Lo Ban AR: Ruler, Compass

Measure length, heading, dates

Free · In-App Purchases · Designed for iPad. Not verified for macOS.

A measuring toolkit: three Lo Ban rulers at true scale, a heading compass, and a calendar. No ruler to hand? Measure with the camera, error band included. A measuring toolkit for carpenters, builders, and anyone renovating a home. LO BAN RULER — AT TRUE SCALE Three rulers built from the original specifications: 52.2 cm, 42.9 cm and 38.8 cm. Enter a measurement and the app shows which segment it falls into on all three rulers at once. What makes it different: the scale on screen is drawn at true 1:1. One centimetre on screen is one centimetre in the world, computed from the physical size of the device in your hand. A calibration screen using a bank card lets you verify it yourself. Edge mode pushes the scale to the very edge of the display so you can lay an object against it. Two-step plus and minus buttons sit either side of the number field, with hold-to-repeat — no deleting and retyping a long number because you were off by a millimetre. HEADING COMPASS A multi-ring dial built after traditional instruments, read from the outer ring inward. Drawn at high resolution and scaled down, so it stays sharp when you zoom. Two colour sets to choose from. Devices without a magnetometer still work fully: type the heading in and every ring still resolves. CALENDAR Lunar and solar calendar, public holidays, and your own events. Notification reminders, with lunar-date recurrence so annual observances do not drift. MEASURE WITH THE CAMERA No ruler to hand? Point the lens instead: mark two points in the room, the app estimates the distance between them and reads it against all three rulers. Every measurement carries an error band, and the app says plainly when a figure is not firm enough to settle a segment — when the band straddles a boundary, or when one end of the line landed on a surface the app inferred rather than saw. It will not settle on a number it does not trust itself. When you need a firm figure, the physical ruler and the number pad are both still there. Camera access is only requested when you open camera measuring or the compass on camera, and declining locks nothing else. ABOUT Free to download, and the compass on camera is free too. An optional one-time Pro purchase unlocks five professional dial tiers and taking photos while measuring with the camera. No subscription, no ads, no account required. Works offline — every calculation runs on the device. The app collects no data and sends nothing to us or any third party. Buying Pro is handled by Apple's App Store. Details in the privacy policy.

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New: the compass on camera (the dial over the live scene, with heading lock) is now free, photos included. Pro, an optional one-time purchase, still unlocks the five professional dial tiers and photos while measuring with the camera. The Compass screen now shows names in your chosen English or Chinese: mountain names at the crosshair, the FACING/SITTING axis labels, and the boundary-jump chips. Minor bug fixes. No subscription, no ads.

Version 1.1.1

The developer, An Vu Ngoc, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary based, for example, on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Provider
    An Vu Ngoc
    Size
    27.4 MB
    Category
    Utilities
    Compatibility
    Requires iOS 15.0 or later.
    • iPhone
      Requires iOS 15.0 or later.
    • iPad
      Requires iPadOS 15.0 or later.
    • iPod touch
      Requires iOS 15.0 or later.
    • Mac
      Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English and 2 more
    • English, Traditional Chinese, Vietnamese
    Age Rating
    00+
    In-App Purchases
    Yes
    Copyright
    © 2026 Lo Ban AR
  • Privacy Policy

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