Compare software

33Mail vs Addy.io: catalog facts
33Mail	Addy.io
Best for: Disposable email forwarder offering unlimited free aliases	Best for: Open-source email alias service that forwards anonymous addresses to your inbox
Free Free for unlimited aliases on the 33mail subdomain.	Free + paid options Free tier available, open source software formerly known as AnonAddy.
Web	Web, Self-hosted, Browser extension
Unlimited free aliases on the service's subdomain Simple to create a new alias on demand for any signup	Unlimited aliases available for free Open source, with the option to self-host your own instance
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	Some advanced features are limited on the free tier Requires trusting or self-hosting the forwarding infrastructure
Web application	Web application, Self-hosted, 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 Addy.io addy.io Catalog checked September 22, 2026

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