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CynosureMinecraft mod for 1.21.1

A Giant Multiplatform Kotlin-only* Library mod with events, utilities and abstractions

client and servernewest supported release 1.21.1Game MechanicsLibraryManagementCursed
Latest version
1.0.3-fabric
Minecraft
1.20.1 to 1.21.1
Java
Java 21+
Loaders
Quilt, Fabric, Forge, NeoForge
Licence
LGPL-3.0-or-later
Downloads
573.4k
Updated
1 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Cynosure servers

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

  • 1.21.1
  • Quilt
  • Fabric
  • 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 Cynosure declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1Quilt, Fabric, Forge, NeoForge21+declared8 Aug 2024
1.20.1Fabric, Forge, NeoForge, Quilt17+declared12 Jun 2023

Download

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

Browse 40 indexed releases

For Minecraft 1.21.1

Choose the loader you use before downloading.

  • Fabric, Quilt

    1.0.3-fabric · 21 Sept 2026

    Multiple loaders are listed; verify the file before downloading.

    Choose file on publisher ↗

  • NeoForge

    1.0.3-neoforge · 21 Sept 2026 · cynosure-1.0.3-neoforge-1.21.1.jar

    Get NeoForge

Most recently published release

1.0.3-fabricbeta21 Sept 2026

cynosure-1.0.3-fabric-1.21.1.jar · 2.6 MB · for 1.21.1 · Fabric, Quilt

Choose file on publisher ↗
11d57875851d…
Older versions24

Dependencies

What Cynosuredeclares it needs, from the author’s own release metadata. A required one has to be installed alongside it or it will not load.

Fabric APIRequired. Lightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.Fabric Language KotlinRequired. This is a mod that enables usage of the Kotlin programming language for Fabric mods.Kotlin for ForgeRequired. Adds a Kotlin language loader and provides some optional utilities.

Frequently asked

Does Cynosure work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Cynosure 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 Cynosure 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 Cynosure 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 Cynosure support?

Quilt, Fabric, 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 Cynosure?

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 does Cynosure need to run?

It declares Fabric API, Fabric Language Kotlin and Kotlin for Forge as required, so those have to be installed alongside it or it will not load. Each one is linked in the dependencies section above.

What licence is Cynosure under?

LGPL-3.0-or-later, 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 Cynosure?

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 Cynosure 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!BookshelfAn open source library for other mods!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.Enchantment DescriptionsAdds in-game descriptions for enchantments to tooltips.

Used by

1 project lists Cynosure as a required dependency.

EstrogenA Mod Based around expressing yourself, fluid handling and discovery. This mod add a lot of new Items, Blocks, Mechanics and more!

Details from Modrinth, where the author last updated it on 21 Sept 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? .