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Psi: Tweaks and AdditionsMinecraft mod for 1.21.1

This is a Psi add-on. It adds integration with Mekanism.

client and servernewest supported 1.21.1TechnologyMagic
Latest version
1.21.1-0.10.4
Minecraft
1.20.1 to 1.21.1
Java
Java 21+
Loaders
Forge, NeoForge
Licence
MIT
Downloads
1.2k
Updated
7 d ago
Available on
Modrinth
Space NodePartner

Host Psi: Tweaks and Additions servers

One click and Psi: Tweaks and Additions 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 Psi: Tweaks and Additions 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 Psi: Tweaks and Additions’s own host. Nothing is re-hosted here.

1.21.1-0.10.4beta31 Jul 2026

psitweaks-1.21.1-0.10.4.jar · 1.9 MB · for 1.21.1

Download latest
5eeabd328615…
Older versions21
  • 1.20.1-0.10.431 Jul 20261.20.12.2 MB5 downloads0de5c2833fea…Get
  • 1.20.1-0.10.326 Jul 20261.20.12.2 MB22 downloadsa0e7dceb0c7d…Get
  • 1.21.1-0.10.326 Jul 20261.21.11.8 MB31 downloadse62135dec19d…Get
  • 1.21.1-0.10.219 Jul 20261.21.11.7 MB45 downloadsb316ef421b84…Get
  • 1.20.1-0.10.219 Jul 20261.20.12.1 MB23 downloads9814a0334010…Get
  • 1.20.1-0.10.118 Jul 20261.20.12.1 MB9 downloadsbcd9c14c14dd…Get
  • 1.21.1-0.10.118 Jul 20261.21.11.7 MB9 downloadsecc5acafc361…Get
  • 1.20.1-0.10.010 Jul 20261.20.12.0 MB37 downloads14b4399b97db…Get
  • 1.21.1-0.10.07 Jul 20261.21.11.6 MB47 downloads634e3e252c8b…Get
  • 0.9.516 May 20261.20.11.4 MB127 downloadsac265d49fb20…Get
  • 1.21.1-0.9.516 May 20261.21.11.0 MB302 downloadsb922ad0ee10f…Get
  • 1.21.1-pre6 May 20261.21.10.9 MB54 downloads299b29b78eae…Get
  • 0.9.42 May 20261.20.11.4 MB39 downloads859fe2ee61e0…Get
  • 0.9.320 Mar 20261.20.11.2 MB121 downloadscb5001a74635…Get
  • 0.9.25 Mar 20261.20.11.1 MB91 downloads4773ecec058e…Get
  • 0.9.025 Feb 20261.20.11.1 MB75 downloadsb0091efca931…Get
  • 0.8.321 Feb 20261.20.10.9 MB52 downloadsb9b691d98070…Get
  • 0.8.219 Feb 20261.20.10.8 MB32 downloads1871f6c0f518…Get
  • 0.8.117 Feb 20261.20.10.8 MB30 downloadsdcc58dcc3f5c…Get
  • 0.8.013 Feb 20261.20.10.6 MB40 downloads9cb2f7022c87…Get
  • 0.7.29 Feb 20261.20.10.4 MB33 downloadsc1fe7ddc15ef…Get

Frequently asked

Does Psi: Tweaks and Additions work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Psi: Tweaks and Additions 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 Psi: Tweaks and Additions 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 Psi: Tweaks and Additions 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 loader does Psi: Tweaks and Additions need?

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

Which Java version do I need for Psi: Tweaks and Additions?

Java 21 or newer, because that is what the newest Minecraft release it supports requires. The requirement comes from the game rather than from the mod itself.

What licence is Psi: Tweaks and Additions under?

MIT, 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 Psi: Tweaks and Additions?

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 Psi: Tweaks and Additions safely?

From the author's own page on Modrinth, which is where the data here is synced from. MCReference never mirrors, re-hosts or repackages a file: every download button points at the original source, so you get exactly what the author published.

Works on the same versions

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

Entity CullingUsing async path-tracing to hide Block-/Entities that are not visibleFerriteCoreMemory usage optimizationsImmediatelyFastSpeed up immediate mode rendering in MinecraftYetAnotherConfigLib (YACL)A builder-based configuration library for Minecraft!Xaero's MinimapDisplays a map of the nearby world terrain, players, mobs, entities in the corner of your screen. Lets you create waypoints which help you find the locations you've marked.[ETF] Entity Texture FeaturesEmissive, Random & Custom texture support for entities in resourcepacks just like Optifine but for Fabric

Last checked 6 d ago against Modrinth. 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? .