Rainbow
by GeyserMC
Rainbow is a client-side Fabric tool that generates Geyser block, item, skull and waypoint mappings from loaded Java resource packs.
What it does
Rainbow reads the assets of resource packs that the client has loaded and gathers information about blocks, items, sounds and waypoint styles. It detects custom blocks through block state overrides and inspects items in the inventory, container and crafting menus when they are opened. From those results it writes mapping files that Bedrock resource packs can use alongside Geyser's custom content APIs. The mapping output is described by the author as experimental, and the list of supported features is more complete than the short summary here.
Fabric API is required, and the mod must be installed on a Minecraft client. Only the client needs it, and the server side is not involved. Rainbow is open source under the GNU Lesser General Public License v3.0 or later. Files are published for Minecraft 26.1 – 26.3, with the latest Fabric build, 0.2.1-26.3-b56 for 26.3, released on 2026-10-15 on the beta channel. Snapshot builds are not mentioned.
Key features
Block and item mappings
Generates Geyser block and item mapping files from the custom content in loaded Java resource packs.
Custom block detection
Finds custom blocks by reading block state overrides in the resource packs the client has loaded.
Inventory scanning
Reads items shown in the inventory, container and menu screens as they are opened.
Model and texture gathering
Collects block and item models, textures and locale overrides for use in Bedrock resource packs.
Client commands
Adds a few commands to the client for running the generator.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Porting Java content to Bedrock
Players and server owners who run custom Java resource pack content through Geyser can produce the matching Bedrock mappings.
Who it’s for: Server owners and resource pack authors who use Geyser with custom content and need Bedrock mappings generated from Java resource packs.
How it compares
Simple Waypoint Mod is a Fabric mod for 26.2 that is client-side only and is not open source, under the MIT License, so it does not generate mappings. Custom Skyblock Waypoint is client-side only, open source under CC0 1.0 Universal, and covers 26.1 – 26.2. GeyserTPC is required on the server and optional on the client, is open source under the MIT License, and covers 26.1 – 26.2.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Rainbow | Fabric | 26.1 – 26.3 | Client-side only | 2026-10-15 |
| Simple Waypoint Mod | Fabric | 26.2 | Client-side only | 2026-08-03 |
| Custom Skyblock Waypoint | Fabric | 26.1 – 26.2 | Client-side only | 2026-07-29 |
| GeyserTPC | Fabric | 26.1 – 26.2 | Server required, client optional | 2026-07-11 |
Questions
Does Rainbow need Fabric API?
Does the server need Rainbow installed?
Which game versions does Rainbow support?
In the catalog
Rainbow is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 8,071 mods support Minecraft 26.3.
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What the author says
Rainbow is a client-side Minecraft mod for the Fabric modloader to generate Geyser block/item mappings, locale overrides, and bedrock resourcepacks for use with Geyser's custom content APIs. Rainbow is available for Minecraft 26.3. Rainbow works by detecting custom blocks (using block state overrides) from loaded…
Official listing
- Modrinth page
- modrinth.com/mod/rainbow-mod
- Owner
- GeyserMC
- Published
- 2026-04-10
- Updated on Modrinth
- 2026-10-15
- Facts verified
- 2026-10-15