RedCheck

When a player looks at a supported block, RedCheck shows its redstone state on the HUD: redstone power, repeater delay, the total delay of a repeater chain, comparator mode, and the fill level of a container. The aim is to give immediate visual feedback while building or testing a contraption, without opening the F3 debug screen or checking each block by hand.

RedCheck works entirely on the client and uses only data the Minecraft client already has. Since the mod never leaves the client, container details can only appear in the HUD once a player has actually viewed that container during the session. RedCheck therefore caches container contents locally the first time a container is opened, so the HUD can keep showing them later, and it can approximate comparator output and fill level in parts of the world not currently loaded for the player.

RedCheck requires YetAnotherConfigLib (YACL), and Mod Menu is optional for opening its settings. The mod runs on Fabric for 1.21.10 – 1.21.11, with the latest file 0.1.69 for 1.21.11. It is released under the MIT License and is not open source. Only the client needs it, so servers run without it.