ONE-CLICK START
OUT-OF-THE-BOX OPTIMIZED PROFILE
Ready-to-use optimized profile out of the box. JVM, memory (heap) settings, and mod selection are pre-configured for your hardware.
KEPLER
Optimization-focused Minecraft client. Initially supports Minecraft 1.21.x with Fabric.
Currently in private testing
Works on
Windows
Linux
macOS
Fabric
Forge
NeoForge
Windows
Linux
macOS
Fabric
Forge
NeoForge
Interface & Calibration
Experience the launcher interface and see automatic calibration across candidate profiles live.
Kepler Client
Minecraft 1.21.x · Fabric
Official sources
Hardware Calibration
Click the button to start calibration
Profile A
Profile B
Profile C
Profile D
Demonstration only: not actual benchmarking.
Features
TAILORED TO YOUR HARDWARE
CALIBRATION FOR YOUR HARDWARE
In-launcher 2‑3 minute calibration tests 3-4 candidate profiles and selects the winning profile for your hardware.
MODRINTH POWERED
EXTENSIVE MOD CATALOG
Mod catalog starting with Modrinth. Mod compatibility is checked for your game version directly via Modrinth.
AUTOMATIC JAVA
CORRECT JAVA AUTOMATICALLY
The correct Java version is automatically selected from Mojang's version manifest. Mods and Java are downloaded from official sources; Kepler does not distribute modded game packages.
How it works
1
Choose your version
Select Minecraft 1.21.x with Fabric.
2
Run calibration (2‑3 min)
Run the 2‑3 minute calibration testing 3-4 candidate profiles on your hardware.
3
Play
Start playing with the winning profile determined for your hardware.
Can my system run it?
Windows
Linux
macOS
Fabric
Forge
NeoForge
Windows, macOS, Linux, Fabric, Forge, and NeoForge are trademarks of their respective owners, used here solely to describe compatibility.
Balanced profile
Profile offering smooth gameplay and balanced settings
Kepler for you:
- tests a smooth and balanced profile
- optimizes mid-range memory settings
- aims to provide stable gameplay
This is sample guidance, not an actual benchmark; your real profile is chosen via calibration.
Who it's for
Those seeking a profile tuned to their hardware
Calibration automatically selects the winning profile for your hardware.
Modded players
Mod compatibility is checked directly for your chosen game version via the Modrinth catalog.
Those who just want to play without setup hassle
The correct Java is selected automatically; you start with an out-of-the-box optimized profile.
Roadmap
Now
Private Testing
Currently in private testing with Minecraft 1.21.x on Fabric.
Next
Expanded Version Support
Additional game versions and alternative mod loaders are planned.
Target
Public Release
Following comprehensive testing, Kepler will be made available to everyone.
Latest Updates
Kepler name and logo announced
The project has been named Kepler Client; the hexagonal star emblem (the project was previously called Pulsar) and logo set were created.
Kepler is currently in private testing. It will be open to everyone after testing.
Downloads are not yet available.
Out-of-the-box optimized profile, automatic Java, extensive mod catalog. It will be here once tests conclude.