Lambda is a free, open-source Minecraft Fabric utility mod focused on advanced automation to execute complex, repeatable tasks with minimal micromanagement. This is a complete, ground-up rewrite of the original client that you can find here: Lambda Legacy.
Find our backup matrix space at #lambda-client:matrix.org.
Warning
Alpha Status: This version of Lambda is a complete rewrite (2+ years in the making) and is currently in an Alpha state. While highly capable, please expect bugs and incomplete features as we progress toward Beta. Old addons are not compatible with this version.
- Build Engine: Full integration with Litematica and schematic files for seamless automated building.
- Block State Handling: The build engine natively supports special block states including rotations, attachments (doors, signs, bells), half-slabs, stairs, repeater delay, and even edge cases like flower pots with plants.
- Conflict-Free Orchestration: A centralized manager system handles all core interactions (placing, breaking, rotating, inventory) to ensure zero conflicts between concurrently running modules.
- High-Speed ESP: Rendering is optimized to handle extreme scenarios—capable of visualizing all obsidian at the 2b2t spawn without dropping frames.
- Modern Framework: Built on modern modding frameworks with efficient rendering pipelines that outperform legacy clients.
- Fine-Grained Control: Access over 1000+ settings, allowing you to tune every aspect of the client to your exact needs.
- Advanced GUI: The Dear ImGui interface is designed for clarity and depth, featuring quick search, context menus, and easy keybind editing.
- Automation Profiles: Use linkable configs to apply complex configurations across multiple modules instantly.
- Anticheat Ready: Built with Grim and other modern anticheats in mind.
- Type-Safe Commands: Uses Minecraft's statically typed command system to ensure input accuracy and reliability.
- HighwayTools: Completely rewritten for efficient infrastructure maintenance.
- Install Minecraft 1.21.5 (download)
- Install Fabric (download)
- Get the latest Lambda version here (download)
- Put the file in your
.minecraft/modsfolder
How do I...
... open the ClickGUI?
Press
Y.
... I execute a command?
Use the ingame chat with the prefix
;.
We need the help of the community to support the growth of this project. Whether that be developers contributing to the codebase, creating addons, or users giving feedback.
If you have any questions, concerns, or suggestions, you can visit our official Discord server.
Lambda is not affiliated with Mojang Studios. Minecraft is a registered trademark of Mojang Studios. Use of the Lambda software is subject to the terms outlined in the license agreement GNU General Public License v3.0.