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mod

OpenComputers IIMinecraft mod for 1.21.1

Computers and robots for automating things via in-game scripting.

newest supported release 1.21.1TechnologyTechnology Automation
Latest version
oc2-MC1.21.1-0.11.0
Minecraft
1.18.1 to 1.21.1
Java
Java 21+
Loaders
NeoForge, Fabric, Forge
Licence
not stated
Downloads
57.8k
Updated
5 d ago
Available on
CurseForge

Screenshots

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

Minecraft versions

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

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1NeoForge, Fabric, Forge21+declared8 Aug 2024
1.18.2NeoForge, Fabric, Forge17+declared28 Feb 2022
1.18.1NeoForge, Fabric, Forge17+declared10 Dec 2021

Download

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

Browse 31 indexed releases

For Minecraft 1.21.1

Choose the loader you use before downloading.

  • NeoForge

    oc2-MC1.21.1-0.11.0 · 4 Nov 2026 · oc2-MC1.21.1-neoforge-0.11.0-40a717f.jar

    Get NeoForge

  • Fabric

    oc2-MC1.21.1-0.10.1 · 21 Oct 2026 · oc2-MC1.21.1-fabric-0.10.1+6e94a86.jar

    Get Fabric

Most recently published release

oc2-MC1.21.1-0.11.0release4 Nov 2026

oc2-MC1.21.1-neoforge-0.11.0-40a717f.jar · 7.6 MB · for 1.21.1 · NeoForge

Download this release
fd22312e308d…
Older versions24
  • oc2-MC1.21.1-0.10.121 Oct 20261.21.17.3 MBea8353d319e7…Get
  • oc2-MC1.21.1-0.10.020 Oct 20261.21.17.3 MB5a2ce5337415…Get
  • oc2-MC1.21.1-0.9.17 Oct 20261.21.17.3 MB367e5860c1ee…Get
  • oc2-MC1.21.1-0.9.05 Oct 20261.21.17.3 MB75322677e419…Get
  • oc2-MC1.21.1-0.8.01 Oct 20261.21.17.3 MB0279e19ba4bd…Get
  • oc2-MC1.21.1-0.7.225 Sept 20261.21.17.2 MB743cb39aa090…Get
  • oc2-MC1.21.1-0.7.124 Sept 20261.21.17.2 MBf16bbcc70017…Get
  • oc2-MC1.21.1-0.7.021 Sept 20261.21.17.2 MBbd162a96b9d0…Get
  • oc2-MC1.21.1-0.6.020 Sept 20261.21.17.1 MB400ff319c706…Get
  • oc2-MC1.21.1-0.5.015 Sept 20261.21.17.0 MB7b8e537f5071…Get
  • oc2-MC1.21.1-0.4.19 Sept 20261.21.16.9 MB986f9bbf91f3…Get
  • oc2-MC1.21.1-0.4.07 Sept 20261.21.16.9 MB2b0faa2a9cc0…Get
  • oc2-MC1.21.1-0.3.04 Sept 20261.21.16.7 MB9dbe0e0109ef…Get
  • oc2-1.18.2-forge-0.1.8+3feb69b.jar24 Jul 20221.18.22.6 MB150a36f866ee…Get
  • oc2-1.18.2-forge-0.1.7+6a003fc.jar7 Apr 20221.18.22.6 MBbfbbb00cfe45…Get
  • oc2-1.18.1-forge-0.1.6+5d0bd81.jar13 Feb 20221.18.12.6 MB1e93f09622f9…Get
  • oc2-1.18.1-forge-0.1.5+3e6d62e.jar7 Feb 20221.18.12.6 MB920f8faff26c…Get
  • oc2-1.18.1-forge-0.1.4+e1b6fc2.jar7 Feb 20221.18.12.6 MBe16ffc5f91ee…Get
  • oc2-1.18.1-forge-0.1.3+d6a9360.jar30 Jan 20221.18.12.2 MB575a8066c0c8…Get
  • oc2-1.18.1-forge-0.1.2+ab69c69.jar30 Jan 20221.18.12.2 MBf498c3b179c7…Get
  • oc2-1.18.1-forge-0.1.1+f8899d3.jar28 Jan 20221.18.12.2 MBe4a236e14a67…Get
  • oc2-1.18.1-forge-0.1.0+4793aee.jar28 Jan 20221.18.12.2 MB31e93e9dee9b…Get
  • oc2-1.18.1-forge-0.0.8+929f13d.jar25 Jan 20221.18.12.2 MB34e3dd1327f8…Get
  • oc2-1.18.1-forge-0.0.7+c96e52a.jar23 Jan 20221.18.12.2 MBc07a4bd324fb…Get

Frequently asked

Does OpenComputers II work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version OpenComputers II 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 OpenComputers II support?

Everything the author has declared, from 1.18.1 up to 1.21.1. The full list is in the table above, with the Java runtime each version needs next to it.

Which platform or loader does OpenComputers II support?

NeoForge, Fabric, Forge. 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 OpenComputers II?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

How do I install OpenComputers II?

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 OpenComputers II safely?

Start with the author's page on CurseForge, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available 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 CurseForge, where the author last updated it on 4 Nov 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .