Email on Acid
Depends
Confidence: Medium
Buy if you're a high-volume email team or agency needing multi-client rendering QA cheaper than Litmus.
New check
Comparison
Email on Acid vs Litmus
Email on Acid and Litmus both land on Depends.
Litmus
Depends
Confidence: Medium
Buy if you're an enterprise email team or agency that QA-tests every send and can absorb steep per-seat pricing.
| Compare | Email on Acid | Litmus |
|---|---|---|
| Verdict | Depends | Depends |
| Best for | High-volume email marketers | Enterprise email teams QA-ing every send |
| Who it's not for | Small teams sending occasional campaigns | Small businesses or solo senders . $500/mo entry is overkill |
| Privacy | No known public vulnerabilities found in the sources reviewed.⁸ | SOC 2 Type 2 with zero exceptions (2024); one community-reported XSS on. |
| Support quality | No support evidence found | No support-quality evidence found |
| Public sentiment | Users like the ease of use and layout previews but are upset about the forced Mailgun Inspect migration and its usage-based pricing.¹ | Email professionals praise Litmus as best-in-class testing, but 2025 price hikes drove vocal users to hunt for cheaper alternatives.16 |
| Biggest gotcha | Migration to Mailgun Inspect begins June 2026; factor re-onboarding into any annual commitment.⁶ | 2025 price hikes hit the Individuals plan hard; Reddit calls it price gouging and users are fleeing. |
Pick Email on Acid when
- High-volume email marketers
- Agencies QA-ing client campaigns
- Email design/dev teams needing multi-client previews
When Email on Acid is not a fit
- Small teams sending occasional campaigns
- Anyone needing SMTP or deliverability testing
- New buyers before June 2026 . evaluate Mailgun Inspect directly instead
- Teams that refuse usage-based billing
Pick Litmus when
- Enterprise email teams QA-ing every send
- Agencies testing across many client brands
- Marketing Cloud / HubSpot users adding pre-send QA
- Brands wanting analytics beyond ESP reports
When Litmus is not a fit
- Small businesses or solo senders . $500/mo entry is overkill
- Anyone wanting a full ESP . Litmus tests, it doesn't send
- Price-sensitive teams burned by the 2025 hikes
- Startups fine with their ESP's built-in previews
Sources
review
- Email on Acid on Gartner Peer Insightsgartner.comreview
- Email on Acid Software Pricing - Capterracapterra.comreview
- Email on Acid Reviews - GetApp UKgetapp.co.ukreview
review
- Meet Mailgun Inspect - Mailgun blogmailgun.comnews
- Email on Acid Pricing pageemailonacid.comofficial
- Email on Acid Security Standards (ISO 27001)emailonacid.comsecurity
- Sinch Trust Centertrust.sinch.comsecurity
- Enterprise Email Security - Mailgunmailgun.comofficial
- Litmus vs Email on Acidlitmus.comofficial
- Email on Acid - Software Advice AUsoftwareadvice.com.aureview
- SparkToro case study - Mailgunmailgun.comofficial
- Aztek case study - Email on Acidemailonacid.comofficial
review