UE4SS

Windows

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Freedom report

No signalScore 5.1

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedThinly documented

UE4SS is ranked #23 of 25 in game mod loaders on Freedom251. It runs on Windows.

Compared on game mod loaders

Supported platforms: Windows
Mod loading method: injection
Load-order control: Yes

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The record

Purpose: UE4SS is a Lua scripting system, C++ modding API, SDK generator, blueprint mod loader, live property editor, and set of dumping utilities for Unreal Engine 4/5 games.
UE support: The documentation lists target Unreal Engine versions from 4.7 to 5.8.
Lua mods: Its Lua scripting API supports writing mods based on the Unreal Engine object system.
Blueprint mods: Blueprint modloading can spawn blueprint mods automatically without editing or replacing game files.
Live property editor: The Live Viewer can search, view, edit, and watch properties of loaded objects to help debug mods and inspect runtime changes.
Code generation: UE4SS can generate Unreal Header Tool compatible headers for a mirror project and standard C++ headers from reflected classes and blueprints.
File and map utilities: Its dumpers can generate .usmap mapping files for unversioned properties and dump loaded actors to generate .umaps in-editor.
Installation options: The installation guide describes basic and developer packages, experimental builds, manual injection, and a central install location for multiple games.
Intended users: The basic install is intended for end users using UE4SS-dependent mods, while the developer install is intended for mod developers or users who need debugging, dumping, or other utilities.
Compatibility limitation: UE4SS is not described as a plug-and-play solution that works with every game; users may need to update AOBs themselves.
Platform: The build documentation lists Win64 as its supported platform and says Linux support might happen later, but not soon.
Security reporting: The project asks users to report sensitive security issues by emailing [email protected] rather than posting them to the issue tracker.
Support channels: The documentation directs users to search existing issues and documentation first, then open an issue with context, platform versions, and logs when available.

Where it ranks on Freedom251

Best Game Mod Loaders in 2026#23 of 25

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Sources

docs.ue4ss.com/index.html· checked 4 Oct 2026
docs.ue4ss.com/feature-overview/live-view.html· checked 4 Oct 2026
docs.ue4ss.com/installation-guide· checked 4 Oct 2026
docs.ue4ss.com/dev/contributing.html· checked 4 Oct 2026