ScreenRuler vs EasyRuler

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.

Check the size of small everyday objects with the iPhone or iPad you already have with you. EasyRuler keeps the whole screen available for measuring, with the controls there when you need them. A ruler across the whole screen Read metric and imperial markings side by side. Use the clean static ruler, or switch to two movable markers and read the distance between them. Turn your device to use portrait or landscape. Match the whole scale Place a real ruler alongside your device, align the zero marks and adjust the full visible scale. Compare the far end and the marks in between as the screen updates. Save when ready, or cancel without replacing your previous calibration. A standard bank card reference is available when no ruler is nearby. Fine adjustments, fewer accidental taps Use the plus and minus controls to move either marker in 0.1 mm steps. Lock the aligned markers, then tap a blank area to hide or show the unlock button. When unlocked, a tap on the ruler hides or shows the normal controls. Simple by design Pay once to download; all features are included. No ads, subscriptions, in-app purchases or accounts. Measuring and calibration work offline. Settings are saved locally, and your measurements are not uploaded to us. The interface follows your device's light or dark appearance. Before measuring Accuracy depends on the device, your calibration reference and how you align it. The 0.1 mm adjustment step does not guarantee 0.1 mm physical accuracy. Use a reliable real ruler and check several marks before relying on a reading. The available measuring span depends on your screen size. EasyRuler is for everyday checks on the built-in screen, not professional or safety-critical measurement. External displays are not supported. For iPhone and iPad with iOS or iPadOS 16 or later.