ModKit SDK

ModKit SDK is a complete modding framework for Unreal Engine games, distributed as two separate Fab listings designed to work together.

Demo

Want to see ModKit in action? Download the demo — showcases several mod types running in a packaged game. Requires SDK Modkit.

Two Products, One Ecosystem

Product	Audience	Price	Purpose
SDK Modkit	Game developers	Paid	Integrate mod loading into your game
ModKit — Mod Creator	Mod authors	Free	Create and package mods for ModKit-powered games

Both plugins share the same mod format — a .pak file with an embedded ModDescriptor.json — ensuring perfect compatibility between the two sides.

How It Works

Game Developer                    Mod Creator
─────────────────                 ─────────────────
1. Installs ModKit SDK            1. Installs ModKit Authoring (free)
2. Calls StartLoadMods()          2. Creates mod with wizard
3. Binds delegates                3. Authors content in UE
4. Ships game with /Mods folder   4. Validates & packages to .pak
                                  5. Distributes .pak to players
                                        │
Player                                  ▼
──────────────────────────────────────────────────
Drops .pak into /Mods → game auto-loads on start

Supported Unreal Engine Versions

Version	PAK Mods	IoStore Mods
UE 5.1 – 5.3	✅	❌
UE 5.4 – 5.7+	✅	✅

IoStore (UE 5.4+)

IoStore (.utoc / .ucas) support is available in the UE 5.4+ version of the SDK. See IoStore support for details.

Key Features

For Game Developers

• One-line integration — call StartLoadMods() from your loading screen
• Dependency management — topological sort with circular dependency detection
• Class overrides — mods transparently replace your Blueprint classes
• DataTable merging — mods add/replace rows without conflicts
• Native-code rejection — drag-and-drop mods can never ship executable .dll code
• Blueprint SDK generator — export your public API as C++ headers for modders
• Hot-reload — iterate on mods without restarting the Editor
• Full Blueprint API — everything accessible from Blueprints via UModLoaderSubsystem

For Mod Creators

• Wizard UI — scaffold a ready-to-use mod plugin in seconds
• One-click packaging — validate, cook, and PAK in a single action
• Live build log — real-time output during cook and packaging
• CLI support — automate builds in CI/CD pipelines
• Contribution system — declare class overrides and DataTable merges

Navigation

🎮 Game Developer

You're shipping a game and want to add mod support.

→ Installation
→ Quick Start
→ Configuration

🔧 Mod Creator

You're creating a mod for a ModKit-powered game.

→ Installation
→ Creating Your First Mod
→ Building & Packaging