FPSov - System Overlay for Windows/Linux

Lightweight system monitoring overlay for games and applications on Windows and Linux. Displays FPS, CPU and GPU usage in a transparent window above all other programs.

Features

• Low resource usage - native C++ (Win32 API on Windows, X11/Xlib on Linux)
• Transparent interface - adjustable opacity and positioning
• Flexible configuration - via INI file or graphical utility (Python)
• Always on top - works above games and fullscreen applications
• High DPI support - correct display on any monitor
• Mouse dragging - can be moved anywhere on screen

Displayed Metrics

• FPS - refresh rate / frame rate estimate for the active window
• CPU - processor usage (percentage)
• GPU - graphics card usage (percentage)

System Requirements

Windows

• Windows 10 / 11 (x64)
• CPU with PDH (Performance Data Helper) support
• GPU with DXGI support (DirectX 11/12)

Linux

• X11 (Xorg or Xwayland)
• libX11, libXext
• CPU usage via /proc/stat; GPU usage via sysfs (AMD/Intel) or nvidia-smi (NVIDIA), if available
• python3-tk for the optional graphical settings tool

Installation

Windows

1. Download the latest release from the Releases section
2. Extract the archive to a folder of your choice
3. Run fps-overlay.exe

Linux

1. Download the latest release from the Releases section, or build from source (see src/linux/README.md)
2. Extract the archive to a folder of your choice
3. Run ./fps-overlay

Both platforms create a default overlay.ini next to the executable on first run, and can be customized either by editing that file directly or through the included Python/Tk settings GUI.

Building from source

• Windows: scripts\build_windows.bat
• Linux: scripts/build_linux.sh (or cd src/linux && make)