Kalcium Client
Kalcium Client is a Fabric utility client aimed at players who want a focus-oriented PvP and streaming setup, with a mod menu and a HUD.
What it does
Kalcium Client is described by its author as a Fabric-based utility client built around PvP focus, streamer presets and performance options. Its mod menu lists the features it groups together. A key combination (Left Shift with the left modifier) opens a mod HUD, and an option returns the interface to Minecraft's original layout, so players who dislike the client's UI changes can switch back without removing their favorite mods.
The mod runs on the client only, so players install it themselves and a server does not need it. Files exist for Fabric and 1.21.11 only, with 2.5+1.21.11 as the latest file, published on 2026-09-13. The first file dates from 2026-08-18. The author lists compatibility with many other mods. The code is not open source; it is released under All rights reserved.
Key features
Focus presets
Presets aimed at PvP, streaming and performance let players switch between groups of settings from one menu.
Mod menu
A mod menu collects the client's options and the other mods it works alongside in a single screen.
Mod HUD shortcut
Holding Left Shift with the left modifier key opens the mod HUD from anywhere in the game.
Original interface option
A switch restores Minecraft's original user interface, keeping the favorite mods in place.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
PvP sessions
Players who fight on servers can use the focus presets to keep their HUD and settings uncluttered during combat.
Streaming
Streamers can apply the streamer preset to arrange the client for recording and broadcasting.
Who it’s for: Players on the Fabric loader with 1.21.11 who want a single client for PvP focus, streaming and performance settings. Only the client needs the mod.
How it compares
Kalcium Client is client-side only, not open source, and released under All rights reserved for 1.21.11 on Fabric. ZenCraft is also client-side only and not open source, with files for 1.21.11 on Fabric and NeoForge under the MIT License. Configurable Mute On Focus Lost is client-side only and open source under the MIT License, covering 1.21.4 – 1.21.11 on Fabric.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Kalcium Client | Fabric | 1.21.11 | Client-side only | 2026-09-13 |
| ZenCraft | Fabric and NeoForge | 1.21.11 | Client-side only | 2026-05-31 |
| Configurable Mute On Focus Lost | Fabric | 1.21.4 – 1.21.11 | Client-side only | 2026-04-05 |
Questions
Does Kalcium Client need Fabric API?
Does the server need Kalcium Client?
Can the original Minecraft interface be restored?
In the catalog
Kalcium Client is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from ArnavMC-Modrinth
Similar mods
What the author says
Kalcium client is a Fabric-based utility client built and have a mod menu. It also have presents like PVP Focus, Streamers and Performance.
Official listing
- Modrinth page
- modrinth.com/mod/kalcium-client
- Owner
- ArnavMC-Modrinth
- Published
- 2026-08-18
- Updated on Modrinth
- 2026-09-13
- Facts verified
- 2026-10-15