Osmium
by Lobstershack
Osmium is a client-side Fabric utility that collects quality-of-life options similar to those in PvP clients.
What it does
Players can switch on an FPS counter, lower fire on screen, draw a custom cape, outline the block under the cursor, and boost flight speed. Two options turn off the particle effects from nether portals and firework rockets, which can reduce visual clutter in busy scenes. Because only the client needs the mod, servers running vanilla or other mods do not have to change anything.
Osmium requires Fabric API. Its files are published for Fabric alone, and the latest one, 1.4.2-1.21 for 1.21, dates from 2024-06-17. The first release came out on 2021-08-05, and builds reach from 1.17 up to 1.21 across 14 release versions, including 1.20.6 and 1.19.3. The code is open source under the CC0 1.0 Universal license, so it can be reused without conditions.
Key features
FPS display
A frame rate counter shows the current performance figure on screen.
Fire and particle controls
Fire can be lowered in the view, and nether and firework particles can be disabled individually.
Custom cape rendering
The player's cape can be drawn with custom textures on the character model.
Block outline and fly boost
An outline marks the targeted block, and the flight speed can be increased above the default.
Compatibility
Latest build for each game version and loader.
1.21.x1 of 1 version with builds
1.20.x5 of 5 versions with builds
1.19.x3 of 3 versions with builds
1.18.x3 of 3 versions with builds
1.17.x2 of 2 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Playing on a private world
Players who only want a few visual and movement tweaks can enable them in single-player without touching any server.
Recording clean footage
Turning off firework and nether particles keeps effects out of the frame when capturing a scene.
Who it’s for: Players who want frame rate and movement options on the client, and who play Fabric builds with Fabric API installed.
How it compares
Thymine is a Fabric mod for 1.16 – 1.21.11 that is client-side only and released under the MIT License, so it covers a similar range of versions and is open source. Fullbright is a client-side Fabric mod for 1.19 – 26.1.2 released under the GNU General Public License v3.0 only, and it is open source. Osmium is open source under CC0 1.0 Universal.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Osmium | Fabric | 1.17 – 1.21 | Client-side only | 2024-06-17 |
| Thymine | Fabric | 1.16 – 1.21.11 | Client-side only | 2026-05-10 |
| Fullbright | Fabric | 1.19 – 26.1.2 | Client-side only | 2026-04-02 |
Questions
Does Osmium need Fabric API?
Does Osmium have to be installed on a server?
Which game versions does Osmium support?
In the catalog
Osmium is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 15,770 mods support Minecraft 1.21.
Similar mods
What the author says
Features include - ToggleSprint - ToggleSneak - Fullbright - No rain - Fps display - Low fire - NoHurtBob - Custom cape rendering - Block outline - Fly boost - Disable nether particles - Disable firework particles
Official listing
- Modrinth page
- modrinth.com/mod/osmium
- Owner
- Lobstershack
- Published
- 2021-08-05
- Updated on Modrinth
- 2024-06-17
- Facts verified
- 2026-10-15