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MIT Licensed · Community Edition

Keyverse,
open and free.

The same focused Minecraft Java launcher — clone it, build it, fork it. Zero telemetry, zero paywalls, zero black boxes. Just source code.

View on GitHub Build it yourself

$ git clone https://github.com/ahtilol/keyverse && cd keyverse && npm ci && npm run dev

MIT

License

v1.4.15

Latest

Build targets

Telemetry

KEYVERSE

Created & maintained by the owners & lead developers:

Ahti Owner & Developer

Kiki Owner & Developer

OPEN SOURCE / EVERY LAYER

The whole launcher.
In plain sight.

Trace the journey from one click to a running world. Explore the interface, process events, downloads, cloud appearance lookup, and local data in the source.

Professional live console with saved themes
Shared game, server, and KeyClient preferences
Exact Fabric builds with the Forge port clearly marked as still in progress
Username-linked skins and capes rendered in game
Local file checks and transparent launch state

Explore the architecture ↗

KEYVERSE SOURCE WORKSPACE

01 / INTERFACERenderer

Instances · Studio · Preferences

02 / EVENTSTyped IPC

Progress · Logs · Settings

03 / LOCAL ENGINELauncher core

Java · Files · Process lifecycle

Every event has a source.Inspect. Understand. Contribute.

Philosophy

Why we opened the source.

A launcher touches your Microsoft account, your files, and your game. You deserve to see exactly what it does.

No black boxes

Every network call, every file write, every auth step is visible in plain JavaScript. Nothing is compiled away or hidden behind closed builds.

Fork freely

MIT license — no attribution requirements beyond keeping the copyright. Build your own launcher on top, strip features, add features, redistribute.

Community owned

Pull requests, issues, and forks are welcome. The more eyes on the code, the better the launcher gets for everyone.

What's included

The product, in plain sight.

Explore the launch pipeline, community data model, and creative tools. Cloud services and packaged releases require their own configuration.

Observable launching

Process tracking, live stdout and stderr, crash context, Java selection, and per-instance settings.

Fair Play Guard

Archive safety checks, duplicate mod detection, SHA-256 fingerprints, and managed client integrity repair.

Identity and community

Supabase-backed profiles, friends, channels, roles, messages, and skin/cape profile assets.

Cloud appearance bridge

Authenticated uploads, username and UUID linking, public opt-in lookup, image validation, and in-game KeyClient rendering.

Universal client settings

KeyClient modules, themes, HUD layouts, and editor state are prepared before launch and captured after exit.

Responsive client UI

Compact cards, clean iconography, theme-aware surfaces, smooth motion, and reduced-motion support.

✓

Full profile management

Create, edit, and switch isolated profiles per version and loader. All data stays local.

✓

Microsoft device-code sign-in

MSAL-powered auth. No passwords ever touch Keyverse — sign in via microsoft.com/devicelogin.

✓

Java auto-install

Fetches the right JRE from Adoptium automatically. No manual path configuration.

✓

All loaders — Fabric, Forge, Quilt, NeoForge

Install any supported loader and version directly from the launcher UI.

✓

Discord Rich Presence

Optional, toggleable per profile. Shows version and world. Off by default in OSS builds.

✓

Loader-aware modpacks

Modpack manifests keep their Fabric, Forge, NeoForge, or Quilt loader instead of being forced onto one loader.

–

Signed binary + auto-update

You build and optionally sign your own binary. No update channel — ship it yourself.

Standard release

Profile management

Microsoft sign-in

Java management

All loaders

Loader installers

Discord presence

Signed installer

Auto-update channel

Anonymous usage pings

Open source

Profile management

Microsoft sign-in

Java management

All loaders

Loader installers

Discord presence

Signed installer

Auto-update channel

No telemetry ever

Three commands

Running in minutes.

Node.js 18+ is the only prerequisite. No global tools, no build servers, no accounts.

Clone the repo

Fork on GitHub or clone directly. Dev data writes to ~/.keyverse-dev — never touches your real profiles.

Install dependencies

npm install pulls Electron, MSAL, electron-builder, and discord-rpc. That's the full dependency tree.

Start or build

npm run dev launches with hot-reload and DevTools on port 9229. npm run build packages for your OS.

Target a platform

npm run package:win · package:mac · package:linux — each produces a native installer or AppImage.

TERMINAL bash

# clone
$ git clone https://github.com/ahtilol/keyverse.git
$ cd keyverse
# install
$ npm install
# dev mode (hot-reload + devtools)
$ npm run dev
# production builds
$ npm run package:win    # → .exe installer
$ npm run package:mac    # → universal .dmg
$ npm run package:linux  # → .AppImage + .deb

Unsigned binaries: Windows SmartScreen will warn; macOS requires right-click → Open on first launch unless you sign with your own certificate.

Codebase

Clean, readable, unsurprising.

Plain Electron + Node.js. No custom bundler, no framework magic. If you know JavaScript, you can read the entire codebase in an afternoon.

keyverse/

src/ main/ index.js // entry point launcher.js // spawn java auth.js // MSAL device-code profiles.js // profile CRUD java-manager.js // JRE detect/install renderer/ ui.js // UI logic styles.css // app styles preload/ preload.js // IPC bridge assets/ // icons scripts/ build.js // packaging package.json electron-builder.json README.md CONTRIBUTING.md CHANGELOG.md LICENSE

src/main/

The Electron main process. Handles all privileged operations — file system, child processes, credential storage (keytar), and IPC event registration. Never imports from renderer/.

src/renderer/

Pure UI layer. No direct Node.js access — all communication goes through window.kv.* exposed by preload. If you want to restyle or redesign the UI, this is the only folder you need.

src/preload/preload.js

The security boundary. Exposes a typed window.kv API via contextBridge. nodeIntegration is disabled — no raw Node access from the renderer, ever.

src/main/auth.js

MSAL device-code flow only. No passwords stored, no tokens logged. Credentials saved to the OS keychain via keytar. Removing this file disables Microsoft login entirely — everything else keeps working.

Get involved

Three ways to contribute.

Pick what fits your time. All of it helps.

Issues

Report a bug

Found something broken? Open an issue with your OS, launcher version, and steps to reproduce. Screenshots and logs welcome.

Open an issue

Pull Requests

Send a fix

Fork, branch off main, make focused commits, and open a PR. Bug fixes are merged fast. New features need an issue discussion first.

Open a PR

Discussions

Share an idea

Have a feature in mind? Start a GitHub Discussion. We try to respond to every thoughtful proposal, even if the answer is "not right now."

Start a discussion

Ready?

Clone it. Break it.
Make it yours.

MIT licensed. Three commands to a working launcher. No account, no email, no waiting.

View on GitHub Read the docs

Keyverse,open and free.

The whole launcher.In plain sight.