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I2P vs Arti: catalog facts
I2P	Arti
Free The open-source software is available without a license fee.	Free Free and developed by the Tor Project.
Windows, macOS, Linux, Android	Command line
Every node relays, so the anonymity set grows with participation Built-in anonymous email, torrenting and site hosting	Official Tor Project client Written in Rust for memory safety
Slow, and reaching the ordinary internet needs an outproxy Smaller network and fewer services than Tor	No graphical interface; Tor Browser is the easier option for browsing Aimed at technical users
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	Needs internet
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.