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GNUnet vs Katzenpost: catalog facts
GNUnet	Katzenpost
Free Free software from the GNU project with no paid tier.	Free Free and open-source software.
Linux	Self-hosted, Command line
Designed to protect metadata, not only message content Backed by academic research	Protects metadata, not just message content Uses post-quantum cryptography
A protocol stack and framework rather than a polished end-user app Technical to install and understand	A research project aimed at technical users Running a useful network requires several operators and nodes
Downloadable app	Self-hosted
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 October 2, 2026

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