Real Ruler

Turn your smartphone or tablet into a highly accurate, feature-rich screen ruler!

Real Free Ruler is a lightweight, intuitive, and completely free tool designed for instant and precise measurements on the go. Whether you need to measure small objects, sketch designs, or align components, Real Free Ruler offers a professional-grade calibration tool and advanced features to ensure accuracy down to the millimeter.

Key Features:
• Multi-Edge Measurement: Activate rulers on any edge of your screen—left, right, top, or bottom—separately or all at once.
• High Precision: Change units instantly between metric (centimeters, millimeters) and imperial (inches, fractions).
• Smart Calibration: Detects your phone or tablet's factory PPI (Pixels Per Inch) database instantly. Need absolute precision? Use the interactive manual calibration tool to calibrate against a real-world object (like a credit card or standard physical ruler).
• Interactive Guidelines & Crosshairs: Tap anywhere on the canvas to place precise horizontal and vertical guides for measuring complex items, coordinates, or pixel dimensions.
• Dark & Light Modes: A sleek, modern user interface designed to match your preference and save battery life.
• Zero Distractions: Clean fullscreen mode to maximize your screen space and hide the status bar while measuring.

How to get the most accurate measurements:
1. When you first open the app, it automatically attempts to identify your device model and set the correct PPI.
2. For guaranteed pixel-perfect accuracy, open the Calibration settings.
3. Align the on-screen card guide with a physical standard card (like a debit or credit card, or a physical ruler).
4. Save the settings, and your ruler is calibrated!

No hidden subscriptions, no paywalls—just a straightforward, reliable ruler whenever you need it.

Download Real Free Ruler today and get measuring!