Unlerp
Unlerp changes how the client smooths entity movement between game ticks, so motion looks steadier on screen.
What it does
The mod adjusts the client's tickDelta and its interpolation curve, which controls how positions and movements are drawn between server updates. Players can set how many ticks are interpolated over entity movement in the configuration, and the default setting has been changed to suit the situations the author describes. Unlerp 2 and later versions add further options, and the configuration menu can be opened from within the game.
Unlerp is client-side only, so servers do not need it and players joining without it are unaffected. It requires MidnightLib, which must also be installed on the client. Builds exist for Fabric across 92 release versions, 1.0 – 1.21.5, and the code is released under the GNU Lesser General Public License v3.0 only, which makes the mod open source. Its public source code is available.
Key features
Interpolation tuning
The number of ticks interpolated over entity movement can be set in the configuration, changing how smoothly updates appear.
Custom interpolation curve
The client's tickDelta can follow a custom interpolation curve, aimed at making movement look smoother than vanilla.
Configuration menu
A GUI opens from inside the game where the interpolation settings can be changed without editing files.
Version 3 update
Version 3 adds one change the author describes as useful, alongside the version 2 options.
Compatibility
Latest build for each game version and loader.
1.21.x6 of 6 versions with builds
1.20.x7 of 7 versions with builds
1.19.x5 of 5 versions with builds
1.18.x3 of 3 versions with builds
1.17.x2 of 2 versions with builds
1.16.x6 of 6 versions with builds
1.15.x3 of 3 versions with builds
1.14.x5 of 5 versions with builds
1.13.x3 of 3 versions with builds
1.12.x3 of 3 versions with builds
1.11.x3 of 3 versions with builds
1.10.x2 of 2 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
44 older game versions (1.0 – 1.10) not shown. All files on Modrinth
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Servers with frequent updates
On servers that send more position updates, the interpolation settings can be adjusted to make movement look more even.
Who it’s for: Players who want smoother movement display on the client, and players who are willing to tune interpolation settings themselves.
Questions
Does Unlerp need to be installed on the server?
What does Unlerp require?
Can Unlerp trigger anticheat systems on servers?
In the catalog
Unlerp is one of 7,555 Cursed mods on ModsFinder, and one of 4,235 Cursed mods for Fabric. 15,307 mods support Minecraft 1.21.5.
More from Goobercorp Modding Industries
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What the author says
Version 3 adds something that may actually be useful for once! You can now configure the amount of ticks over which entity movements are interpolated. This means that for people playing on servers that send more updates than vanilla (you know who you are), gameplay will be much smoother. The mod's default…
Official listing
- Modrinth page
- modrinth.com/mod/unlerp
- Owner
- Goobercorp Modding Industries
- Published
- 2024-09-02
- Updated on Modrinth
- 2025-09-15
- Facts verified
- 2026-10-15