JustRuler - 実寸定規

Ruler, level & protractor

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

v2.1 adds sequential measurement, reference mode, and voice readout. Turn your iPhone into a real-size ruler, level & protractor. JustRuler turns your iPhone screen into a real-size ruler. When you forgot your tape measure but need a quick check on length, angle, or level, this is the one tool to keep handy. [Key features] - Real-size ruler mode — Place an object on the screen and read the scale. Toggle cm/inch instantly. - Two-line measure mode — Pinch an object between the on-screen lines and read the gap to the millimeter. - Protractor (0°–180°) — Drag the on-screen arm to measure angles. Great for DIY and furniture assembly. - Spirit level — Lay the device flat and the bubble centers. Hold it vertical for a bar-style level. - Calibration — Match your real ruler once and every measurement becomes more accurate. - 5 styles — Classic / Modern / Dark / Metal / Custom Color. [New in v2.1] - Sequential measurement: stack multiple segments and read the running total - Reference mode: set a target value and see the live diff against it - Voice readout: hear values spoken aloud when your hands are full - 31 languages supported [Who it's for] - DIY and craft enthusiasts - Anyone who doesn't want to carry a ruler around - Students, designers, makers Free with one launch interstitial ad. A one-time $0.99 purchase removes ads forever. Privacy Policy: https://kazusa703.github.io/privacy.html Terms of Use: https://kazusa703.github.io/terms.html Support: https://kazusa703.github.io/support.html

Ratings & Reviews

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v2.1 update [New] - Sequential measure mode: add segments and read the total. - Reference mode: set a target via history or input; live diff with haptic + voice when matched. - Voice readout: speaks values as you drag and save, in your language. - 31 languages supported (was Japanese only). [Other] - Internal optimization and bug fixes. Please let us know what you think via Support.

Version 2.1

The developer, atsuko imai, 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 Used to Track You

    The following data may be used to track you across apps and websites owned by other companies:

    • Location
    • User Content
    • Identifiers
    • Usage Data

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Location
    • User Content
    • Identifiers
    • Usage Data

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Usage Data

Privacy practices may vary, for example, based 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

Seller
  • atsuko imai
Size
  • 5.6 MB
Category
  • Utilities
Compatibility
Requires iOS 26.2 or later.
  • iPhone
    Requires iOS 26.2 or later.
  • Mac
    Requires macOS 26.2 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 26.2 or later.
Languages
English and 30 more
  • English, Arabic, Croatian, Czech, Danish, Dutch, Filipino, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Portuguese, Romanian, Russian, Simplified Chinese, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
Age Rating
4+
In-App Purchases
Yes
Copyright
  • © 2026 Issatsu Imai
  • Developer Website
  • Privacy Policy

    • More by atsuko imai

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