Local Difficulty Utilities
Local Difficulty Utilities lets players and server owners view and edit the inhabited time stored in chunks, so the local difficulty shown in-game matches the server's actual value.
What it does
The mod fixes a case where the local difficulty display on a client does not reflect the server's chunk data. The inhabited time value of each chunk is synced from the server to the client, so the client sees the real difficulty. Without the mod, a client connected to a server that runs it cannot read that information and shows an incorrect local difficulty.
Commands let a player inspect and change chunk timers, and a region command limits those edits to chunks currently held in memory. Configurable options control debugging, syncing and direct modification of local difficulty values. The mod is a lightweight utility and needs Fabric API and Cloth Config to run.
Local Difficulty Utilities is open source under the MIT License, with public source code and an issue tracker. Files target the 1.21 – 1.21.5 range, and the latest Fabric build is 1.0.1+1.21.2 for 1.21.5.
Key features
Synced inhabited time
The server sends each chunk's inhabited time to the client, so the displayed local difficulty is accurate.
Chunk view and edit commands
Commands show and change the inhabited time of chunks, useful for testing difficulty scaling.
Region selection
A region command limits editing to chunks that are loaded in memory, so unloaded areas are not touched.
Configurable options
Settings control debugging output, syncing behavior and direct modification of local difficulty values.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Server owners and players who want the displayed local difficulty to match the server, and anyone testing difficulty scaling on a Fabric world.
How it compares
RealTimeSync is client-side only, published for Fabric 1.21.4 under All rights reserved and not open source. Stardom's Sync is client and server, works 1.21 – 1.21.11, and is also not open source. Fabricated Difficulty is server-side only and open source under the GNU Affero General Public License v3.0 only, covering 1.20.1 – 1.21.1. Local Difficulty Utilities is open source under the MIT License and runs on either side.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Local Difficulty Utilities | Fabric | 1.21 – 1.21.5 | Client or server, optional | 2025-05-25 |
| RealTimeSync | Fabric | 1.21.4 | Client-side only | 2025-08-01 |
| Stardom's Sync | Fabric | 1.21 – 1.21.11 | Client and server | 2026-03-01 |
| Fabricated Difficulty | Fabric | 1.20.1 – 1.21.1 | Server-side only | 2026-02-09 |
Questions
Does Local Difficulty Utilities need Fabric API?
Does the server need the mod for players to see correct difficulty?
Which game versions are supported?
In the catalog
Local Difficulty Utilities is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 15,307 mods support Minecraft 1.21.5.
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What the author says
Local Difficulty Utilities is a lightweight utility mod that: - Fixes the client-side display of local difficulty. - Syncs each chunk's inhabited time value from the server, so the client sees the real difficulty. - Adds commands to view and edit the inhabited time of chunks. - Provides configurable options for…
Official listing
- Modrinth page
- modrinth.com/mod/local-difficulty-utilities
- Owner
- HalfFishHalfMan
- Published
- 2025-05-23
- Updated on Modrinth
- 2025-05-25
- Facts verified
- 2026-10-15