MailSlurp vs testmail.app
MailSlurp
mailslurp.comtestmail.app
testmail.appSide by side
| Figure | MailSlurp | testmail.app |
|---|---|---|
| Price from | $19.99/mo | $9/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | Yes |
| Plans published | 9 | 6 |
| Spec score · Email Testing Software | 8.9 (#5) | 8.3 (#9) |
| Headquarters | Saue, Harjumaa, Estonia | Toronto, Canada |
| Integrations | The integrations directory lists 79 items, including SDKs, Playwright, Cypress, Selenium, BrowserStack, Zapier, Power Automate, UiPath, Postman, GraphQL and webhooks. | The maker documents examples for using testmail.app with Cypress, Selenium, and TestCafe, including email OTP testing examples. |
| Licence | The hosted MailSlurp service is proprietary, while public official SDK repositories such as the TypeScript client are MIT licensed. | Terms state that all rights, title and interest in the service, software and code belong exclusively to testmail.app, indicating a proprietary service rather than open-source software. |
| Rating on G2 | 2.0 out of 5 from 2 reviews | 4.3 out of 5 from 3 reviews |
| Security | The security policy says data at rest is encrypted with AES-256, data in transit uses TLS/SSL, and daily backups are stored in AWS S3. | The maker states that HTTPS/TLS is enforced, data is encrypted in transit and at rest, and logins are passwordless. |
| Security controls | The security policy states TLS in transit, AES-256 encryption at rest, AWS RDS/S3 storage, daily backups, VPNs, network ACLs, penetration testing and RBAC. | The security page states TLS 1.2 minimum, TLS 1.3 where supported, encrypted AWS volumes, WAF and DDoS protection, passwordless login and namespace-scoped API keys. |
| Support | The support page offers guides and direct contact for account, billing, delivery, and technical issues. | The maker says support comes from real engineers and that most priority requests are answered within minutes. |
| What it does | MailSlurp provides programmable email addresses, phone numbers, messaging APIs and testing workflows for developers and QA teams. | testmail.app receives, parses, spam-tests and indexes test emails so developers can retrieve them through APIs during end-to-end tests. |
Plans
MailSlurp
- FreeFree
- FreeFree
- Starter$19.99 a month
- Starter$19.99 a month
- Pro$49.99 a month
- Pro$49.99 a month
- Growth$129.99 a month
- Growth$129.99 a month
- EnterprisePriced on request
testmail.app
- FreeFree
- Essential$9 a month
- Pro$29 a month
- Enterprise$89 a month
- Unlimited$269 a month
- CustomPriced on request
In their own words
MailSlurp
MailSlurp provides tools to build, test, and automate email and SMS workflows. Users can create temporary or permanent inboxes and handle messages through APIs, SDKs, SMTP, IMAP, and webhooks. It supports end-to-end tests for scenarios including OTP, MFA, magic links, and load testing, as well as device previews, email audits, and inbox placement checks. Pipelines can route messages and attachments using webhooks, forwarding, and automatic replies. AI extraction can turn emails and attachments such as PDFs and images into structured JSON using prompts, schemas, and OCR. Listed integrations include Playwright, Cypress, Selenium, HubSpot, Braze, Mailchimp, Zapier, and AI assistants through MCP. A REST API and official SDKs cover several programming languages. The free plan has capped allowances, including 500 received emails and 1,000 sandbox sends per month. Starter costs $19.99/mo; custom domains and phone numbers require Pro on Free and Starter plans. MailSlurp is web- and API-accessible.
testmail.app
testmail.app receives, parses, spam-tests, and indexes test emails for automated end-to-end testing. Messages sent to addresses such as `{namespace}.{tag}@inbox.testmail.app` are routed into mailboxes, allowing tests to create addresses and mailboxes dynamically. The service provides simple JSON and GraphQL APIs, with client examples for JavaScript, PHP, Ruby, Python, Go, Bash, C#, and Java. Search includes wildcard queries, live waits for new mail, sorting, pagination, attachments, and SpamAssassin reports. GraphQL adds advanced filters, field selection, and custom sorting unavailable in the simple JSON API. Documented integrations cover Cypress, Selenium, TestCafe, and email OTP testing. New accounts receive a 14-day trial without a credit card, then move to the free plan. Free includes 100 emails monthly and one-day retention. Paid plans start at $9/mo (annual). Hosting uses AWS, with encrypted data and passwordless logins.