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Grim

github.com/GrimAnticheat/Grim Game Servers & Multiplayer Open-source projectOpen source

Detect and block Minecraft cheats with Grim Anticheat, a multithreaded predictive server plugin.

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github.com/GrimAnticheat/Grim
Grim homepage screenshot

About Grim

Grim is an open source anticheat plugin for Minecraft Java Edition servers, distributed as a GitHub repository. It is designed to support the latest Minecraft versions, and the README states support for versions 1.8 through 26.3. It runs on Spigot, Paper, Folia, or Fabric server environments and requires Java 17 or higher. Players connecting through Geyser are fully exempt from the anticheat to prevent false positives.

The README describes the project as feature-complete for the 2.0 open source branch. Bug fixes and enhancements are accepted as pull requests, and the maintainers note that requesting one without sponsoring the work is welcome. A premium version with subscription-based paid checks, such as heuristics, is planned but is not described as available. Using Geyser requires Floodgate on the backend server, and ViaVersion must be installed on the backend server only, not on a proxy such as Velocity or BungeeCord.

Key features

  • Movement simulation engine that replicates possible player movement, including walking, swimming, and knockback
  • Movement checks that cover cobwebs, bubble columns, and riding boats, pigs, and striders
  • Handling of collision and bounding box differences between 1.12 and 1.13+ clients and servers
  • Asynchronous, multithreaded design with movement checks running on the Netty thread
  • Per-player replica of the world built from chunk data, block placements, and block changes
  • Developer plugin API for integrating Grim into other plugins
Best for: Operators of Minecraft Java Edition servers who want an open source anticheat and can meet its Java and server platform requirements.
Good for
  • Open source, with source code available in a public GitHub repository
  • Documented support for Minecraft versions 1.8 through 26.3
  • Geyser players are exempt from checks to reduce false positives
Watch out for
  • Requires Java 17 or higher and a Spigot, Paper, Folia, or Fabric server environment
  • Requires Floodgate on the backend server when Geyser is used, and ViaVersion must not be installed on a proxy
  • A premium version with paid checks is planned but not yet available; the open source branch is described as feature-complete

Grim at a glance

Type
Open-source project
Pricing
Not confirmed. Check the site
Open source
Yes · Source code
Language
English
Last checked
Oct 6, 2026 · Online when checked
Listed
Oct 5, 2026
open sourcegameapi

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Grim FAQ

Which server platforms does Grim support?
The README lists Spigot, Paper, Folia, or Fabric server environments, with Java 17 or higher required.
How does Grim work with a proxy such as Velocity or BungeeCord?
Grim must be installed on the backend server. If Geyser is used, Floodgate must be installed on the backend server. ViaVersion must be installed on the backend server only, and Grim does not support ViaVersion on the proxy.
Is a paid version of Grim available?
A premium version with subscription-based paid checks, such as heuristics, is planned. The README does not state a release date or pricing.
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Listing maintained by Chris McClure and the WebIndexly editors · Updated Oct 12, 2026 · How we rank