# MailSlurp vs Testmail.app

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

| Attribute | MailSlurp | Testmail.app |
|---|---|---|
| **vioscaleAI score** | 52.3 (54% (medium)) | 69.9 (45% (low)) |
| content.faq | `[{"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}]` | `[{"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 | 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. | 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,"blocklist_deliverability_check":true}` | `{"api_assertions":true,"spam_score_check":true,"ci_cd_integration":true,"rendering_preview":true,"multi_user_inboxes":true}` |
| integrations.count | 8 | 3 |
| integrations.list | `[{"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}]` | `[{"name":"Microsoft Entra ID"},{"name":"Okta"},{"name":"OneLogin"}]` |
| market.availability | - | `{"hqCountry":"CA","primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"web":true}` | `{"web":true}` |
| pricing | `{"type":"free","freeTier":true,"sourceUrl":"https://www.mailslurp.com/compare/litmus-pricing/","retrievedAt":"2026-10-12T16:13:40.324Z"}` | `{"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 | free | freemium |
| pricing.price_level | free | low |
| pricing.starting_price | - | `{"amount":9,"currency":"USD"}` |
| pricing.transparent | no | yes |
| reliability.sla_pct | - | 99.99 |
| reliability.status_page | - | yes |
| security.gdpr | yes | yes |
| security.soc2 | yes | - |
| security.trust_center | https://www.mailslurp.com/compliance/ | https://testmail.app/blog/email-regulatory-compliance-simplified/ |

## Capabilities (Email Testing Dev)

| Capability | MailSlurp | 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 2026-10-16T18:31:12.756Z. "-" = undocumented, not absent.*