Alternatives to I2P
Encrypted overlay network for anonymous sites, messaging and file sharing. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
I2P
Encrypted overlay network for anonymous sites, messaging and file sharing.
Replacements
Listings that take over the same core job as I2P.
Lokinet
Onion-routed network built on staked nodes, routing at the IP layer.
Lokinet is a GPL-3.0 onion-routed network on staked nodes that routes at the IP layer with lower latency, but its network and anonymity set are much smaller.
InviZible Pro
Android app bundling Tor, I2P and DNSCrypt with a no-root mode.
InviZible Pro bundles I2P with Tor and DNSCrypt in one Android app with per-app rules and no-root mode, but it is Android only and battery heavy.
Orbot
Tor VPN for Android and iOS that can route chosen apps.
Orbot routes chosen apps on Android and iOS through Tor, a larger network than I2P, but lacks I2P's built-in email, torrenting and site hosting.
Hyphanet
A peer-to-peer network for censorship-resistant, anonymous publishing and communication, formerly known as Freenet.
Hyphanet focuses on censorship-resistant anonymous publishing with a friend-to-friend mode, runs only on desktop, and is slower than the regular web.
GNUnet
A GNU network protocol stack for building secure, decentralised and privacy-preserving peer-to-peer applications.
GNUnet is a Linux-only protocol stack for building metadata-resistant peer-to-peer applications, more technical and less of a ready network.
Yggdrasil
An experimental, end-to-end encrypted IPv6 mesh network run as a lightweight userspace software router.
Yggdrasil is an encrypted IPv6 mesh network on many platforms, still alpha-stage and not designed to hide your IP address.
Also worth comparing
These listings name I2P as their own alternative, so the relationship runs both ways.
i2pd
A full-featured C++ implementation of the I2P router for joining the anonymous I2P network.
I2P is the original Java-based router for the same network, open source, with built-in anonymous email, torrenting and site hosting on Windows, macOS, Linux and Android.
Similar software
Related functionality, not a direct replacement.
Tails
Amnesic live operating system that routes everything through Tor.
Whonix
Two-virtual-machine system that isolates the desktop from the network.
Kodachi
A privacy-focused Debian-based Linux distribution that routes traffic through Tor or VPN.
Mozilla VPN
A paid WireGuard-based VPN service from Mozilla that runs on Mullvad's server network.
Arti
The Tor Project's rewrite of the Tor client in the Rust programming language.
BiglyBT
An open-source, ad-free BitTorrent client built on the former Azureus and Vuze codebase.