# Mailosaur vs Testmail.app

**Leader by vioscaleAI score:** Testmail.app

| Attribute | Mailosaur | Testmail.app |
|---|---|---|
| **vioscaleAI score** | 60.5 (56% (medium)) | 69.9 (45% (low)) |
| 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":"A cloud-based email testing service that provides isolated mailboxes accessible via API for automated testing of email deliverability, OTP flows, and end-to-end email validations in CI/CD pipelines. It is indexed under Email Testing Dev.","source":"https://testmail.app/pricing/","question":"What is Testmail.app?","confidence":0.6},{"answer":"Testmail.app offers a free tier, so you can start without paying. Paid plans start at $9 per year. Prices are published openly on the vendor's own pricing page. Pricing changes often, so verify at source before relying on it.","source":"https://testmail.app/pricing/","question":"Is Testmail.app free?","confidence":0.6},{"answer":"We have confirmed browser-based access to Testmail.app. 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://testmail.app/pricing/","question":"What platforms does Testmail.app support?","confidence":0.6},{"answer":"We have only confirmed a cloud / SaaS deployment for Testmail.app, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.","source":"https://testmail.app/pricing/","question":"Can Testmail.app be self-hosted?","confidence":0.6},{"answer":"We have confirmed 3 integrations for Testmail.app, including Microsoft Entra ID, Okta and OneLogin. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://testmail.app/pricing/","question":"What does Testmail.app integrate with?","confidence":0.6},{"answer":"We have independently confirmed GDPR for Testmail.app. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Testmail.app not holding them. Always confirm compliance directly before you rely on it.","source":"https://testmail.app/blog/email-regulatory-compliance-simplified/","question":"What security certifications does Testmail.app have?","confidence":0.7},{"answer":"Testmail.app is available worldwide. Its primary market is the United States.","source":"https://testmail.app/pricing/","question":"Where is Testmail.app available?","confidence":0.5}]` |
| 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. | A programmable email testing service that provides temporary email addresses and mailboxes for automated testing, allowing developers to validate email delivery and functionality without affecting real customers. |
| 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}` | `{"api_assertions":true,"spam_score_check":true,"ci_cd_integration":true,"rendering_preview":true,"multi_user_inboxes":true}` |
| integrations.count | 13 | 3 |
| 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":"Microsoft Entra ID"},{"name":"Okta"},{"name":"OneLogin"}]` |
| market.availability | `{"hqCountry":"GB","primaryMarkets":["GB","US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"hqCountry":"CA","primaryMarkets":[],"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":"subscription","plans":[{"free":true,"name":"Free","summary":"$0/month forever","features":["100 emails/month","Unlimited users, email addresses, and mailboxes","1 day retention"],"components":[{"kind":"fixed","amount":0,"period":"month","currency":"USD"}],"description":"Forever free plan","contactSales":false,"includedLimits":{"emails":"100/month"}},{"free":false,"name":"Essential","summary":"$9/month (annual) or $12/month (monthly)","features":["10,000 emails/month","1-3 days retention","One random namespace","Full API access"],"components":[{"kind":"fixed","amount":9,"period":"month","currency":"USD"}],"description":"For small projects","contactSales":false,"includedLimits":{"emails":"10,000/month","retention":"1-3 days"}},{"free":false,"name":"Pro","summary":"$29/month (annual) or $39/month (monthly)","features":["50,000 emails/month","Unlimited custom namespaces","Visual viewer","Priority support"],"components":[{"kind":"fixed","amount":29,"period":"month","currency":"USD"}],"description":"Most popular plan","contactSales":false,"includedLimits":{"emails":"50,000/month","retention":"1-30 days"}},{"free":false,"name":"Enterprise","summary":"$89/month (annual) or $129/month (monthly)","features":["1,000,000 emails/month","Custom retention","SSO with SAML 2.0 or OIDC","Enterprise invoicing","99.99% uptime SLA"],"components":[{"kind":"fixed","amount":89,"period":"month","currency":"USD"}],"description":"For power users","contactSales":false,"includedLimits":{"emails":"1,000,000/month"}},{"free":false,"name":"Plus","summary":"$269/month (annual) or $299/month (monthly)","features":["10,000,000 emails/month","All Enterprise features","Unlimited custom domains","Custom contracts with enterprise compliance support","SCIM support"],"components":[{"kind":"fixed","amount":269,"period":"month","currency":"USD"}],"description":"Unlimited - best of everything","contactSales":false,"includedLimits":{"emails":"10,000,000/month"}}],"summary":"Free forever (100 emails/month) plus 14-day free trial. Paid plans from $9–$269/month.","currency":"USD","freeTier":true,"sourceUrl":"https://testmail.app/pricing/","retrievedAt":"2026-10-12T15:28:41.272Z","freeTrialDays":14,"startingPrice":{"amount":9,"period":"month","currency":"USD"},"billingPeriods":["month","year"]}` |
| pricing.free_tier | yes | yes |
| pricing.model | freemium | freemium |
| pricing.price_level | mid | low |
| pricing.starting_price | `{"amount":20,"currency":"USD"}` | `{"amount":9,"currency":"USD"}` |
| pricing.transparent | yes | yes |
| reliability.sla_pct | - | 99.99 |
| reliability.status_page | - | yes |
| 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.trust_center | https://mailosaur.com/security | https://testmail.app/blog/email-regulatory-compliance-simplified/ |

## Capabilities (Email Testing Dev)

| Capability | Mailosaur | Testmail.app |
|---|:--:|:--:|
| **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 2026-10-16T18:31:16.612Z. "-" = undocumented, not absent.*