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GNUnet vs I2P: catalog facts
GNUnet	I2P
Free Free software from the GNU project with no paid tier.	Free The open-source software is available without a license fee.
Linux	Windows, macOS, Linux, Android
Designed to protect metadata, not only message content Backed by academic research	Every node relays, so the anonymity set grows with participation Built-in anonymous email, torrenting and site hosting
A protocol stack and framework rather than a polished end-user app Technical to install and understand	Slow, and reaching the ordinary internet needs an outproxy Smaller network and fewer services than Tor
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
No account 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 23, 2026	Official website Full listing and sources Checked September 22, 2026

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