Native mod by JustKarkat

Cross Version

Allows version hopping offline.

1 star on GitHub1.2k downloadsVersion 0.8.0MIT

Made by JustKarkat. Its authors own it and answer for it. Not made or endorsed by the Horizon project. Mod policy

Join servers that speak an older Minecraft protocol from Horizon (which speaks only 26.3's), as a native mod.

When you join, it asks the server which version it speaks. If it isn't 26.3, it starts a ViaProxy on a loopback port and sends the join through it: the proxy speaks 26.3 to Horizon and the server's own version to the server. A join to a 26.3 server starts nothing.

Offline-mode servers only: online-mode servers can't be joined.
The server list shows such servers as joinable, with their own version, instead of "Incompatible version!".
Edit Server and Direct Connect get a line to choose the version yourself (auto, 1.8 to 1.21.4, 26.3), for servers whose status reports the wrong one.
Needs Java 17 or later on your computer. On first use it downloads ViaProxy (GPL-3.0), checked against a SHA-256 pinned in its source.

Native code

A native mod is Rust code that the launcher compiles into a game of its own, the Native mods instance. It is not sandboxed: it can do anything you can on this computer. The launcher builds it only after a warning that names it, and a reviewer read its source before it was listed. Read the source yourself before you build it. How native mods work

Versions

0.8.02026-11-03 · for Minecraft 26.3 · made on Horizon 07b7ea3
Builds on every Horizon with native hook points v80
Offline mode only.
0.7.12026-11-02 · for Minecraft 26.3 · made on Horizon 07b7ea3
Builds on every Horizon with native hook points v80
Version: 0.7.1 Changelog: The MIT notice now ships inside the .hnmod (it is the header of the bundled engine source). The settings page's 'Delete the downloaded ViaProxy' deletes the jars only, so the account added to ViaProxy and its refresh token in saves.json stay. Also: a version switch on Edit Server and Direct Connect: choose what version ViaProxy tells that server it is (auto, 1.8, 1.9, 1.12.2, 1.16.5, 1.20.1, 1.21.1, 1.21.4, 26.3), kept per address, for servers whose status reports the wrong version.

Download0.8.0 · 18 KB

From a terminal or an agent

horizon-launcher mods install --source horizon crossversion

In the launcher

Open Mods, pick Horizon beside Modrinth, find Cross Version and press Install. It checks the file's checksum and signature first.

By hand

Download crossversion-0.8.0.hnmod with the button above, check its SHA-256 against the one under File, and unzip it into a folder, then build the game with it: horizon-launcher native-build FOLDER --trust-native-code. It plays in the Native mods instance.

File

Name: crossversion-0.8.0.hnmod
Size: 18 KB
SHA-256: 5b371f1b7b3582e0c92aa1dc22b491b50c024fe95833aa2bd9457189631caafd
Signing key: RWTcPJHJYjPW0pV3lPwr45crCu0wJxW5HbDLc3fr3Eom1TzxO++kHOo4

Publisher

Published by: @JustKarkat
Signature: Signed: every file is signed with the author's key

Rating

Checking…

Native code

Versions

0.8.02026-11-03 · for Minecraft 26.3 · made on Horizon 07b7ea3
Builds on every Horizon with native hook points v80
Offline mode only.
0.7.12026-11-02 · for Minecraft 26.3 · made on Horizon 07b7ea3
Builds on every Horizon with native hook points v80
Version: 0.7.1 Changelog: The MIT notice now ships inside the .hnmod (it is the header of the bundled engine source). The settings page's 'Delete the downloaded ViaProxy' deletes the jars only, so the account added to ViaProxy and its refresh token in saves.json stay. Also: a version switch on Edit Server and Direct Connect: choose what version ViaProxy tells that server it is (auto, 1.8, 1.9, 1.12.2, 1.16.5, 1.20.1, 1.21.1, 1.21.4, 26.3), kept per address, for servers whose status reports the wrong version.