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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.
| SimpleLoginsimplelogin.io | Proton Mailproton.me | Formspreeformspree.io | Mail-Testermail-tester.com | |
|---|---|---|---|---|
| What it does | Gives every service its own email alias so you can cut one off without moving | Encrypted mailbox where the provider cannot read the contents of your messages | Gives a static site's contact form somewhere to POST that emails you the answers | Send one email to the address it gives you and get a spam score out of ten |
| 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 | Free is ten aliases and one mailbox; unlimited aliases, custom domains and starting new mail from an alias need the paid tier. | Free gives one address, 1 GB of storage and 150 messages a day, and mail to non-Proton users is only encrypted if you take an extra step. | Free takes 50 submissions a month across all your forms and keeps only 30 days of history. | Three tests per 24 hours from one address, and the score grades your configuration rather than predicting real inbox placement. |
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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.