Free Ruler
A lightweight pair of floating horizontal and vertical rulers for Mac screens.
Useful for comparing on-screen distances without a full design tool.
Independent/grouped rulers and keyboard controls support quick alignment across windows.
Keep in mind: Screen pixels and physical millimeters/inches are not interchangeable without correct display scaling. It does not measure real-world objects through a camera.
Inside the app
Official product images
What you can do
- Horizontal/vertical floating rulers
- Pixels, millimeters and inches
- Grouped movement and keyboard alignment
Good for
- Designers or developers checking a visible layout.
Consider alternatives for
- People needing certified physical dimensions or document geometry extraction.
Limitations & considerations
- Captured minimum: macOS 14.0.
- Screen pixels and physical millimeters/inches are not interchangeable without correct display scaling. It does not measure real-world objects through a camera.
Privacy & permissions
The described task uses local screen positioning rather than document uploads. No account is required by the documented workflow.
Sources & review notes Updated Nov 15, 2026
Reviewed by iApp4Me Editorial Team. Recommendations use the linked documentation and attributed accounts; device observations are identified separately.
- US App Store developer description
Complete description, release notes, download price and compatibility metadata captured 2026-11-02.
- Official developer disclosure
Full cached official text read, captured 2026-11-12; sales channels, separate products and substantive limits distinguished.
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