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SimplexiumMinecraft mod for 1.21.11

All-in-one Minecraft expansion: powerful automation, smart interactions, mining mechanics, and visual tweaks.

client and servernewest supported release 1.21.11UtilityAdventureDecorationFood
Latest version
1.10-rc1+1.21.11
Minecraft
1.21.1 to 1.21.11
Java
Java 21+
Loader
NeoForge
Licence
LicenseRef-All-Rights-Reserved
Downloads
1.4k
Updated
7 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Simplexium servers

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

  • 1.21.11
  • NeoForge
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

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

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.11NeoForge21+declared9 Dec 2025
1.21.10NeoForge21+declared7 Oct 2025
1.21.4NeoForge21+declared3 Dec 2024
1.21.1NeoForge21+declared8 Aug 2024

Download

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

Browse 60 indexed releases

Most recently published release

1.10-rc1+1.21.11release20 Mar 2026

simplexium-neoforge-1.10-rc1+1.21.11.jar · 0.3 MB · for 1.21.11 · NeoForge

Download this release
807df4c4f7ba…
Older versions24
  • 1.10-rc1+1.21.1020 Mar 20261.21.100.3 MB9 downloads8e5ec4d288a5…Get
  • 1.10-rc1+1.21.420 Mar 20261.21.40.3 MB12 downloads8b3ebe9e4556…Get
  • 1.10-rc1+1.21.120 Mar 20261.21.10.3 MB53 downloads7f101378faa5…Get
  • 1.9.0+1.21.1111 Mar 20261.21.110.3 MB18 downloads2b28fc334f5a…Get
  • 1.9.0+1.21.1011 Mar 20261.21.100.3 MB8 downloadsf2bdfdb6b44f…Get
  • 1.9.0+1.21.411 Mar 20261.21.40.3 MB7 downloadsad6403a176fa…Get
  • 1.9.0+1.21.111 Mar 20261.21.10.3 MB20 downloadsde5cfd5ec566…Get
  • 1.9.0-rc2+1.21.115 Mar 20261.21.110.3 MB16 downloads4529ee09a058…Get
  • 1.9.0-rc2+1.21.105 Mar 20261.21.100.3 MB10 downloads4dd5a0245db5…Get
  • 1.9.0-rc2+1.21.45 Mar 20261.21.40.3 MB5 downloads4387ef798d5d…Get
  • 1.9.0-rc2+1.21.15 Mar 20261.21.10.3 MB19 downloadsbe2b55cbe7a6…Get
  • 1.9.0-rc1+1.21.1126 Feb 20261.21.110.3 MB25 downloadsb94bf499fb66…Get
  • 1.9.0-rc1+1.21.1026 Feb 20261.21.100.3 MB13 downloads52b0a81340cb…Get
  • 1.9.0-rc1+1.21.426 Feb 20261.21.40.3 MB10 downloadscaba246b4d7c…Get
  • 1.9.0-rc1+1.21.126 Feb 20261.21.10.3 MB31 downloads331a689154c5…Get
  • 1.8.3+1.21.1119 Feb 20261.21.110.2 MB25 downloadsb0a72fcdaa3a…Get
  • 1.8.3+1.21.1019 Feb 20261.21.100.2 MB15 downloads9e7d9d0ae631…Get
  • 1.8.3+1.21.419 Feb 20261.21.40.2 MB10 downloads75c3df3e6d4f…Get
  • 1.8.3+1.21.119 Feb 20261.21.10.2 MB24 downloads654c472c823f…Get
  • 1.8.2+1.21.1114 Feb 20261.21.110.2 MB22 downloadsff6418279860…Get
  • 1.8.2+1.21.1014 Feb 20261.21.100.2 MB9 downloads77c9eb019b89…Get
  • 1.8.2+1.21.414 Feb 20261.21.40.2 MB11 downloadsf3745f0b3c40…Get
  • 1.8.2+1.21.114 Feb 20261.21.10.2 MB19 downloads2a4189976002…Get
  • 1.8.1+1.21.1114 Feb 20261.21.110.2 MB8 downloads79ea44f9c04a…Get

Frequently asked

Does Simplexium work on Minecraft 1.21.11?

Yes. 1.21.11 is the newest Minecraft version Simplexium 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 Simplexium support?

Everything the author has declared, from 1.21.1 up to 1.21.11. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Simplexium 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 Simplexium support?

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 Simplexium?

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.

What licence is Simplexium 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 Simplexium?

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 Simplexium 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. 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.

GeckoLibA 3D animation library for entities, blocks, items, armor, and more!Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftJourneyMapReal-time map used for mapping in-game or your browser as you explore.Architectury APIAn intermediary api aimed to ease developing multiplatform mods.Jade 🔍Shows information about what you are looking at. (Hwyla/WAILA fork for Minecraft 1.16+)Collective🎓 Collective is a shared library with common code for all of Serilum's mods.

Details from Modrinth, where the author last updated it on 20 Mar 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? .