How do I install Psi?

Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. Download the .jar. Put it in the .minecraft/mods folder and launch that loader profile. Opens on CurseForge — not every file is mirrored on our own servers.

What Minecraft version does Psi work with?

The listing gives Minecraft 1.21.1, 1.20.1, 1.19.2, among others. This is the version stated by the author or source site, not something we verified ourselves.

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Psi

Java mod listed for Minecraft 1.16–1.21. File opened and checked on 19 Oct 2026; downloads from the MC Java Mods app on Android.

by Vazkii · on CurseForge

Which build do you need?

This mod ships a separate file for every mod loader and every version of the game. Pick both, then download — the wrong build installs fine and then does nothing in the game.

Mod loader

Mod loader Fabric1 build
Mod loader NeoForge1 build
Mod loader Forge4 builds

Minecraft version

Minecraft 1.21.1Newest

Minecraft 1.21.1Newest

Minecraft 1.20.1Newest
Minecraft 1.19.2
Minecraft 1.18.2
Minecraft 1.16.3–1.16.5

⬇ Download for 1.21.1 · Fabric ⬇ Download for 1.21.1 · NeoForge ⬇ Download for 1.20.1 · Forge ⬇ Download for 1.19.2 · Forge ⬇ Download for 1.18.2 · Forge ⬇ Download for 1.16.3–1.16.5 · Forge

I don't know my version or loader

Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.

No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.

Open in MC Java Mods Get it on Google Play →

Psi — Minecraft Java mod, screenshot 5

About

Warning: Psi Requires Patchouli for 1.16.5 and more recent versions. Older versions require AutoRegLib

Psi is a magical tech spell programming mod inspired by Mahouka Kokou no Rettousei. Don't worry if that doesn't make any sense.

The core of Psi is a system where you can create action sequences ("Spells") to be executed in the world. This system is followed by a leveling system containing ingame documentation and tutorials of the various concepts and pieces you'll get. The mod makes use of basic mathematical concepts, such as Vectors in its systems, which allows for great flexibility on what spells can do.

Psi spells can be shared and copied to and from outside sources, using ingame sharing tools. The main repository for user made psi spells is the Psi Spell Compendium on reddit.

Psi...

Is very flexible on what it allows you to do;
Encourages creativity and problem solving;
Ties in the reward to the creation process;
Can do some pretty cool stuff.

Learn more about Psi today

Visit the Official Website

Psi — Minecraft Java mod, screenshot 6

Quick facts

Edition: Minecraft Java
File type: .jar
Minecraft versions listed: 1.21.1, 1.20.1, 1.19.2
How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.

Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.

File checked by MCModsHub