Ruler: Measure, Level & Angle

Turn your phone into a complete measurement toolkit with Ruler: Measure, Level & Angle. Whether you're measuring furniture, checking if a shelf is level, finding the angle of a surface, or estimating dimensions on the go, Ruler gives you a collection of accurate, easy-to-use tools in one clean and intuitive app.

Perfect for DIY projects, home improvement, students, designers, craftsmen, and everyday tasks, Ruler helps you measure with confidence wherever you are.

📏 Measure with Powerful Built-in Tools

• On-screen ruler with centimeter and inch support
• Multiple ruler-edge modes for different measuring situations
• Extend measurements beyond your screen by adding multiple measurements together
• Measure rectangles with automatic width, height, and area calculation
• Measure circles with diameter and related values
• Measure triangles for practical shape calculations
• Full-screen protractor with independently adjustable angle guides
• Angle Finder using your device's motion sensors
• Bubble Level for checking horizontal and vertical surfaces
• Built-in unit converter for common length and area units
• Handy reference sizes for cards, paper, and photos

🎯 Calibrated for Your Device

Every phone has a different screen size and pixel density. Ruler includes a simple guided calibration process using a standard bank card, allowing the on-screen ruler to closely match real-world measurements on your device.

💾 Save & Organize Measurements

Keep your important measurements organized and easy to find.

• Save measurements with custom titles and notes
• Mark measurements as favorites
• Edit saved records anytime
• Recover accidentally deleted measurements from Recently Deleted

✨ Designed for Everyday Use

• Clean, full-screen measuring tools
• Portrait and landscape layouts where appropriate
• Light, Dark, and High Contrast themes
• Optional haptic feedback
• Optional Keep Screen On mode while measuring
• Adjustable screen-edge offset for improved accuracy
• Tick-mark snapping for precise adjustments
• Custom inch fraction precision

🔒 Private by Design

Your measurements stay on your device unless you choose to export or share them. No account is required, and the core measuring tools work completely offline.

Important

Measurement accuracy depends on proper screen calibration, your device's sensors, and how the phone is positioned. Ruler is designed for everyday measuring and reference. It should not replace certified professional measuring equipment where safety, legal compliance, or engineering-grade precision is required.