Detect and block Minecraft cheats with Grim Anticheat, a multithreaded predictive server plugin.
Open source
24 alternativesGrimAC
Protect Minecraft servers from known client-side exploits with the Grim Anticheat plugin.
About GrimAC
GrimAC is an open-source anticheat plugin for Minecraft: Java Edition servers. It compares player actions against a per-player simulation of movement and world state, with latency and inventory compensation, and includes a developer API for integration with other plugins.
It supports Minecraft versions 1.8-1.21 and lists Paper, Spigot and Folia as currently supported, with Java 17 required. Bedrock players connecting through Geyser are fully exempt, and ViaVersion and Floodgate need to be on the backend server when used. The 2.0 open-source branch is described as feature-complete, with a subscription-based premium version planned for additional checks.
Key features
- Simulates player movement including swimming, knockback, cobwebs and bubble columns
- Tracks riding entities such as boats, pigs and striders
- Maintains per-player world replica from chunk and block packets
- Queues world changes until they reach player for latency compensation
- Tracks player inventory to reduce errors at high latency
- Provides developer API to integrate Grim into other plugins
Best for: Server operators running supported Paper, Spigot or Folia servers on Minecraft 1.8-1.21 who want an open-source anticheat.
Good for
- Licensed GPL-3.0-or-later with source code available
- Supports Minecraft versions 1.8 through 1.21
- Movement checks run asynchronously on the netty thread
Watch out for
- Requires Java 17
- Bedrock players connecting through Geyser are fully exempt
- Floodgate and ViaVersion must be on the backend server, not the proxy
GrimAC at a glance
- Website
- modrinth.com/plugin/grimac
- Category
- Gaming › Game Servers & Multiplayer
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
GrimAC alternatives
Tools and sites you could use instead, ranked by how closely they match.
Browse and download Minecraft plugins for your server through the Hangar plugin directory.
ViaVersion lets Minecraft clients connect across multiple server versions through a family of compatibility projects.
GeyserMC lets Minecraft Bedrock Edition clients join Java Edition servers through a compatibility program.
Server.pro hosts game servers with mod and plugin support, offering plans across different server types.
Free trial
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Titanfall 2 server browsing and custom scripts are supported by Northstar, a modding framework client.
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GrimAC FAQ
Which Java version and server platforms are required?
Java 17 is required. The installation notes list Paper, Spigot and Folia as currently supported.
How does Grim handle Geyser/Bedrock players?
Geyser players are fully exempt. Place Floodgate on the backend server so Grim can exempt them; it cannot access Floodgate on a proxy.
Where should ViaVersion be installed?
ViaVersion should be on the backend server because movement handling depends on client version.
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