# Email on Acid vs Mailosaur

| Attribute | Email on Acid | Mailosaur |
|---|---|---|
| **Vioscale score** | 58.3 (66% (medium)) | 60.5 (55% (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. | Provides tools for validating emails and SMS messages through dedicated inboxes and phone numbers, with rendering previews across devices and email clients, integration into CI/CD pipelines, and automation via APIs and testing framework support. |
| 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}` | `{"sms_testing":true,"api_assertions":true,"spam_score_check":true,"ci_cd_integration":true,"rendering_preview":true,"multi_user_inboxes":true}` |
| integrations.count | - | 20 |
| integrations.list | - | `[{"name":"Selenium"},{"name":"Playwright"},{"name":"Cypress"},{"name":"TestCafe"},{"name":"WebdriverIO"},{"name":"Cucumber"},{"name":"Robot Framework"},{"name":"Ghost Inspector"},{"name":"Postman"},{"name":"Insomnia"},{"name":"PowerShell"},{"name":"Node.js"},{"name":"Java"},{"name":"Python"},{"name":"Ruby"},{"name":".NET"},{"name":"PHP"},{"name":"Go"},{"name":"JavaScript"},{"name":"Okta"},{"name":"Microsoft Entra"}]` |
| market.availability | `{"primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"hqCountry":"GB","primaryMarkets":["GB","US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"web":true}` | `{"cli":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"]}` | `{"type":"subscription","plans":[{"free":false,"name":"Personal","summary":"$20/month (billed annually)","features":["Email compatibility testing","API for test automation","Forward emails to external addresses"],"minSeats":1,"components":[{"kind":"fixed","amount":20,"period":"month","currency":"USD"}],"description":"For individuals requiring email testing essentials","contactSales":false,"includedLimits":{"users":"1 (support for up to 3)","inboxes":"1","emails_per_month":"15,000"}},{"free":false,"name":"Core","summary":"$50/month (popular)","features":["Team access","Multiple inboxes","Email accessibility testing","Mail rules","POP3/IMAP connectivity","SMS support"],"minSeats":5,"components":[{"kind":"fixed","amount":50,"period":"month","currency":"USD"}],"description":"Collaborative testing scaled for teams","contactSales":false,"includedLimits":{"users":"5 seats","emails_per_month":"75,000"}},{"free":false,"name":"Enterprise","features":["Custom users and inboxes","SSO (SAML2/OIDC)","Separate permissions","Enterprise security","Account manager","Advanced support with SLAs"],"contactSales":true}],"addOns":[{"name":"SMS and authentication","components":[{"kind":"fixed","amount":37.5,"period":"month","currency":"USD"}]},{"name":"Email previews","components":[{"kind":"fixed","amount":25,"period":"month","currency":"USD"}]}],"summary":"From $20/month (billed annually). Free 14-day trial.","currency":"USD","freeTier":false,"sourceUrl":"https://mailosaur.com/pricing","retrievedAt":"2026-08-25T12:08:17.001Z","freeTrialDays":14,"startingPrice":{"amount":20,"period":"month","currency":"USD"},"billingPeriods":["month","year"]}` |
| pricing.free_tier | no | no |
| pricing.model | commercial | commercial |
| pricing.price_level | high | mid |
| pricing.starting_price | `{"amount":99,"currency":"USD"}` | `{"amount":20,"currency":"USD"}` |
| pricing.transparent | yes | yes |
| reliability.sla_pct | 99.9 | - |
| security.disclosure_policy | - | yes |
| security.gdpr | yes | yes |
| security.iso27001 | yes | yes |
| security.pci | - | yes |
| security.soc2 | yes | - |

## Capabilities (Email Testing Dev)

| Capability | Email on Acid | Mailosaur |
|---|:--:|:--:|
| **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 2026-09-01T17:22:35.052Z. "-" = undocumented, not absent.*