CheatDetector: Client-Side Cheating Detection for Minecraft
If you play on public Minecraft servers, you have probably suspected someone of flying, speeding, or otherwise bending the rules. CheatDetector is a purely client-side module that watches for common cheating behaviors and tells you what it sees. It does not ban anyone and it does not touch the server. It simply gives you information, and that information is worth having when you want to know whether that player who just crossed the map in three seconds is legit.
The mod is explicit about its limits: misjudgments are unavoidable, and anti-cheat determinations are for informational purposes only. Treat it as a diagnostic tool, not a courtroom verdict.
What CheatDetector Actually Checks
The Anti-Cheat module is built to reveal other players' cheating behavior without being detected itself. The core checks cover the classic movement exploits that show up on nearly every anarchy or survival server:
- Flight — detects players hovering or moving through the air without valid support.
- HighJump — flags jump heights beyond vanilla limits.
- Blink — catches flash-style teleporting and position desync.
- NoSlow — spots players who ignore the slowdown from eating, blocking, or using items.
- Speed — identifies movement faster than legitimate sprinting allows.
- GameMode — checks for creative-style behavior on survival servers.
- Velocity — a counter-return check that watches for knockback that never arrives.
Beyond movement, there is a Flag Detector that helps you verify whether you have been flagged by an anti-cheat, based on whether the server pulls you back. That single feature is useful on its own if you run a play style that occasionally trips server-side checks.
Fixes, Compatibility, and Server Anti-Cheats
The Fixes modules exist to stop you from being flagged by bugs in server anti-cheat software. They are not meant to give you an unequal advantage, and using them that way misses the point. The mod includes tweaks aimed at Themis anti-cheat, a Tweakeroo right-click linker fix, and anti-cheat handling for Vulcan, including BadPacket type 1 and type 2, a movement disabler for Vulcan 2.7.5, and the flag detector mentioned above.
Supported Versions and Loader
CheatDetector is built for Fabric, so you will need Fabric Loader and Fabric API on your client. It runs on modern Minecraft releases in the 1.19 through 1.21 range, and configuration is handled through Mod Menu and the Cloth Config API. If you already run a Fabric setup with those two libraries, adding CheatDetector is a drop-in process. Players who prefer a managed setup can grab it through the foxygame.net launcher, where CheatDetector sits in the add-on catalog alongside its dependencies and updates itself whenever a new build lands.
How to Install CheatDetector
Installation is client-side only, and the server never learns the mod is present from the packets you send. Here is the short version of how to install it:
- Install Fabric Loader for your Minecraft version.
- Drop Fabric API, Mod Menu, and Cloth Config into your mods folder.
- Place the CheatDetector jar in the same folder.
- Launch the game and open the module menu to adjust settings.
When you download CheatDetector, make sure you match the build to your exact game version. A mismatched jar will either fail to load or behave unpredictably.
Configuring the Mod for Your Server
CheatDetector ships with over 69 customizable options, which sounds like a lot until you realize how much server conditions vary. The default configuration is tuned for connections under 80ms, which covers most well-located servers. If you play with higher latency or packet loss, expect to loosen thresholds. A laggy connection produces false positives on Speed and Blink checks, and no client-side detector can fully separate lag from cheating.
Compatibility with play-style mods is weak by design. If you run a heavily modded client with movement-altering mods, you will likely see a large number of misreports. On vanilla-plus setups, the results are far cleaner.
A Tool, Not a Verdict
CheatDetector for Minecraft fills a gap that server-side anti-cheats cannot: it gives the player visibility. You can confirm suspicions, check whether your own connection is tripping flags, and tune the whole thing to your network. Just keep the disclaimer in mind. Every detection is a data point, not proof, and the mod is at its best when you use it to understand what is happening on your server rather than to police it.