SteamFlow

A custom, lightweight Steam launcher and client written in Rust.

SteamFlow is the modern successor to the OpenSteamClient project, leveraging Rust for performance, safety, and a better developer experience. It uses steam-vent for Steam network communication and egui for the user interface.

Current development status

SteamFlow is in active development and serves as the primary project. It has reached a highly functional alpha state, supporting core Steam features like authentication, library management, game installation/updates, and cloud synchronization.

SteamFlow Roadmap

• Authentication
  • Login with password
  • Steam Guard (Email/Device codes)
  • Steam Guard Mobile App confirmation
  • Session restoration (Refresh tokens)
• Library
  • Fetch owned games from Steam
  • Scan local installed games
  • Display game covers (automated caching)
  • Basic game launching
  • Search & Filtering
• Installation & Updates
  • Download pipeline (Manifest -> Security -> Chunks)
  • Update management
  • Uninstall support
  • Verify Integrity
• Features
  • Collections / Categorization
  • Friends list & Chat
  • Steam Cloud integration
  • Workshop management
  • Proton/Wine integration improvements
  • Depot browser (Download specific builds/files)

Getting Started

Prerequisites (Linux)

Ensure you have the following system dependencies installed (Ubuntu 24.04 example):

sudo apt-get update
sudo apt-get install build-essential pkg-config libssl-dev libx11-dev libxi-dev libxrandr-dev libxinerama-dev libxcursor-dev libxkbcommon-dev libasound2-dev libudev-dev libwayland-dev libgtk-3-dev libpulse-dev libdbus-1-dev libegl1-mesa-dev libgles2-mesa-dev liblzma-dev

Build and Run

1. Clone the repository:

git clone https://github.com/OpenSteamClient/OpenSteamClient.git
cd OpenSteamClient

2. Build and run:

cargo run --release

Configuration

SteamFlow stores its configuration and local data in ./config/SteamFlow relative to the executable.

• Library Path: By default, SteamFlow attempts to detect your existing Steam installation. You can manually override this in the Settings panel within the application.
• Session: Encrypted refresh tokens are stored in session.json to allow automatic login on subsequent launches.
• Unified Download Pipeline: All game installations, updates, and integrity verifications use a robust, single-engine architecture for maximum reliability and speed.

Features & Goals

• No Web Technology: Unlike the official Steam client, SteamFlow does not use CEF or WebViews for its core interface, making it extremely lightweight.
• Fast and Responsive: Built with Rust and egui for a native, snappy experience.
• Privacy Focused: Open-source implementation of Steam protocols.
• Linux First: Great support for Linux, including 64-bit clean architecture and better Proton management.

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Contributing

See CONTRIBUTING.md for guidelines.

Acknowledgments

Special thanks to the developers of OpenSteamClient and steam-vent for their invaluable reverse-engineering documentation.

Powered by steam-cdn (Vendored & Modified) and zip crate.

Credits

• OpenSteamClient - Original project and resource base
• steam-vent - Steam protocol implementation
• egui - Immediate mode GUI library
• open-steamworks - Research resources

Q&A

Is this a full replacement for Steam?

SteamFlow aims to provide a lightweight alternative for launching games and managing your library. Some features like VAC-secured games or ISteamHTMLSurface (Source engine MOTDs) may never be supported due to proprietary limitations.

Is it safe to use?

SteamFlow uses official Steam protocols. However, it is a 3rd-party client and is not endorsed by Valve. Use at your own risk.