# Email on Acid vs MailHog

**Leader by Vioscale score:** Email on Acid

| Attribute | Email on Acid | MailHog |
|---|---|---|
| **Vioscale score** | 58.3 (66% (medium)) | 42.8 (19% (low)) |
| activity.commits_last_30d | - | 0 |
| adoption.dependent_repos | - | 11 |
| adoption.github_stars | - | 16,138 |
| deployment.options | `{"cloud":true}` | `{"cloud":true,"self_hosted":true}` |
| description.long | Tests email campaigns across 100+ email clients and devices to identify rendering issues, validate content for inbox compatibility, check accessibility compliance, and detect deliverability problems before sending. | MailHog intercepts and stores SMTP messages during development, providing a web UI and JSON API for viewing and managing test emails, with the option to forward messages to real mail servers. |
| features.capabilities | `{"open_source":false,"sms_testing":false,"api_assertions":true,"spam_score_check":true,"ci_cd_integration":false,"rendering_preview":true,"multi_user_inboxes":false,"production_sending_addon":false,"blocklist_deliverability_check":true}` | `{"open_source":true,"sms_testing":false,"api_assertions":true,"spam_score_check":false,"ci_cd_integration":false,"rendering_preview":true,"multi_user_inboxes":true,"production_sending_addon":true,"blocklist_deliverability_check":false}` |
| language.primary | - | Go |
| license.spdx | - | MIT |
| market.availability | `{"primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | - |
| platform.support | `{"web":true}` | `{"mac":true,"web":true,"linux":true}` |
| pricing | `{"type":"subscription","plans":[{"free":false,"name":"Basic","summary":"$99/month, $0.15 per preview overage","features":["1,000 email previews per month","100+ email preview clients and devices","Unlimited users","API access","Overage charges for additional previews"],"commitment":"monthly","components":[{"kind":"fixed","amount":99,"period":"month","currency":"USD"},{"per":{"qty":1,"unit":"preview"},"kind":"metered","amount":0.15,"currency":"USD"}],"description":"Email preview testing with API access","contactSales":false,"includedLimits":{"previews":"1,000/mo","clients_devices":"100+"}},{"free":false,"name":"Premium","summary":"$199/month","features":["2,000 email previews per month","100+ email preview clients and devices","Unlimited users","Accessibility tests (WCAG 2.2 / European Accessibility Act compliance)","HTML code analysis","Link and image validation","Spam content checks across major ISPs"],"commitment":"monthly","components":[{"kind":"fixed","amount":199,"period":"month","currency":"USD"}],"description":"Full QA suite with accessibility testing and content analysis","contactSales":false,"includedLimits":{"previews":"2,000/mo","clients_devices":"100+"}},{"free":false,"name":"Custom","summary":"Custom pricing","features":["Custom preview allotments","Phone and chat support","Dedicated support documentation"],"description":"Custom preview allotments and enterprise support","contactSales":true}],"summary":"From $99/month. 7-day free trial.","currency":"USD","freeTier":false,"sourceUrl":"https://www.emailonacid.com/pricing/","retrievedAt":"2026-08-25T12:11:37.247Z","freeTrialDays":7,"startingPrice":{"amount":99,"period":"month","currency":"USD"},"billingPeriods":["month"]}` | - |
| pricing.free_tier | no | - |
| pricing.model | commercial | commercial |
| pricing.price_level | high | - |
| pricing.starting_price | `{"amount":99,"currency":"USD"}` | - |
| pricing.transparent | yes | - |
| release.cadence_days | - | 11 |
| release.history | - | `[{"url":"https://github.com/mailhog/MailHog/releases/tag/v1.0.1","date":"2020-08-11T18:04:41Z","type":"stable","version":"v1.0.1"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v1.0.0","date":"2017-04-16T23:36:18Z","type":"stable","version":"v1.0.0"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.2.1","date":"2016-09-04T18:31:48Z","type":"stable","version":"v0.2.1"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.2.0","date":"2016-03-20T17:23:21Z","type":"stable","version":"v0.2.0"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.9","date":"2016-03-13T19:24:01Z","type":"stable","version":"v0.1.9"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.8","date":"2015-10-06T20:29:59Z","type":"stable","version":"v0.1.8"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.7","date":"2015-05-20T20:03:57Z","type":"stable","version":"v0.1.7"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.6","date":"2015-03-14T10:01:38Z","type":"stable","version":"v0.1.6"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.5","date":"2015-02-12T21:30:55Z","type":"stable","version":"v0.1.5"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.4","date":"2015-02-12T20:57:47Z","type":"stable","version":"v0.1.4"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.3","date":"2015-01-08T22:36:13Z","type":"stable","version":"v0.1.3"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.2","date":"2015-01-08T21:17:03Z","type":"stable","version":"v0.1.2"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.1","date":"2015-01-04T12:54:33Z","type":"stable","version":"v0.1.1"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.0","date":"2014-12-27T13:50:55Z","type":"stable","version":"v0.1.0"},{"url":"https://github.com/mailhog/MailHog/releases/tag/0.09","date":"2014-12-24T13:40:49Z","type":"prerelease","version":"0.09"},{"url":"https://github.com/mailhog/MailHog/releases/tag/0.08","date":"2014-12-21T09:34:14Z","type":"prerelease","version":"0.08"},{"url":"https://github.com/mailhog/MailHog/releases/tag/0.07","date":"2014-11-18T08:10:22Z","type":"prerelease","version":"0.07"},{"url":"https://github.com/mailhog/MailHog/releases/tag/0.06","date":"2014-11-13T18:23:01Z","type":"prerelease","version":"0.06"},{"url":"https://github.com/mailhog/MailHog/releases/tag/0.05","date":"2014-11-01T22:51:22Z","type":"prerelease","version":"0.05"},{"url":"https://github.com/mailhog/MailHog/releases/tag/0.04","date":"2014-10-29T18:53:09Z","type":"prerelease","version":"0.04"}]` |
| reliability.sla_pct | 99.9 | - |
| security.gdpr | yes | - |
| security.iso27001 | yes | - |
| security.scorecard | - | 2.6 |
| security.soc2 | yes | - |
| security.vulnerabilities | - | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fmailhog%2FMailHog&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (Email Testing Dev)

| Capability | Email on Acid | MailHog |
|---|:--:|:--:|
| **Capabilities** |  |  |
| API assertions | ✓ | ✓ |
| Rendering preview | ✓ | ✓ |
| Spam score check | ✓ | ✗ |
| Blocklist deliverability check | ✓ | ✗ |
| SMS testing | ✗ | ✗ |
| Production sending addon | ✗ | ✓ |
| Ci cd integration | ✗ | ✗ |
| Multi user inboxes | ✗ | ✓ |
| Open source | ✗ | ✓ |

*Source: Vioscale. Generated 2026-09-01T16:31:01.450Z. "-" = undocumented, not absent.*