Guide
Is Horizon Launcher Safe? File Checks and Open Source Proof
How to judge Horizon Launcher safety like a reviewer: open source code under MIT, published harness results, a launcher that prepares files locally, and the checks this site runs per build.
CONTENTS On this page
Safe is a claim anyone can type. This guide shows the evidence trail behind the build from horizon launcher Apk: what is public, what is testable, what happens to your files, and the routine this site runs before any download button goes live.
Open code, published proof
Horizon is free and open source under the MIT licence, maintained in the open by the Horizon Rust project. Its central claim, that the rewrite behaves like vanilla, is not a slogan: 281 differential harnesses compare its output with the real client and server, and the project publishes where each subsystem stands.
Open code does not automatically mean safe software, but it changes who can check. Anyone with the skill can read exactly what the launcher and client do, which is a stronger position than trusting a closed binary and a promise.
Your files stay on your device
The launcher prepares game resources locally from your own copy of Minecraft Java Edition. Horizon contains no game assets of its own, downloads none from unofficial mirrors, and your saves never leave the vanilla format or your phone for the launcher to do its job.
That architecture removes whole categories of worry by design. the prepare guide walks the prepare step itself, and seeing how little moves is the most reassuring part of the process.
The checks this site runs per build
Every build published here is installed and played on our own Android phones first: install flow, prepare run, fresh world, upgraded older world, both renderers, touch and controller sessions, and an update in place over the previous build.
If a build fails a step, it waits. The full routine is published on our review page, because a safety claim you cannot inspect is just marketing with better manners. the step by step install guide applies the same evidence habit to choosing a download source for any launcher.
Tested on our own Android phones with the current build, like every guide on this site. If a step behaves differently on your device, tell us through the contact page and the guide gets corrected, not defended.
Quick Answers
Is Horizon Launcher open source?
Yes. Horizon and its launcher are published under the MIT licence by the Horizon Rust project, with code and harness results in the open.
Does the launcher upload my worlds or files?
No. Preparation happens locally on your device from your own Minecraft files, and saves stay in vanilla format on your phone.
How is the game checked against real Minecraft?
With 281 differential harnesses comparing Horizon output against the vanilla client and server across every subsystem.
How does this site check builds?
Each build is installed and played on our own phones: install, prepare, both renderers, worlds old and new, controls, and in place updates.