Rules Measure

Rules turns your iPhone and iPad into calibrated, practical measurement tools.

Use Rules to measure with confidence on screen:

• Standard Ruler with imperial and metric units
• Protractor Tool with a draggable ray for angle measurement
• Shape Display for circles, rectangles, triangles, and polygons at real size
• Polygon Tool with perimeter, area, edge lengths, and interior angles
• Actual Size Viewer to display images at true physical size using image DPI metadata

Built for accuracy:

• Per-device display calibration
• Manual calibration override for custom tuning
• Fast unit switching between imperial and metric
• Clean interface optimized for quick, repeatable measurements

Whether you are checking print/layout scale, design dimensions, or geometry, Rules gives you reliable on-screen measuring tools in one app.