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Addy.io vs 33Mail: catalog facts
Addy.io	33Mail
Freemium Free tier available, open source software formerly known as AnonAddy.	Free Free for unlimited aliases on the 33mail subdomain.
Web, Self-hosted, Browser extension	Web
Unlimited aliases available for free Open source, with the option to self-host your own instance	Unlimited free aliases on the service's subdomain Simple to create a new alias on demand for any signup
Some advanced features are limited on the free tier Requires trusting or self-hosting the forwarding infrastructure	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, Self-hosted, 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.