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Feature checklists make every tool look equivalent. This table leads with the three things that actually differ — what it costs you before it works, whether your files leave your device, and where the free version stops.
| Mailinatormailinator.com | Mail-Testermail-tester.com | Mailtrap Email Testingmailtrap.io | Formspreeformspree.io | |
|---|---|---|---|---|
| What it does | Any address at mailinator.com already has an inbox you can read without signing up | Send one email to the address it gives you and get a spam score out of ten | Catches the emails your app sends in a fake inbox so no real person gets them | Gives a static site's contact form somewhere to POST that emails you the answers |
| What it costs you | Free tierA genuinely usable free tier with paid plans for volume or team features. | Free tierA genuinely usable free tier with paid plans for volume or team features. | Free tierA genuinely usable free tier with paid plans for volume or team features. | Free tierA genuinely usable free tier with paid plans for volume or team features. |
| Your files | Runs on their server | Runs on their server | Runs on their server | Runs on their server |
| Where it stops | Public inboxes are readable by anyone who guesses the name and messages are purged within hours; private domains, the API and SMS testing are paid. | Three tests per 24 hours from one address, and the score grades your configuration rather than predicting real inbox placement. | The free sandbox is one inbox with a small monthly cap on captured messages, and actually sending mail is a separate paid product. | Free takes 50 submissions a month across all your forms and keeps only 30 days of history. |
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| Category | Email & Communication | Email & Communication | Email & Communication | Email & Communication |
| Last checked | 2026-07-29 | 2026-07-29 | 2026-07-29 | 2026-07-29 |
| Open the site | Open | Open | Open | Open |
This comparison is in the address bar — copy the URL to send it to someone.