# Email on Acid vs MailSlurp

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

| Attribute | Email on Acid | MailSlurp |
|---|---|---|
| **Vioscale score** | 58.3 (66% (medium)) | 49.5 (54% (medium)) |
| deployment.options | `{"cloud":true}` | `{"cloud":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. | A testing and automation platform providing real email inboxes and phone numbers via APIs and SDKs, enabling developers to verify email flows, OTP delivery, and message behavior in automated tests and CI/CD pipelines. |
| 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":false,"sms_testing":true,"api_assertions":true,"spam_score_check":true,"ci_cd_integration":true,"rendering_preview":true,"multi_user_inboxes":true,"production_sending_addon":true,"blocklist_deliverability_check":true}` |
| integrations.count | - | 8 |
| integrations.list | - | `[{"name":"Zapier"},{"name":"Gmail"},{"name":"Outlook"},{"name":"Dropbox"},{"name":"Google Drive"},{"name":"Playwright"},{"name":"CypressJS"},{"name":"ACCELQ"}]` |
| market.availability | `{"primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | - |
| platform.support | `{"web":true}` | `{"web":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"]}` | `{"freeTier":true,"sourceUrl":"https://www.mailslurp.com/compare/sendgrid-pricing/","retrievedAt":"2026-08-25T12:11:49.908Z"}` |
| pricing.free_tier | no | yes |
| pricing.model | commercial | freemium |
| pricing.price_level | high | low |
| pricing.starting_price | `{"amount":99,"currency":"USD"}` | - |
| pricing.transparent | yes | no |
| reliability.sla_pct | 99.9 | - |
| security.gdpr | yes | - |
| security.iso27001 | yes | - |
| security.soc2 | yes | yes |

## Capabilities (Email Testing Dev)

| Capability | Email on Acid | MailSlurp |
|---|:--:|:--:|
| **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 2026-09-01T16:31:07.313Z. "-" = undocumented, not absent.*