# Mailosaur vs MailSlurp

**Leader by vioscaleAI score:** Mailosaur

| Attribute | Mailosaur | MailSlurp |
|---|---|---|
| **vioscaleAI score** | 60.5 (56% (medium)) | 52.3 (54% (medium)) |
| content.faq | `[{"answer":"A testing service that validates email and SMS messages for accessibility standards compliance, rendering consistency across email clients, and delivery quality, with API and SDK support for automated testing. It is indexed under Email Testing Dev.","source":"https://mailosaur.com","question":"What is Mailosaur?","confidence":0.6},{"answer":"Mailosaur is a paid product; published pricing starts at $20 per month. It is sold across 3 plans (Personal, Core and Enterprise). There is no free tier. Prices are published openly on the vendor's own pricing page. Pricing changes often, so verify at source before relying on it.","source":"https://mailosaur.com/pricing","question":"How much does Mailosaur cost?","confidence":0.6},{"answer":"Mailosaur supports the web and iOS. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://mailosaur.com","question":"What platforms does Mailosaur support?","confidence":0.6},{"answer":"We have only confirmed a cloud / SaaS deployment for Mailosaur, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.","source":"https://mailosaur.com","question":"Can Mailosaur be self-hosted?","confidence":0.6},{"answer":"We have confirmed 20 integrations for Mailosaur, including Selenium, Playwright, Cypress, TestCafe, WebdriverIO, Cucumber, Robot Framework and Ghost Inspector, plus 12 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://mailosaur.com","question":"What does Mailosaur integrate with?","confidence":0.6},{"answer":"We have independently confirmed ISO 27001 and GDPR for Mailosaur. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Mailosaur not holding them. Always confirm compliance directly before you rely on it.","source":"https://mailosaur.com/docs/compliance","question":"What security certifications does Mailosaur have?","confidence":0.7},{"answer":"Mailosaur is available worldwide. Its primary markets are the United Kingdom and the United States. The vendor is headquartered in the United Kingdom.","source":"https://mailosaur.com/pricing","question":"Where is Mailosaur available?","confidence":0.75}]` | `[{"answer":"MailSlurp is an email and SMS testing platform providing ephemeral or permanent inboxes and phone numbers for developers to verify sign-ups, OTPs, and notification delivery. It includes email preview across multiple clients, deliverability tracking, and REST APIs for integration into automated test workflows. It is indexed under Email Testing Dev.","source":"https://www.mailslurp.com","question":"What is MailSlurp?","confidence":0.6},{"answer":"MailSlurp offers a free tier, so you can start without paying. Pricing changes often, so verify at source before relying on it.","source":"https://www.mailslurp.com/compare/sendgrid-pricing/","question":"Is MailSlurp free?","confidence":0.6},{"answer":"We have confirmed browser-based access to MailSlurp. That is the extent of what we could verify from public sources, so it may well offer desktop or mobile clients we have not indexed.","source":"https://www.mailslurp.com","question":"What platforms does MailSlurp support?","confidence":0.6},{"answer":"We have only confirmed a cloud / SaaS deployment for MailSlurp, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.","source":"https://www.mailslurp.com","question":"Can MailSlurp be self-hosted?","confidence":0.6},{"answer":"We have confirmed 12 integrations for MailSlurp, including Zapier, Gmail, Outlook, Dropbox, Google Drive, Playwright, CypressJS and ACCELQ, plus 4 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://www.mailslurp.com","question":"What does MailSlurp integrate with?","confidence":0.6},{"answer":"We have independently confirmed SOC 2 for MailSlurp. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as MailSlurp not holding them. Always confirm compliance directly before you rely on it.","source":"https://www.mailslurp.com","question":"What security certifications does MailSlurp have?","confidence":0.48}]` |
| deployment.options | `{"cloud":true}` | `{"cloud":true}` |
| description.long | Mailosaur enables development and QA teams to test emails and SMS messages end-to-end with real-device message previews across email clients and devices. The platform supports test automation through APIs and integrations with popular testing frameworks, eliminating the need for dummy accounts or manual testing. | MailSlurp is a cloud-based service that allows developers to create test email addresses and phone numbers, preview emails on real devices, validate message delivery, extract data from messages, and build automated messaging workflows through REST APIs and SDKs. |
| features.capabilities | `{"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}` | `{"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 | 13 | 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"},{"name":"Mailchimp","native":true,"category":"email_marketing","direction":"inbound"},{"name":"Klaviyo","native":true,"category":"email_marketing","direction":"inbound"},{"name":"HubSpot","native":true,"category":"crm","direction":"inbound"},{"name":"Salesforce","native":true,"category":"crm","direction":"inbound"},{"name":"Cypress","native":true},{"name":"Selenium","native":true}]` |
| market.availability | `{"hqCountry":"GB","primaryMarkets":["GB","US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | - |
| platform.support | `{"web":true}` | `{"web":true}` |
| pricing | `{"type":"subscription","plans":[{"free":false,"name":"Personal","summary":"$20/month billed annually","features":["Unlimited email addresses per inbox","Email compatibility testing","API for test automation","Email forwarding to external addresses"],"minSeats":1,"commitment":"annual","components":[{"kind":"fixed","amount":20,"period":"month","currency":"USD"}],"description":"Email testing essentials for individual developers","contactSales":false,"includedLimits":{"inboxes":"1","users_supported":"3","emails_per_month":"15000"}},{"free":false,"name":"Core","summary":"$50/month","features":["Multiple inboxes with unlimited email addresses","Team access and collaboration","Email accessibility testing","Email forwarding and reply functionality","POP3 and IMAP connectivity","Mail rules and auto-forwarding"],"minSeats":5,"commitment":"monthly","components":[{"kind":"fixed","amount":50,"period":"month","currency":"USD"}],"description":"Collaborative email testing for teams","contactSales":false,"includedLimits":{"seats_included":"5","emails_per_month":"75000"}},{"free":false,"name":"Enterprise","summary":"Custom pricing","features":["Custom user and inbox configuration","Team and project-level permission separation","Single Sign-On (SAML2 and OIDC)","Enterprise security features (SCIM, custom session timeouts)","Dedicated account manager","Advanced support with SLAs","Custom contract terms","International phone number support"],"description":"Custom solution for large organizations","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. 14-day free trial available.","currency":"USD","freeTier":true,"sourceUrl":"https://mailosaur.com/pricing","retrievedAt":"2026-10-12T16:12:31.012Z","freeTrialDays":14,"startingPrice":{"amount":20,"period":"month","currency":"USD"},"billingPeriods":["month","year"]}` | `{"type":"free","freeTier":true,"sourceUrl":"https://www.mailslurp.com/compare/litmus-pricing/","retrievedAt":"2026-10-12T16:13:40.324Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | freemium | free |
| pricing.price_level | mid | free |
| pricing.starting_price | `{"amount":20,"currency":"USD"}` | - |
| pricing.transparent | yes | no |
| security.certifications | `[{"name":"ISO 27001:2022","level":"2022","status":"active"}]` | - |
| security.disclosure_policy | yes | - |
| security.gdpr | yes | yes |
| security.iso27001 | yes | - |
| security.pci | yes | - |
| security.soc2 | - | yes |
| security.trust_center | https://mailosaur.com/security | https://www.mailslurp.com/compliance/ |

## 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: vioscaleAI. Generated 2026-10-16T20:39:21.565Z. "-" = undocumented, not absent.*