Mailosaur vs Testmail.app
On the evidence we track, Testmail.app leads this comparison with a composite score of 70/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.
Capabilities
Feature-by-feature on the axes that matter for email testing dev. “-” means undocumented, not absent.
What each one is
The product in its own terms, so the numbers below have context.
Mailosaur
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.
Testmail.app
LeaderA 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.
Pricing
List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.
Mailosaur
From $20/month billed annually. 14-day free trial available.
- Personal$20/month billed annually
- Unlimited email addresses per inbox
- Email compatibility testing
- API for test automation
- Email forwarding to external addresses
- Core$50/month
- Multiple inboxes with unlimited email addresses
- Team access and collaboration
- Email accessibility testing
- Email forwarding and reply functionality
- POP3 and IMAP connectivity
- +1 more
- EnterpriseContact sales
- 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
- +3 more
Testmail.app
LeaderFree forever (100 emails/month) plus 14-day free trial. Paid plans from $9–$269/month.
- FreeFree
- 100 emails/month
- Unlimited users, email addresses, and mailboxes
- 1 day retention
- Essential$9/month (annual) or $12/month (monthly)
- 10,000 emails/month
- 1-3 days retention
- One random namespace
- Full API access
- Pro$29/month (annual) or $39/month (monthly)
- 50,000 emails/month
- Unlimited custom namespaces
- Visual viewer
- Priority support
- Enterprise$89/month (annual) or $129/month (monthly)
- 1,000,000 emails/month
- Custom retention
- SSO with SAML 2.0 or OIDC
- Enterprise invoicing
- 99.99% uptime SLA
- Plus$269/month (annual) or $299/month (monthly)
- 10,000,000 emails/month
- All Enterprise features
- Unlimited custom domains
- Custom contracts with enterprise compliance support
- SCIM support
Platform & deployment
Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.
Integrations
What each product connects to. Counts come from the vendor's own integration directory where one exists.
- Okta
Mailosaur
- Selenium
- Playwright
- Cypress
- TestCafe
- WebdriverIO
- Cucumber
- Robot Framework
- Ghost Inspector
- Postman
- Insomnia
- PowerShell
- Node.js
- Java
- Python
- Ruby
- .NET
- PHP
- Go
- JavaScript
- Microsoft Entra
Testmail.app
Leader- Microsoft Entra ID
- OneLogin
Mailosaur or Testmail.app: which one depends on you
A composite score cannot know your constraints. Describe them and both get re-weighted against what you actually need, with the evidence behind every position.
Free to run, no account needed to start. How the evaluation works
Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.