What's That Slot?

This mod is a convenient tool that helps determine which items can be placed in a specific interface slot. To activate the function, simply hold down the Left Alt key - the system will automatically highlight all suitable items in your inventory.

This is especially useful in modded Minecraft packs where many interfaces contain non-obvious slots with unclear purposes. The mod supports both NeoForge and Fabric (as well as older Forge versions) - be sure to select the correct file version during installation!

An additional feature allows you to quickly move suitable items directly from the hint window - simply click on the desired item, and it will automatically move to the target slot:

Important advantage: the mod works exclusively on the client side, so it does not need to be installed on the server for proper operation!