Curios API (1.21.11, 1.20.1)

Most Minecraft mods that add rings, amulets, or other wearable items need a way to handle extra equipment slots — and Curios API is the library that makes it all work. Developed by TheIllusiveC4, this lightweight API provides a unified system for creating and managing custom accessory slots, letting mod developers focus on their content instead of reinventing inventory mechanics. With over 21 million downloads on Modrinth, Curios has become one of the most essential library mods in the ecosystem, quietly powering countless accessory-based mods across Forge, Fabric, and NeoForge.

Key Features

• On-demand equipment slots — No slots are loaded by default. New accessory slots are created only when a mod requests them, keeping your game lean when you don't need extras.
• Fully customizable slot system — Each slot can have its own background icon, size, and behavior. Developers can even disable or hide slots dynamically, giving fine-grained control over how equipment appears in the UI.
• Vanilla tag integration — Items are assigned to curio slots using the vanilla tag system, making it straightforward for mod authors and pack makers to define which items go where without complex configuration.
• Complete inventory mechanic support — Enchantments like Mending and Curses work seamlessly on items equipped in curio slots, so players don't lose functionality by using accessory gear.
• Centralized inventory GUI — All available curio slots are accessible from a single screen within the player inventory, keeping everything organized in one place.

Screenshots

How to Install

1. Download and install your preferred mod loader (Forge, NeoForge, or Fabric) for your Minecraft version.
2. Download the correct Curios API file matching your loader and Minecraft version.
3. Place the downloaded .jar file into your .minecraft/mods folder.
4. Launch Minecraft and verify Curios API appears in your mod list — the curio inventory button should show up next to your player inventory.

Requirements

Download

What's New

• Updated to Minecraft 1.21.11 in the latest release (v14.0.0).
• This is a major version bump, indicating potential breaking changes for developers using the API.
• The project continues to follow Semantic Versioning and Keep a Changelog standards.
• Full changelog history is maintained on the GitHub repository.

FAQ

Does Curios API add any items or slots by itself?

No. Curios API is a library mod — it provides the framework for other mods to create accessory slots. By default, it only adds an inventory GUI and two example items available in Creative mode.

Is Curios API required for mods like Artifacts or Trinkets?

Many popular accessory mods on Forge and NeoForge use Curios API as their equipment slot system. If a mod lists Curios as a dependency, you'll need it installed for that mod to function.

Will Curios API affect my game performance?

Curios appears to be lightweight by design — slots are only created when another mod requests them, so there's no unnecessary overhead if you have it installed but no curio-using mods loaded.

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