# UE4SS-RE/RE-UE4SS

Injectable LUA scripting system, SDK generator, live property editor and other dumping utilities for UE4/5 games

Repository: https://github.com/UE4SS-RE/RE-UE4SS
Canonical: https://ross.abutalabs.com/products/re-ue4ss
Homepage: http://docs.ue4ss.com/
Language: C++
License: MIT
License Family: permissive
Topics: lua, scripting, sdk-generation, ue4, ue5, mod-loader
Last push: 2026-08-26T17:14:04+00:00

## Health v2 (maintenance only)
Score: 67/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 8, longevity 99
- inputs: {"age_days": 1399, "days_push": 7, "days_rel": 612, "gap_med": null, "n_releases_24m": 1}
- flags: prerelease_only
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2832, forks 490 (observed 2026-08-28T04:07:24.369742+00:00)

## What it is
UE4SS is an injectable Lua scripting system and C++ modding API for Unreal Engine 4/5 games, along with an SDK generator, blueprint mod loader, and live property viewer/editor. It also provides dumping utilities for generating C++ headers, .usmap mapping files, and .umap files from running games.

## Use cases
- write lua mods for unreal engine games
- generate c++ sdk headers from a ue4/5 game
- load blueprint mods without replacing game files
- inspect and edit game object properties at runtime
- unlock the game console in unreal engine games
- dump usmap files for unversioned properties
- reverse engineer unreal engine game internals

## When to choose
- you want to mod a UE4/5 game with Lua or C++ without modifying game files
- you need runtime introspection of game objects and properties
- you need SDK dumps to build native mods for an Unreal game

## When to avoid
- you need a plug-and-play solution guaranteed to work with every game out of the box
- your target game is not built on Unreal Engine 4.12+ or 5.x
- you only want simple asset swaps that don't require scripting

## Facets
- artifact type: framework
- maturity: active
- function: sdk, plugin-system, interpreter, developer-tools
- domain: gaming-tools
- platform: windows
- tags: unreal-engine, lua-scripting, mod-loader, sdk-generator, reverse-engineering, game-modding, live-property-editor, game-development, automation

## Member repositories
- UE4SS-RE/RE-UE4SS (main) score 67

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:24.369742+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:38:07.837900+00:00, confidence not recorded.
  - readme: https://github.com/UE4SS-RE/RE-UE4SS (fetched 2026-08-28T04:07:24.369742+00:00, sha f42035798056)
  - homepage: http://docs.ue4ss.com/ (fetched 2026-08-29T09:53:12.375315+00:00, sha 6e4a911b5201)
  - site_page: https://docs.ue4ss.com/installation-guide.html (fetched 2026-08-29T09:53:12.384940+00:00, sha 7b18bf184104)
- Data as of 2026-08-30T08:39:29.467469+00:00.