# Mailosaur vs MailSlurp

**Leader by Vioscale score:** Mailosaur

| Attribute | Mailosaur | MailSlurp |
|---|---|---|
| **Vioscale score** | 60.5 (55% (medium)) | 49.5 (54% (medium)) |
| deployment.options | `{"cloud":true}` | `{"cloud":true}` |
| description.long | 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. | 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 | `{"sms_testing":true,"api_assertions":true,"spam_score_check":true,"ci_cd_integration":true,"rendering_preview":true,"multi_user_inboxes":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 | 20 | 8 |
| 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"}]` | `[{"name":"Zapier"},{"name":"Gmail"},{"name":"Outlook"},{"name":"Dropbox"},{"name":"Google Drive"},{"name":"Playwright"},{"name":"CypressJS"},{"name":"ACCELQ"}]` |
| market.availability | `{"hqCountry":"GB","primaryMarkets":["GB","US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | - |
| platform.support | `{"cli":true,"web":true}` | `{"web":true}` |
| pricing | `{"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"]}` | `{"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 | mid | low |
| pricing.starting_price | `{"amount":20,"currency":"USD"}` | - |
| pricing.transparent | yes | no |
| security.disclosure_policy | yes | - |
| security.gdpr | yes | - |
| security.iso27001 | yes | - |
| security.pci | yes | - |
| security.soc2 | - | yes |

## Capabilities (Email Testing Dev)

| Capability | Mailosaur | 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 2026-09-01T16:58:00.931Z. "-" = undocumented, not absent.*