Maildev vs Mailosaur
On the evidence we track, Mailosaur leads this comparison with a composite score of 61/100. 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.
Maildev
A developer tool that captures and displays incoming emails via SMTP in a web interface, enabling inspection and testing of email delivery during development.
Mailosaur
LeaderMailosaur 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.
Pricing
List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.
Mailosaur
LeaderFrom $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
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.
Maildev
- Claude
- Gmail
Mailosaur
Leader- Selenium
- Playwright
- Cypress
- TestCafe
- WebdriverIO
- Cucumber
- Robot Framework
- Ghost Inspector
- Postman
- Insomnia
- PowerShell
- Node.js
- Java
- Python
- Ruby
- .NET
- PHP
- Go
- JavaScript
- Okta
- Microsoft Entra
Maildev or Mailosaur: 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.