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RED4ext

RED4ext is a free Windows script extender and plugin manager for Cyberpunk 2077.

Place
#6 of 26
Score
6.3
RED4ext's website

What RED4ext is

RED4ext is a free Windows script extender and plugin manager for Cyberpunk 2077. It lets modders interact with or expand the game’s scripting system, and loads plugins for supported game runtime versions. Plugins can add features, alter game behavior, add scripting functions, or call existing game functions. RED4ext.SDK gives developers access to the scripting virtual machine, native classes and functions, and reversed game structures. Plugins must build for x86-64 and use the __fastcall calling convention; the development guide lists CMake, Premake, and Visual Studio as toolchain examples. Plugins can specify supported runtime versions, target the latest defined runtime, or work independently of runtime versions. The tool also supports custom game states that run code before or after game systems become available. Each plugin gets a logger, and its named log file is created under the game’s red4ext/logs directory when it first logs. Configuration is stored in a TOML file named config.ini, generated with defaults at startup if absent. Installation requires Visual C++ Redistributable 2022.

Good

  • Free plan for Cyberpunk 2077 modding.
  • Loads plugins according to game runtime support.
  • SDK exposes the game's scripting VM.
  • Configuration can disable or ignore plugins.

Watch out

  • Windows platform only.
  • Requires Visual C++ Redistributable 2022.
  • Plugins must use x86-64 and __fastcall.

Who it suits

RED4ext suits Cyberpunk 2077 modders building or managing plugins for a Windows game installation. Developers need to target x86-64 and use the __fastcall calling convention.

Verdict

RED4ext provides plugin loading and scripting-system access for Cyberpunk 2077 mod development. Its runtime controls, logging, and configuration options are relevant to plugin authors, while the build and installation requirements are important to account for.

Plans and prices

From RED4ext's own pricing page, checked 8 Oct 2026.

All about pricing
PlanPriceWhat it gives you
RED4extFreeScript extender and plugin manager for Cyberpunk 2077

The facts

Each one read from RED4ext's own pages, with the date it was checked.

What it does

Compatibility
Plugin builds must target x86-64 and use the __fastcall calling convention.checked 8 Oct 2026
Configuration
The configuration file is red4ext/config.ini in the game directory and is automatically created with default values when the game starts if missing.checked 8 Oct 2026
Developer console
The configuration can enable an external console described as useful for development and can pause the process until a debugger attaches.checked 8 Oct 2026
Developer SDK
RED4ext.SDK provides access to the game's scripting VM, creation of native classes and functions, and reversed game structures.checked 8 Oct 2026
Game states
Plugins can attach custom game states to run code before or after game systems, such as the scripting system, are available.checked 7 Oct 2026
Installation
Installation involves downloading the latest ZIP, extracting it into the game directory, and launching the game.checked 8 Oct 2026
Latest release
The latest release page lists v1.30.0 and includes ZIP downloads with SHA256 hashes.checked 8 Oct 2026
License
The GitHub repository lists the project under the MIT license.checked 8 Oct 2026
Logging
Configuration supports global log levels, log flushing, a maximum number of rotated files, and a maximum log file size.checked 8 Oct 2026
Plugin compatibility
A plugin can declare the game runtime versions it supports, and RED4ext will load it only when the game's version matches; plugins can also target the latest defined runtime or be runtime-independent.checked 7 Oct 2026
Plugin controls
Configuration options can disable the plugin system or ignore specified plugins.checked 7 Oct 2026
Plugin development
Plugins can be built with any toolchain that produces x86-64 output using the __fastcall calling convention; the guide lists CMake, Premake, and Visual Studio as examples.checked 7 Oct 2026
Plugin features
Plugins can add features, modify game behavior, add scripting functions, or call existing game functions.checked 8 Oct 2026
Plugin loader
The RED4ext component manages plugins and loads them for the specified game version.checked 7 Oct 2026
Plugin management
RED4ext loads plugins and manages them for the specified game version.checked 8 Oct 2026
Plugin setup
Plugins are placed in the game's red4ext/plugins directory or a subdirectory within it.checked 8 Oct 2026
Prerequisite
The installation guide says Visual C++ Redistributable 2022 must be installed.checked 8 Oct 2026
Purpose
RED4ext is a script extender for Cyberpunk 2077 that lets modders interact with or extend the game's scripting system.checked 8 Oct 2026
SDK
RED4ext.SDK can be used to interact with the game's scripting VM, create native classes or functions, and use reversed game structures.checked 7 Oct 2026
Uninstallation
To uninstall RED4ext, remove d3d11.dll, powrprof.dll, or winmm.dll from the game's bin/x64 directory, and optionally remove its red4ext directory.checked 7 Oct 2026
Version support
A plugin can specify the game runtime version it supports, and RED4ext loads it only when the game's version matches unless the plugin targets the latest or is runtime independent.checked 8 Oct 2026

Where it runs

Platform requirement
The plugin development guide requires x86-64 output and the installation guide directs users to the x64 Visual C++ Redistributable; these pages describe a Windows game installation.checked 7 Oct 2026

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