Furnace Client
A Minecraft launcher that skips the wait.
Furnace stages your instances in the background, so the second time you press play it goes almost straight into the game. Mods come from Modrinth without leaving the launcher, and your Microsoft session sits in Windows Credential Manager — not in a plain text file.
Windows 10 and 11 · Free · Open source · No account needed to browse mods
- 1.8.9 through 1.21
- Vanilla + Fabric
- telemetry, analytics, ads
- 0
- Modrinth installs
- One click
- installer size
- ~4.5 MB
Features
Everything a launcher needs. Nothing it doesn't.
Furnace is built around the parts people actually use every day — launching, mods, and knowing where their time went. No dashboards full of numbers you'll never look at.
Repeat launches are quick
Pick a profile and Furnace stages it in the background — files are hash-checked once, then cached. Relaunching skips the file checking and gets you into the game.
Modrinth is built in
Search, install, enable and disable mods from inside the launcher. Results are filtered to your instance's version and loader, and downloads are SHA-1 verified.
Import .mrpack files
Point Furnace at a Modrinth modpack and it makes a new instance from it: files downloaded and checked, overrides unpacked, loader read from the pack.
Groups that stay tidy
Drag instances between groups and drop them exactly where you want them. Collapse groups you're not using. Your layout is remembered between sessions.
Playtime, measured honestly
Active and AFK time are counted separately for both the game and the launcher, per day and per instance. You see what you actually played, not a rounded number.
Sign-in done properly
Sign in with the Microsoft account you already play with. Sessions are kept in Windows Credential Manager, and signing out removes the token from your PC.
Instances
Your instances, in groups that make sense
Make a group for servers, one for modpacks, one for testing — whatever fits. Drag instances between them and drop them exactly where you want in the list. Groups collapse when you're not using them, and the whole layout is saved for next time.
Mods
Browse Modrinth without leaving the launcher
Results are filtered to your instance's exact Minecraft version and loader, with category and sort filters when you want them. Installing pulls the file, checks its SHA-1 hash, and drops it in the instance's mods folder. Toggle mods on and off without deleting anything.
Playtime
Playtime that splits active from AFK
Furnace watches for input and counts the difference, for the game and for the launcher itself. Daily bars, totals per instance, and a session timer while you play — no rounding, no guesses.
Get Furnace
One installer, about 4.5 MB. Furnace handles Java, game files, and mods itself — you just pick a version and press play.
Windows 10 and 11, 64-bit · v0.1.0 preview · Free
The build isn't code-signed yet, so SmartScreen may warn on first run. You can check the installer's hash against the release page, or build it yourself from source.
FAQ
Questions people actually ask
Is Furnace free?
Yes. No paid tier, no ads, and no sign-up just to download the launcher or browse mods.
Which Minecraft versions and loaders work?
Vanilla and Fabric, from 1.8.9 through 1.21. Forge and NeoForge are planned but not shipped yet — if a profile needs them, Furnace says so up front instead of failing halfway through a launch.
Do I need Java installed?
No. Furnace works out which Java version each Minecraft release needs and installs Eclipse Temurin for you if your PC doesn't already have a matching one. You can also point it at a Java build you already trust.
How does Microsoft sign-in work?
You sign in with the same Microsoft account you play Minecraft with, in a sign-in window inside the launcher. The session token goes into Windows Credential Manager and signing out deletes it. Furnace never sees or stores your password.
Can I import modpacks from Modrinth?
Yes. Pick an .mrpack file and Furnace builds a new instance from it — pack files downloaded and hash-checked, overrides unpacked, loader and version read from the pack itself.
Does Furnace send any data anywhere?
No analytics, no telemetry, and no crash uploads. Its network access is limited to what's needed: Microsoft and Xbox Live for sign-in, Mojang for game files, Modrinth for mods, and Adoptium for Java. Launch logs stay on your PC.
Where does it keep my files?
In your Windows app data folder. Every instance gets its own directory for saves, mods, and settings, and you can export a JSON snapshot of your launcher settings to back up or sync yourself.