Inertia Anti Cheat
Players who run a server that should keep unwanted mods out can use Inertia Anti Cheat, which checks each joining client's mod list against a configurable blacklist or whitelist.
What it does
When a player joins, the server mod sends a request for the client's mod list. The client mod answers the request, and the server compares the list against a configurable blacklist or whitelist of hashes. A player whose mod list is not acceptable is kicked. The check is meant as a short, low-effort barrier that stops most casual cheaters from joining, not as a full defense against determined ones.
The mod is named after, and heavily inspired by, Inertia, the anti-cheat it draws from. It also covers resource packs: it flags resource packs such as X-ray packs that give an advantage. Players who need an anti-Xray mod must install one themselves, since Inertia Anti Cheat does not supply it. Because the check runs on every joining client, server owners can use it with modpacks as well as single mods. The mod requires Fabric API on Fabric and Quilt, and it is released under the GNU General Public License v3.0 only, so the code is open source.
Key features
Mod list check on join
The server requests each joining client's mod list and compares it against the configured rules before admitting the player.
Blacklist and whitelist
Server owners choose whether listed mods are refused or whether only listed mods are allowed, and edit the list in a configuration file.
Resource pack check
Resource packs are checked as well, so advantageous packs such as X-ray packs can be caught at the moment they are loaded.
Kick for unacceptable lists
A player whose mod list fails the rules is disconnected from the server with a message.
Gallery
Compatibility
Latest build for each game version and loader.
1.21.x11 of 11 versions with builds
1.20.x7 of 7 versions with builds
1.19.x5 of 5 versions with builds
1.18.x3 of 3 versions with builds
1.17.x2 of 2 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Who it’s for: Server owners who want to screen joining players by their installed mods, and who accept that the check is a light barrier rather than a complete one.
How it compares
Inertia Anti Cheat is a Fabric and Quilt mod with a Client and server environment, released under the GNU General Public License v3.0 only and open source. Poime's Mod Checker is a Fabric mod for 1.21.4 with the same Client and server environment, open source under the MIT License. Cheat Like Defnot is open source under the MIT License and runs on Fabric and Quilt for 1.18.2 – 1.21.1, with the server required and the client optional.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Inertia Anti Cheat | Fabric and Quilt | 1.17 – 1.21.11 | Client and server | 2025-12-11 |
| Poime's Mod Checker | Fabric | 1.21.4 | Client and server | 2025-05-26 |
| Cheat Like Defnot | Fabric and Quilt | 1.18.2 – 1.21.1 | Server required, client optional | 2024-09-19 |
Questions
Does the server need Inertia Anti Cheat only, or does Fabric API matter?
Do players need the mod installed to join?
Does Inertia Anti Cheat block X-ray resource packs?
In the catalog
Inertia Anti Cheat is one of 8,016 Management mods on ModsFinder, and one of 5,930 Management mods for Fabric. 19,862 mods support Minecraft 1.21.11.
Similar mods
What the author says
When someone joins your server, the server mod will ask for the client's mod list. If the client does not respond to this request (most likely because the client mod is not installed), the server will kick the player.
Official listing
- Modrinth page
- modrinth.com/mod/inertiaanticheat
- Owner
- DiffuseHyperion
- Published
- 2023-05-18
- Updated on Modrinth
- 2025-12-11
- Facts verified
- 2026-10-15