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Poly Mod Loader

Run Forge, Fabric, NeoForge, and Quilt mods together in one game

Never choose between Forge and Fabric again. Poly lets you run Fabric, NeoForge, Forge, and Quilt mods together in a single Minecraft: Java Edition installation.Drop your favorite Forge content mods and Fabric optimization mods into the same mods folder and start playing immediately.Every mod is verified before the game launches: incompatible mods are safely isolated with clear explanations so your game never crashes at startup.

DownloadInstall guide

Poly Mod Loader 1.4.0 · Minecraft 26.1, 26.1.1, 26.1.2, 26.2, 26.3 · Windows, macOS, Linux

Install in three steps

  1. Download the installerGrab the universal installer (.jar) for Windows, macOS, or Linux (requires Java 17 or newer).
  2. Run the installerStart vanilla Minecraft once in the version you want, close the launcher, and click Install.
  3. Pick the profile and playSelect the Poly Mod Loader profile in the Minecraft Launcher, drop your mods into the mods folder, and play.

What runs today

Support in Poly Mod Loader 1.4.0. See Supported versions and loaders and Compatibility for full test results and error codes.

  • Fabric

    Supported

    Fabric mods run the way they do in Fabric Loader, without installing Fabric Loader separately.Checked with popular Fabric mods on 26.1 and 26.2 (138 mods on 26.2, including Sodium, Iris and Lithium) on the client and dedicated server, and on 26.3 servers (headless, 2026-10-27).

  • NeoForge

    Supported

    Poly Mod Loader runs NeoForge itself, downloading its files automatically on the first launch.Checked with popular NeoForge mods on 26.1, 26.1.2 and 26.2 (54 mods on 26.2, including Sodium and Iris) on the client and server, and on 26.3 servers with NeoForge 26.3.0.98 (headless, 2026-10-27).

  • Forge

    Supported

    Poly Mod Loader runs MinecraftForge itself, downloading its files automatically on the first launch.Checked with popular Forge mods on 26.1, 26.1.2 and 26.2 (40 mods on 26.2) on the client and server, and on 26.3 servers with Forge 66.1.0 (headless, 2026-10-27).

  • Quilt

    Supported

    Quilt mods run with the Quilt Loader API, their Mixins and access wideners—no separate Quilt Loader needed.Checked against every Quilt-only build on Modrinth for 26.1, 26.1.2 and 26.2, and on a 26.3 dedicated server (headless, 2026-10-27). Mods that need QSL are left out because QSL has no 26.x release.

  • Mixing loaders

    Partial

    Fabric and Quilt mods can share one game with Forge mods or with NeoForge mods when their game patches fit.Mods whose hooks conflict with Forge or NeoForge patches are left out before launch and counted on the title screen (on 26.2: three Fabric mods next to Forge, 10 Fabric API modules next to NeoForge). Forge and NeoForge cannot share one game yet. Since 1.2.5, mixing loaders works on 26.3 too.

  • Poly Mods

    Supported

    Mods built with Poly Mod Loader’s own version-independent Native API.They run in single player and on dedicated servers across Minecraft 26.1 – 26.3 without rebuilding.

Why Poly: True Engine-Level Mod Loading

Poly is not just another modpack launcher. It is an in-game mod loader operating directly at the JVM bytecode and game engine level.

  • Bytecode Engine

    Runtime Bytecode Transformation

    No external wrappers or dual processes. Poly transforms Mixin, FML, and Access Widener calls on the fly inside the JVM classloader, allowing seamless cross-loader interactions in a single game heap.

  • Isolation Safety

    Pre-Launch Conflict Diagnostics

    Instead of crashing at startup when an incompatible mod is found, Poly isolates that mod before the world loads and gives you an explicit POLY- error code while keeping the rest of your mods running.

  • Performance

    Zero Overhead Native Speed

    Because mods run natively in the host engine without emulation overhead, tick rates and frame times match vanilla and standalone loader performance.

  • Launcher Freedom

    Official Minecraft Launcher Integration

    No new third-party launcher to trust with your account. Poly integrates straight into your official Minecraft Launcher as a clean, standard game profile.

Why Poly

  • Four mod ecosystems, one install

    Fabric, NeoForge, Forge and Quilt mods usually need separate profiles. Poly runs all four, and lets you combine Fabric and Quilt mods with Forge or NeoForge mods when their game patches fit.

  • Clear reasons instead of crashes

    Before the game starts, every mod is checked. If a mod cannot run, only that mod is left out—the title screen and the log tell you which one and why, while the rest of your mods still load.

  • Works in the official launcher

    The installer adds a profile straight to the official Minecraft Launcher—no new launcher to learn. The same installer can also set up a dedicated server.

In the game

  • The Minecraft title screen with the lines "Fabric mods: 1" and "Forge mods: 3" in the lower left corner.
    The title screen shows how many mods from each loader are active (and, if any were left out, how many).
  • A broken stone block falling apart into pieces under a zombie, in a Minecraft world.
    Physics Mod (a Forge mod) breaks a stone block into pieces while Sodium (a Fabric mod) runs in the same game.

Security & Open-Source Transparency

Built with open-source rigor, verified releases, and community trust at its core.

  • MPL-2.0 Open Source

    All source code is publicly accessible under the Mozilla Public License 2.0. Inspect, verify, and contribute freely on GitHub.

  • SHA-256 Checksums

    Every release includes cryptographic SHA-256 hashes so you can independently verify installer file integrity.

  • Documented Architecture

    Detailed specifications for classloader topology, bytecode virtualizer, and multi-loader bridges are fully published.

For mod developers: Poly Mods

Poly Mods use Poly Mod Loader’s Native API instead of Minecraft’s internal classes.The API is in preview and can still change between releases.

Start a Poly Mod

  • One build for 26.*

    Because the API hides internal Minecraft classes, a mod using only the Native API can target a version range like 26.* without rebuilding.

  • Works next to Fabric mods

    Poly Mods and Fabric mods can depend on each other in the same game.

  • Errors that say what to fix

    An invalid declaration stops at startup with a clear POLY-… error code, instead of crashing later in a world.

  • Headless in-game tests

    Run automated game tests with mock players on a headless test server straight from Gradle.

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