⚡
Lightning fast
Optimised startup and low RAM usage so you get into the game in seconds.
v1.0.0 is out now
The next generation
The next generation
Minecraft launcher
Fast, lightweight and secure. Launch your favourite versions and mods with one click.
1.8 – 1.21+Supported versions
Fabric · ForgeMod loaders
5Languages
100%Free
1.21.4 · Fabric
PLAY
Features
Why Nucleos?
Everything you need, nothing you don't.
🧩
Mod support
Fabric, Forge and OptiFine — install and manage mods with one click.
🛡️
Secure
Official Microsoft login. Your password never touches our servers.
🎨
Modern design
A clean, beautiful interface with themes you can customise.
👥
Multiple accounts
Switch between your accounts instantly without logging out.
🌍
Multi-language
Available in English, Turkish, Russian, Bulgarian and Spanish.
Get started
Up and running in 3 steps
1
Download
Click the download button and save the installer.
2
Install
Open Nucleos-Client-Setup.exe and follow the setup wizard.
3
Play
Log in with your Microsoft account, pick a version and hit Play.
💡
If Windows shows "Windows protected your PC", click "More info" and then "Run anyway".
Download Nucleos Client
Choose your operating system and start playing.
Version: 1.0.0 · Free & safe
FAQ
Frequently asked questions
Is Nucleos Client free?
Yes, Nucleos Client is completely free.
Do I need an original Minecraft account?
Yes. You log in with your official Microsoft account to play.
Is it safe?
Yes. Login is done directly through Microsoft and we never see your password.
Which versions are supported?
All popular versions from 1.8 up to the latest release, including Fabric and Forge.
Windows says the file is unrecognised. Why?
New apps without a paid code-signing certificate show this warning. Click "More info" → "Run anyway".