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33Mail vs SimpleLogin: catalog facts
33Mail	SimpleLogin
Best for: Disposable email forwarder offering unlimited free aliases	Best for: Open-source email alias service that protects your real inbox from spam
Free Free for unlimited aliases on the 33mail subdomain.	Free + paid options Free tier available, with paid plans for more aliases and features; owned by Proton.
Web	Android, Web, Browser extension
Unlimited free aliases on the service's subdomain Simple to create a new alias on demand for any signup	Open source alias generation with the backing of Proton Aliases can be disabled individually to stop spam without changing your real address
Aliases live on 33mail's shared subdomain rather than a custom domain on the free tier Long-running service with a dated interface compared to newer alternatives	Best features and higher alias limits require a paid plan Now tied into the Proton ecosystem after the acquisition
Web application	Web application, Browser extension
Not open source	Open source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Sources for 33Mail 33mail.com Catalog checked September 22, 2026	Official website Full listing and sources Sources for SimpleLogin simplelogin.io f-droid.org/packages/io.simplelogin.android.fdroid Catalog checked September 22, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.