a/b Ruler

ab Ruler – Turn Your Smartphone into a Handy Ruler This is a simple and convenient length measurement app that lets you use your smartphone screen as a ruler. It displays a scale on the screen, allowing you to easily measure the length of everyday objects. It supports both cm (centimeters) and inch (inches), so you can switch units depending on your needs. ■ High-Precision Measurement with 3-Point Calibration To compensate for errors caused by smartphone screen size and display environment, it features a 3-point calibration function. By calibrating by specifying three points, you can adjust the on-screen ruler to match the actual length. This is convenient whether you want to use your smartphone as a simple ruler or for more accurate measurements. *Measurement accuracy may vary depending on the device's screen size, settings, and calibration method. ■ Supports Two Units: cm and inch Length is displayed in: ・cm (centimeters) ・inch (inches) You can switch units according to your needs, making it widely usable for everyday length checks and situations where inch notation is required. ■ Convenient for these situations ● When you want to measure a small length You don't need to look for a ruler, but you just want to check a length. In such cases, you can easily measure using only your smartphone. ● When doing origami When folding origami paper into thirds, fifths, etc., you can use it as a guide to determine the folding positions. For example, you can measure the length of paper to determine where to divide it into thirds or fifths, using it as an auxiliary tool for origami and crafts. ● For small measurements in crafts and DIY It's also convenient when you want to check the size of small parts, paper, cards, etc. ● When you want to switch between cm and inches You can switch between displaying centimeters and inches, so you can use it when you want to check sizes in different units. ■ Simple and easy to use right away We've minimized complex operations and made it easy to intuitively check lengths using the on-screen scale. Use it as a simple ruler that you can use immediately by taking out your smartphone when you "just want to measure a length right now." This smartphone ruler can be used in a variety of situations, such as measuring length, checking units, origami, and crafts.