ModsFinder

OtterLib

by Oth3r

OtterLib is a small library for Fabric and Quilt that its author wrote mainly to simplify development of other mods.

FabricQuiltClient and serverMIT LicenseOpen source1.20 – 26.3

What it does

Other mods can build on OtterLib instead of writing their own shared code. The author also lists Spigot and Paper as supported platforms in the description, while the catalog files target Fabric and Quilt, so server owners should check the file they choose. Fabric API is required and must be installed alongside it. Three other catalog mods require OtterLib: Sit!, More Heart Types and DirectionHUD.

Key features

  1. Shared library code

    Provides common code that other mods can call, so each mod does not need to bundle its own copy.

  2. Covered game versions

    Builds exist for 24 release versions, 1.20 – 26.3, with 0.4.0.2+26.3 as the latest file.

  3. Public source code

    The source code and issue tracker are public, so anyone can read the code or report a problem.

Compatibility

Latest build for each game version and loader.

No stable releases
Every published file is a beta or alpha build.
26.x5 of 5 versions with builds
26.30.4.0.2+26.30.4.0.2+26.3
26.20.4.0.0+26.20.4.0.0+26.2
26.1.20.3.0.1+26.10.3.0.1+26.1
26.1.10.3.0.1+26.10.3.0.1+26.1
26.10.3.0.1+26.10.3.0.1+26.1
1.21.x10 of 10 versions with builds
1.21.110.2.2.1+1.21.110.2.2.1+1.21.11
1.21.100.2.2.1+1.21.100.2.2.1+1.21.10
1.21.90.2.2.1+1.21.100.2.2.1+1.21.10
1.21.80.2.2.1+1.21.80.2.2.1+1.21.8
1.21.70.2.2.1+1.21.80.2.2.1+1.21.8
1.21.60.2.2.1+1.21.80.2.2.1+1.21.8
1.21.50.2.2.0+1.21.50.2.2.0+1.21.5
1.21.40.2.2.0+1.21.40.2.2.0+1.21.4
1.21.10.2.2.0+1.21.10.2.2.0+1.21.1
1.210.2.2.0+1.21.10.2.2.0+1.21.1
1.20.x3 of 3 versions with builds
ReleaseBetaAlphaNot available

This mod also publishes snapshot builds. Snapshots are not shown in the matrix.

Requirements

Dependencies declared by the latest file for each loader.

Required 1

Fabric APILightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.
Required

Required by 3 mods

Sit!1.20 – 26.3More Heart Types1.18.2 – 26.3DirectionHUD1.19 – 26.3

Questions

Does OtterLib need Fabric API?

Yes. Fabric API is a required dependency and has to be installed next to OtterLib.

Does OtterLib have to run on both client and server?

Yes. The server and every player need the mod installed.

In the catalog

OtterLib is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 8,071 mods support Minecraft 26.3.

Library mods3,514Fabric modsMods for 26.38,071

More from Oth3r

All projects
Sit!1.20 – 26.3More Heart Types1.18.2 – 26.3DirectionHUD1.19 – 26.3Caligo1.19.4 – 1.21.5Minecart Splitting1.20.1 – 26.2HoneycombCutting1.20.1 – 1.21.11

Similar mods

Fabric API1.14 – 26.3Cloth Config API1.14 – 26.3YetAnotherConfigLib (YACL)1.19 – 26.3Architectury API1.16.5 – 26.3Just Enough Items (JEI)1.8 – 26.3Geckolib1.12.2 – 26.3

What the author says

A simple library mod for minecraft, made mostly to develop my mods easier, but can be used by anyone! Currently supported loaders: Fabric, Spigot, & Paper Implementing on each loader, where ${project.otterlib_version} is the current version of OtterLib for the loader (e.g. 0.2.0.0+1.21.6, 0.2.0.0+1.20-1.21.6)
Oth3r, on the Modrinth page

Official listing

Owner
Oth3r
Published
2025-04-23
Updated on Modrinth
2026-09-30
Facts verified
2026-10-15

Tags

LibraryManagementUtility
Open on ModrinthCompare