Pixel Ruler — Edge Detect
Auto Edge Detect Screen Ruler
Only for Mac
Free · In‑App Purchases
Mac
Pixel Ruler is a free menu bar tool for macOS that measures any UI element on your screen with automatic edge detection. Just press Cmd+Shift+M, hover over a button, icon, or layout block, and the dimensions appear instantly — copy them as CSS, SwiftUI, Tailwind, or your own template.
— BUILT FOR DESIGNERS AND FRONTEND ENGINEERS —
When you compare a Figma design against a built UI, you don't want to drag, zoom, and count pixels by hand. Pixel Ruler reads the pixels directly from your screen and finds the boundaries for you.
— FEATURES —
• Auto edge detection in 4 directions (left / right / up / down)
• Drag mode for arbitrary rectangles, ±1px keyboard fine-tuning
• Pin multiple measurements on screen with Shift+click
• Save annotated screenshots (Cmd+S) with measurement lines baked in
• Copy formats: CSS, SwiftUI, Tailwind, or your own custom template
• Multi-display aware — keyboard shortcuts follow the cursor
• Menu bar app with Cmd+Shift+M global hotkey
• Native ScreenCaptureKit, no Accessibility permissions required for the hotkey
— PRIVACY-FIRST —
Pixel Ruler is fully offline. No analytics, no ads, no data collection, no account required. The Screen Recording permission is used only to read pixel colors for edge detection — your screen content never leaves your Mac.
— TIP JAR —
Pixel Ruler is free and stays free. If it saves you time, you can leave a small tip from the Settings panel. All features work the same whether you tip or not.
— REQUIREMENTS —
macOS 14 (Sonoma) or later.
Screen Recording permission required for edge detection mode (optional — Drag mode works without it).
— SUPPORT —
Privacy Policy: https://hattou.com/apps/pixel-ruler/privacy.html
Support: https://hattou.com/apps/pixel-ruler/support.html
Email: support@hattou.com
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Stability improvements and minor refinements.
The developer, HATTOU LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- HATTOU LLC
- Size
- 288.2 KB
- Category
- Developer Tools
- Compatibility
Requires macOS 14.0 or later.
- Mac
Requires macOS 14.0 or later.
- Mac
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- 大感謝 $9.99
- ありがとう寄付 $4.99
- ちょこっと感謝 $0.99
- Copyright
- © 2026 HATTOU LLC