on Acid) starts at $99/mo (Basic), across 3 plans. Best for Teams already on Mailgun. Every figure links to Mailgun Inspect (formerly Email on Acid)'s own page 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
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 | Quote-only | — | 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 2026-06-18. 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. Cross-checked against emailonacid.com.
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 2026-06-18.
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 $20/mo. Verified 2026-06-18.
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 → · Open data · MCP