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Beta · v0.6.3 · Open source

Download Lightrinth
for Windows

An open-source Minecraft launcher that plays your mods, resource packs, shaders and modpacks and keeps them up to date. No ads, no sponsored cards, no intro video, and no sign-in wall.

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v0.6.3 Windows 10 / 11 · 64-bit Open source · GPL-3.0

The Lightrinth launcher: Jump back in with the Sussy Baka instance, Popular packs and Popular mods, the rail on the left, and Get support and account buttons in the title bar
0 adsno banners, ever
0 sponsored cardsnothing promoted
0 accounts requiredoffline play works
0 bundled softwareyou install, you own

Features

Built for people who just want to play

Every feature below exists because a launcher got in the way: an ad in the way, a login wall in the way, a hidden video in the way, or a version list that stopped updating.

Zero bloatware

No ad banners, no "featured" slots, no onboarding video, no upsell modals, no bundled third-party installers. The app opens on your instances and stays there.

Play without signing in

Add an offline account with just a username and press play. Perfect for singleplayer and offline-mode servers — no Microsoft round-trip, no expired token forcing you to log in again.

Dark by default

The launcher opens in its #16181c dark theme, with raised panels for contrast. OLED is still there in Settings when you want pure black.

Every version and modloader

From the oldest releases to the current one, plus Fabric, Quilt, Forge and NeoForge. The version list is pulled fresh from the live metadata mirror, so it never freezes a year behind.

One-click modpacks

Browse thousands of modpacks and install them as a locked instance that updates cleanly. Mods, configs and overrides land in the right folders for you.

Java, handled

Detects installed Java runtimes, tells you when a version needs 8, 17 or 21, and can download the recommended build for you — so new Minecraft versions actually launch.

Folders that stay in sync

Drop jars straight into an instance and they show up in the app with their real name and icon — recognised from Modrinth when possible, read from the jar when not. No rescan button, no stale list.

Bring your worlds along

Import existing instances from ATLauncher, CurseForge, GDLauncher and MultiMC/Prism rather than rebuilding them by hand.

Instance content

Your content, one click away

Open an instance and the content list is filtered by what it actually is. Instances get messy — half your jars came from a modpack, half you dropped in yourself — so the app keeps both halves visible instead of showing a folder count.

  • Clickable filters — Mods, Resource Packs, Shaders, Data Packs, all in one row.
  • Search that works — across the whole instance, not just one page.
  • Handles both naming schemes — projects from the platform and files found on disk end up in the same tab.
  • Live updates — copy a folder of mods in and the list refreshes on its own, in one clean pass.

Download

Get Lightrinth

A single installer, no bundled offers, no "download manager". Uninstall removes the app and leaves your instances where they are.

Windows installer

Installs the launcher and creates a Start Menu entry. Runs on Windows 10 and 11 (64-bit) and uses the WebView2 runtime that ships with Windows.

Version 0.6.3 Windows x64 .exe installer Free · GPL-3.0
Download installer Portable .exe

Not sure which? Take the installer — it adds the shortcuts and the uninstaller.

Install in three steps

  1. Download the installer above.

  2. Run it. Windows may show a SmartScreen prompt.

  3. Play. Import an instance or create a new one.

This build is not code-signed, so SmartScreen says "unknown publisher". Choose More info → Run anyway. It's the same file you can build yourself from source.

Requirements

  • Operating systemWindows 10 or 11
  • Architecture64-bit (x64)
  • RuntimeWebView2 (preinstalled)
  • JavaDetected or installed for you
  • Disk spaceInstances, as always, take the room

Community

Stuck, or looking for people to play with?

The Lightrinth Discord is where builds land first, where a launcher bug gets reported with a log in two minutes instead of an email thread, and where people swap modpacks, shaders and instance setups. It is also where the next release gets argued about before any of it is written.

Join the Discord

Free to join. Support questions are answered in #support, and release notes are posted in #announcements.

FAQ

Questions people actually ask

Is it really free? What's the catch?

Free, and there is no catch to look for. No account, no premium tier, no "unlock more instances" paywall, no advertising network baked into the UI. The source is GPL-3.0 licensed, so you can read it, build it, or fork it.

Do I need a Microsoft account to play?

No. You can add an offline account with nothing but a username and start the game immediately. That covers singleplayer and servers that run in offline mode.

Online (premium) servers verify your session with Mojang, so they do need a real Microsoft account — that's the game's authentication, not ours.

Does it support the newest Minecraft versions?

Yes. The launcher reads the live version metadata instead of shipping a frozen list, so new releases and new loader builds appear as soon as they're published. If a version needs a newer Java runtime than you have, the app tells you and can fetch the recommended one for you.

Can I import my existing modpacks and instances?

Importers are built in for:

  • ATLauncher
  • CurseForge (instance folders)
  • GDLauncher
  • MultiMC / Prism Launcher

Existing realms, worlds and resource packs keep working — instances are plain folders.

Where does it store my stuff?

Instances, accounts and settings live in %APPDATA%\com.modrinth.theseus, separate from the program itself. Updating or uninstalling the launcher doesn't delete them, and you can copy that folder to another machine to move everything at once.

Does the launcher send data anywhere?

It talks to public project APIs to fetch version metadata, project names, icons and modpack files — the same requests the website makes. You never need an account for that.

Optional usage analytics can be switched off in Settings, and no part of your worlds, chat or files is ever uploaded.

How is this different from the launcher it's based on?

Lightrinth is a fork of Theseus, the open-source launcher behind the Modrinth app. On top of that base it drops the promotional spots, the onboarding video and the ad surfaces, ships with the dark theme by default, adds offline accounts, fixes the version list so it stays current, and turns the content counts into clickable filters.

Beyond that, the internals are the upstream project — improvements here can be contributed back.

Windows says the publisher is unknown. Is that bad?

It just means the binary isn't signed with a paid code-signing certificate. If you prefer, build it from source — the repository contains everything needed, and the build is a single command.