ScreenRuler - Measure Length
Real cm & inch ruler on screen
Free · Designed for iPad. Not verified for macOS.
Your iPhone is now a ruler. Measure anything in cm or inch — accurate to the millimeter, calibrated to your screen.
Turn your iPhone into a precise ruler — no physical ruler needed.
ScreenRuler uses your device's actual pixel density (PPI) to display accurate centimeter and inch graduations directly on screen. Place any object alongside the ruler and drag two handles to measure it instantly.
HOW TO MEASURE
1. Place the object next to the left edge of the screen
2. Drag the top and bottom handles to align with the object's edges
3. Read the live measurement displayed between the handles
FEATURES
• Accurate ruler based on your iPhone's true screen PPI
• cm mode: 1 mm graduations, labeled every 1 cm
• inch mode: 1/8 inch subdivisions, labeled every 1 inch
• Two drag handles for precise range selection
• Live measurement display — updates as you drag
• Switch between cm and inch instantly
• DPI calibration using a standard credit card (short edge 5.4 cm) for extra precision
• Haptic feedback at every 1 cm / 1 inch boundary
• Dark and light theme
• Works offline — no internet required
• Collapsible control panel — stays out of the way
CALIBRATION
Every iPhone screen has a slightly different physical size. Use the built-in DPI calibration with a standard credit card to fine-tune accuracy to your exact device.
Perfect for quick measurements when you don't have a ruler on hand.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, pilyeong heo, 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
- pilyeong heo
- Size
- 27.1 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 9 more
- English, French, German, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Thai, Traditional Chinese
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © pilyeooong