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

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