Better Compatibility Checker Mod Wiki

Better Compatibility Checker Mod Wiki & Guide

wiki.9minecraft.net/better-compatibility-checker-mod/

Better Compatibility Checker Mod is a utility designed to improve the compatibility checking process for Minecraft servers and modpacks. Features: It replaces the default Forge server compatibility checker, ensuring more accurate results when comparing modpack versions between servers and clients.

Guides

Step-by-step, in-game.

Fixing a Red X When Joining a Modded ServerUnderstanding What the Red X Means The red X is not a crash — it is a warning that the modpack project ID or version…How to Configure Better Compatibility Checker as a Modpack AuthorFinding and Editing the Config File Better Compatibility Checker reads the modpack identity from a config file that…Making the Green Checkmark Appear for Your PlayersWhy the Checkmark Sometimes Does Not Show The green checkmark only appears when the client and server agree on both…Using Better Compatibility Checker to Verify a Server Before JoiningReading the Compatibility Screen When you connect to a modded server, Better Compatibility Checker intercepts the…

Frequently asked questions

How do I set up Better Compatibility Checker on my server?

Install the mod on both the server and the clients, then have the modpack author edit the config file (bcc-common.toml for Forge or bcc.json for Fabric) to set the modpack name and version. The mod will then compare these values when clients connect.

What do the green checkmark and red X mean on the compatibility screen?

A green checkmark means the modpack project ID and version ID on your client match the server's. A red X means they don't match, so you're likely running a different version of the modpack than the server.

Why do I see a red X when joining my friend's server?

Your client's modpack version doesn't match the server's configured modpack version. Update your modpack to the same version the server is running, or ask the server owner which version to use.

Do I need to install Better Compatibility Checker on the client too?

Yes, for the check to work properly it should be installed on both the server and the client. If it's only on the client, the mod falls back to the standard Forge compatibility implementation.

See all 20 Better Compatibility Checker questions ›

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