PlatynUI Inspector

platynui-inspector is a small desktop app for looking at the UI tree that PlatynUI sees. Use it to explore windows and controls, inspect attributes, test what is visible to the accessibility backend, and briefly highlight selected elements on screen.

Install

uv tool install --prerelease allow platynui-inspector

Inside an existing virtual environment:

uv pip install --pre platynui-inspector
# or
pip install --pre platynui-inspector

Windows and Linux are the active targets. macOS packages currently contain stub backend support.

Run

platynui-inspector

The left side shows the desktop UI tree. Selecting an element shows its attributes on the right and, when bounds are available, highlights it on screen for a moment.

Theme and settings

By default the inspector follows the system's light or dark theme. --theme system|light|dark, or the environment variable PLATYNUI_INSPECTOR_THEME, sets one for a single run.

Settings changed in the inspector — the picker key combination, the toolbar style, the theme — are saved to platynui/inspector.ron in the user's configuration directory (%APPDATA% on Windows, $XDG_CONFIG_HOME or ~/.config on Linux). PLATYNUI_INSPECTOR_SETTINGS_PATH points the inspector at another settings file.

Search result limit

The inspector limits XPath search collection to the first 5000 results by default so broad queries stay usable in an interactive UI. Override the limit with a command-line option:

platynui-inspector --search-result-limit 10000
platynui-inspector --search-result-limit unlimited

Or use the equivalent environment variable:

PLATYNUI_INSPECTOR_SEARCH_RESULT_LIMIT=10000
PLATYNUI_INSPECTOR_SEARCH_RESULT_LIMIT=unlimited

Command-line options take precedence over environment variables. Values 0, off, disabled, disable, none, and unlimited disable the guard.

Rendering options

The inspector ships with both wgpu and glow renderers. wgpu is the default; glow can be useful in virtual machines or older graphics stacks.

Command-line options take precedence over environment variables:

platynui-inspector --renderer glow --glow-hardware-acceleration off

Equivalent environment variables:

PLATYNUI_INSPECTOR_RENDERER=glow
PLATYNUI_INSPECTOR_GLOW_HARDWARE_ACCELERATION=off

Supported renderer values are wgpu and glow. Supported glow hardware acceleration values are required, preferred, and off.

The glow hardware acceleration setting applies to the glow renderer only. When glow is selected, off is treated as a best-effort request. Some Windows systems do not expose a software-only OpenGL configuration, so the inspector falls back to preferred instead of failing during window creation.

The wgpu renderer does not use the glow hardware acceleration setting. It can be influenced through the environment variables supported by wgpu itself:

WGPU_POWER_PREF=low      # low, high, or none
WGPU_BACKEND=dx12        # comma-separated: dx12, vulkan, gl, metal

WGPU_POWER_PREF changes adapter preference, such as low-power versus high-performance devices. WGPU_BACKEND limits which graphics backends wgpu may try. These settings do not force pure software rendering, but they are useful when diagnosing virtual machine or driver-specific rendering behavior.

On Windows, the inspector uses Vulkan or DX12 by default, with Vulkan preferred when available. OpenGL is not tried automatically because it can make startup noticeably slower on some systems. If you need to test OpenGL anyway, start the inspector with WGPU_BACKEND=gl.

Notes

• On Linux/X11, make sure accessibility is enabled and AT-SPI is running.
• On Windows, UIA is available by default, but elevated applications may require matching privileges.
• If a highlighted element is missing or empty, the application may not expose usable bounds through the platform backend.

More information

• PlatynUI README - project overview.
• Contributing guide - building from source and contributing.

License

Apache-2.0. See the repository's LICENSE file.