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SimpleLogin vs 33Mail: catalog facts
SimpleLogin	33Mail
Freemium Free tier available, with paid plans for more aliases and features; owned by Proton.	Free Free for unlimited aliases on the 33mail subdomain.
Android, Web, Browser extension	Web
Open source alias generation with the backing of Proton Aliases can be disabled individually to stop spam without changing your real address	Unlimited free aliases on the service's subdomain Simple to create a new alias on demand for any signup
Best features and higher alias limits require a paid plan Now tied into the Proton ecosystem after the acquisition	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
Web application, Browser extension	Web application
Open source	Closed 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 Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.