Ruler vs ScreenRuler

Turn your smartphone screen into a precise ruler. Measure real lengths with a simple touch and drag. 【Key Features】 - Touch & drag to measure lengths instantly - Switch between cm and inch units - Real-time measurement display - Automatic PPI detection for accurate results 【Precision Calibration】 - Credit card (85.6mm) calibration for pinpoint accuracy - Saved calibration — set it once, measure anytime - Optimized accuracy per device 【Easy-to-Use Design】 - Clean ruler interface with clear markings - Dark mode support - 10 languages supported - Intuitive unit toggle 【Perfect For】 - Quick measurements when you don't have a ruler - DIY, crafts, and sewing projects - Furniture placement and space planning - Students and professionals on the go No need to carry a ruler — measure anything, anywhere with your phone!

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.