Handy Indicator

The mod places a subtle colored crown on the top face of containers that hold items, covering hoppers and droppers as well as the dispensers, crafters and barrels found in storage builds. Chests, trapped chests and copper chests receive the same marking. Furnaces, blast furnaces, smokers and decorated pots are covered too. A loaded hopper shows one color and an empty barrel shows another, which helps when checking a row of hoppers or a dropper contraption without right-clicking each block.

Double chests are read as one container, so a single indicator spans both halves instead of two disconnected crowns. Furnaces get a separate indicator for each input and fuel slot in distinct colors, which makes a stalled or fuel-starved furnace visible at a glance. Each block type can be toggled on or off, and the indicator colors can be chosen in the config screen. The overlay works alongside resource packs and similar tools such as Redstone Levels hopper direction indicators.

The mod is a Fabric mod for Minecraft 1.21.11 – 26.3 and requires Fabric API. The source code is open under the MIT License, and snapshot builds are published along with the release files.