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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.
| ZeroBouncezerobounce.net | Mail-Testermail-tester.com | Formspreeformspree.io | MailerLitemailerlite.com | |
|---|---|---|---|---|
| What it does | Checks a mailing list for dead, catch-all and spam-trap addresses before you send | Send one email to the address it gives you and get a spam score out of ten | Gives a static site's contact form somewhere to POST that emails you the answers | Sends a newsletter to a small list on a free tier that does not expire |
| 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 | The free allowance is a small number of monthly credits and needs a verified account; a real list clean is a paid job. | Three tests per 24 hours from one address, and the score grades your configuration rather than predicting real inbox placement. | Free takes 50 submissions a month across all your forms and keeps only 30 days of history. | Free stops at 250 subscribers, 2,500 emails a month and three automations, and new accounts are manually reviewed before the first send. |
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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.