Kappa's AntiCheat
by kappader4
Kappa's AntiCheat is a lightweight Fabric and Quilt anti-cheat for server owners, with checks for abnormal movement speed.
What it does
The mod is built for high-performance, large-scale servers and runs server-side only, so players join with vanilla clients and install nothing. Speed checks flag movement that exceeds configured thresholds, and each check can be enabled or disabled and tuned to a server's needs. Violations can trigger a chat warning once a set threshold is reached, or run a command such as kicking or banning the player. Every violation is written to a log file that can feed external dashboards. Builds cover 1.21.5 – 1.21.8 on Fabric and Quilt, and the code is not open source; it is released under All rights reserved.
Key features
Speed check
Flags players whose movement speed is abnormal, using thresholds the server owner sets.
Configurable responses
Warns players in chat past a threshold, or executes a command such as kick or ban against them.
Violation logging
Records every flagged violation to a file, which can be read by external dashboards.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Emotes is an open source Fabric mod under the MIT License that is required on the server but optional on the client, covering 1.20.1 – 1.21.8. PRAXIC AntiCheat is server-side only and open source under the Apache License 2.0, but it only targets 1.21.1. XaiAC is client-side only and not open source, covering 1.21 – 1.21.11.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Kappa's AntiCheat | Fabric and Quilt | 1.21.5 – 1.21.8 | Server-side only | 2025-07-21 |
| Emotes | Fabric | 1.20.1 – 1.21.8 | Server required, client optional | 2025-07-18 |
| PRAXIC AntiCheat | Fabric | 1.21.1 | Server-side only | 2026-09-17 |
| XaiAC | Fabric | 1.21 – 1.21.11 | Client-side only | 2026-04-23 |
Questions
Does Kappa's AntiCheat need to be installed on clients?
In the catalog
Kappa's AntiCheat is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 17,695 mods support Minecraft 1.21.8.
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What the author says
Fully Configurable – Enable/disable checks, customize thresholds, and define commands to execute on violation Execute any command (e.g., /kick %player%, /ban %player%, etc.)
Official listing
- Modrinth page
- modrinth.com/mod/kappas-ac
- Owner
- kappader4
- Published
- 2025-07-07
- Updated on Modrinth
- 2025-07-21
- Facts verified
- 2026-10-15