Metal Ruler Pro
Digital T-square & scale
$1.99 · Designed for iPad. Not verified for macOS.
The ultimate digital ruler in your pocket. Turn your screen into a professional, hardware-calibrated measurement tool with magnetic drafting and a pure-white Light Box.
Turn your iPhone or iPad into a professional-grade ruler, protractor, and illuminated drafting board. Unlike standard digital measurement apps that rely on generic screen graphics, Metal Ruler Pro uses a custom hardware scanner to calibrate exactly to your specific device’s pixel density. This means 1 cm on your screen is exactly 1 cm in the real world—every single time.
Designed for designers, engineers, crafters, and everyday users, Metal Ruler Pro combines true physical scale with an incredibly intuitive multi-touch physics engine.
CORE FEATURES:
• True-to-Life Calibration: Automatically detects your specific hardware—from the latest iPhone Pro Max to the iPad Mini and 13-inch iPad Pro—for absolute, real-world physical accuracy.
• Light Box Mode: Double-tap the lightbulb to turn your screen into a maximum-brightness, pure-white surface. Perfect for tracing designs, drawing, or reviewing photographic negatives.
• Advanced Multi-Touch: Use one finger to drag, or two fingers to rotate the ruler smoothly across the self-healing cutting mat background.
• Magnetic Snapping & Drafting Grid: Activate the magnet to pull up a dense, professional drafting grid. The ruler snaps to grid intersections and locks perfectly into 0°, 90°, 180°, and 270° angles for flawless straight-line alignment.
• Measurement Lock: Double-tap the ruler body to freeze it in place. Lay physical objects directly on your screen without accidentally ruining your alignment.
• Tactile Feedback: Feel every snap and lock with iPhone Taptic feedback, alongside custom mechanical acoustic "tocks" engineered specifically for iPad users.
• Instant Conversion: Seamlessly toggle between Metric (CM) and Imperial (IN) units with a single tap.
PREMIUM BY DESIGN:
No subscriptions. No accounts. No ads. No data tracking. Just a perfectly engineered, professional measurement tool right in your pocket.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Introducing Drafting Mode! We’ve taken the physical precision of Ruler Pro to the next level by turning your screen into a true professional cutting mat and drafting board.
• Precision Magnet Snapping: Tap the new Magnet icon to activate Drafting Mode. The ruler's zero-point will now strictly magnetize to the major grid intersections whenever it is perfectly horizontal or vertical.
• Dynamic 3-Tier Grid: When Drafting Mode is active, the background intelligently subdivides into a highly visible, professional-grade millimeter (1mm) or imperial (1/8 inch) grid, giving you perfect visual references without cluttering the screen.
• Enhanced Light Box UI: The interface has been completely optimized. The Unit Toggle and the new Magnet icon now seamlessly adapt their colors and glow effects when Light Box mode is active, ensuring you always have full control at maximum brightness.
• Smarter Physics: Diagonal snapping and orthogonal zero-point snapping have been isolated, so the ruler only snaps exactly when and how you expect it to.
The developer, LUIS FERNANDO NASSIF CARBONARI, 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
- LUIS FERNANDO NASSIF CARBONARI
- Size
- 8.4 MB
- Category
- Utilities
- Compatibility
Requires iOS 26.2 or later.
- iPhone
Requires iOS 26.2 or later. - iPad
Requires iPadOS 26.2 or later. - Mac
Requires macOS 26.2 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.2 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Luis F N Carbonari
