Email on Acid vs Mailosaur
No clear leader: Mailosaur (60.5) and Email on Acid (58.3) are within the 5-point margin; treat as a tie. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.
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.
Email on Acid
Tests email campaigns across 100+ email clients and devices to identify rendering issues, validate content for inbox compatibility, check accessibility compliance, and detect deliverability problems before sending.
Mailosaur
Provides tools for validating emails and SMS messages through dedicated inboxes and phone numbers, with rendering previews across devices and email clients, integration into CI/CD pipelines, and automation via APIs and testing framework support.
Pricing
List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.
Email on Acid
From $99/month. 7-day free trial.
- Basic$99/month, $0.15 per preview overage
- 1,000 email previews per month
- 100+ email preview clients and devices
- Unlimited users
- API access
- Overage charges for additional previews
- Premium$199/month
- 2,000 email previews per month
- 100+ email preview clients and devices
- Unlimited users
- Accessibility tests (WCAG 2.2 / European Accessibility Act compliance)
- HTML code analysis
- +2 more
- CustomContact sales
- Custom preview allotments
- Phone and chat support
- Dedicated support documentation
Mailosaur
From $20/month (billed annually). Free 14-day trial.
- Personal$20/month (billed annually)
- Email compatibility testing
- API for test automation
- Forward emails to external addresses
- Core$50/month (popular)
- Team access
- Multiple inboxes
- Email accessibility testing
- Mail rules
- POP3/IMAP connectivity
- +1 more
- EnterpriseContact sales
- Custom users and inboxes
- SSO (SAML2/OIDC)
- Separate permissions
- Enterprise security
- Account manager
- +1 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.
Email on Acid
Not documented yet.
Mailosaur
- 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
Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.