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KapLibMinecraft mod for 1.21.1

Library for all purposes

client and servernewest supported 1.21.1UtilityGame MechanicsLibraryManagement
Latest version
v1.32.1-mc1.21.1
Minecraft
1.20.1 to 1.21.1
Java
Java 21+
Loaders
Forge, NeoForge
Licence
LicenseRef-All-Rights-Reserved
Downloads
12.0k
Updated
8 d ago
Available on
Modrinth
Space NodeOur hosting

Host KapLib servers

One click and KapLib is installed with the right loader, on hardware built for it.

  • 1.21.1
  • Forge
  • NeoForge
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Screenshots

Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.

Minecraft versions

Every version KapLib declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1Forge, NeoForge21+declared8 Aug 2024
1.20.1Forge, NeoForge17+declared12 Jun 2023

Download

From KapLib’s own host. Nothing is re-hosted here.

All 60 releases
v1.32.1-mc1.21.1release30 Jul 2026

kap_lib-v1.32.1-mc1.21.1.jar · 261 B · for 1.21.1

Download latest
9e1ab30ddee8…
Older versions24
  • v1.32.0-mc1.21.128 Jul 20261.21.1261 B8 downloads483fe7e68036…Get
  • v1.31.0-mc1.21.115 Feb 20261.21.11.3 MB468 downloads36b6127fe085…Get
  • v1.30.3-mc1.21.123 Oct 20251.21.11.2 MB156 downloads86d5b688f16d…Get
  • v1.30.2-mc1.21.121 Oct 20251.21.11.2 MB104 downloadsaeeb9bb68b08…Get
  • v1.30.1-mc1.21.120 Oct 20251.21.11.2 MB79 downloads7ec74021cb32…Get
  • v1.30.0-mc1.21.120 Oct 20251.21.11.2 MB107 downloadsf292a09fb246…Get
  • v1.29.14-mc1.21.118 Oct 20251.21.11.2 MB102 downloads89f3deffd205…Get
  • v1.29.12-mc1.21.117 Oct 20251.21.11.2 MB109 downloads0a94a884b8dd…Get
  • v1.29.11-mc1.21.117 Oct 20251.21.11.2 MB68 downloads19c722bc5dfe…Get
  • v1.29.10-mc1.21.117 Oct 20251.21.11.2 MB80 downloads1c7d432e198f…Get
  • v1.29.9-mc1.21.117 Oct 20251.21.11.2 MB87 downloadse60b23dad0e7…Get
  • v1.29.8-mc1.21.117 Oct 20251.21.11.2 MB73 downloads0300c31f0278…Get
  • v1.29.7-mc1.21.117 Oct 20251.21.11.2 MB58 downloads2f242226c952…Get
  • v1.29.6-mc1.21.117 Oct 20251.21.11.2 MB75 downloadsc6e886219498…Get
  • v1.29.5-mc1.21.117 Oct 20251.21.11.2 MB81 downloadseac3a04a50a5…Get
  • v1.29.4-mc1.21.117 Oct 20251.21.11.2 MB98 downloads8fcab7729a7b…Get
  • v1.29.3-mc1.21.117 Oct 20251.21.11.2 MB87 downloadsaa00015c02c8…Get
  • v1.29.2-mc1.21.116 Oct 20251.21.11.2 MB113 downloadsd0a70a515b5b…Get
  • v1.29.1-mc1.21.114 Oct 20251.21.11.2 MB75 downloads6c4b7dc55d50…Get
  • v1.29.0-mc1.21.18 Oct 20251.21.11.2 MB169 downloadsd45204d7986c…Get
  • v1.28.4-mc1.20.18 Oct 20251.20.11.3 MB1.2k downloadsf2c655985faa…Get
  • v1.28.3-mc1.20.17 Oct 20251.20.11.3 MB66 downloads9a83c06e3465…Get
  • v1.28.2-mc1.20.17 Oct 20251.20.11.3 MB19 downloadsacf568899ea3…Get
  • v1.28.1-mc1.20.16 Oct 20251.20.11.3 MB20 downloads8dd6b8fb0c84…Get

Frequently asked

Does KapLib work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version KapLib declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does KapLib support?

Everything the author has declared, from 1.20.1 up to 1.21.1. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install KapLib on the client or the server?

Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.

Which platform or loader does KapLib support?

Forge, NeoForge. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for KapLib?

On the newest Minecraft version it supports, Java 21 or newer. The requirement comes from the Minecraft version you run rather than from the mod itself, so on an older supported Minecraft the answer is that version's Java, not this one.

What licence is KapLib under?

LicenseRef-All-Rights-Reserved, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install KapLib?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download KapLib safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. The download link goes to the source recorded for that release; verify the publisher, filename and checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

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Details from Modrinth, where the author last updated it on 21 Sept 2026. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Is this information wrong or missing something? .