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Firefox Relay vs Addy.io: catalog facts
Firefox Relay	Addy.io
Freemium Free tier with a limited number of masks, paid plan for unlimited masks and a custom…	Freemium Free tier available, open source software formerly known as AnonAddy.
Web, Browser extension	Web, Self-hosted, Browser extension
Backed by Mozilla, a long-standing name in browser privacy Simple mask creation directly from the browser	Unlimited aliases available for free Open source, with the option to self-host your own instance
Free tier limits the number of masks available Deeper integration is tied to the Firefox browser ecosystem	Some advanced features are limited on the free tier Requires trusting or self-hosting the forwarding infrastructure
Web application, Browser extension	Web application, Self-hosted, Browser extension
Closed 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 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.