RulerApp: Ruler & Tape Measure

Level Tool & Decibel Meter

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

Your screen is a true-size ruler; match it with a card. Plus ring sizer, AR measure, protractor, plumb line, decibel meter, Long (slide along) mode and widgets. RulerApp turns your iPhone or iPad screen into a true-size ruler. Lay an object on the screen and read its length in cm or inches. Match the size once with a standard card ("Match Size") for more accurate marks. Beyond the screen, it is a pocket toolbox: a "Long (slide along)" mode for items longer than the screen, AR measuring with the camera, a ring size finder, a protractor, a spirit level, a plumb line and a decibel meter. TRUE-SIZE RULER - On-screen ruler at true scale (cm/inch, marked in 1mm or 1/16-inch steps) - Built-in screen sizes for each iPhone and iPad model, so the marks are right even before you match the size with a card; unknown models are guided to "Match Size" first - "Match Size": hold a standard credit card (85.6mm) to the outline and match the size quickly, in either orientation - Drag start/end markers to calculate the distance between two points - Fine-tune markers in 0.1mm steps with the − / + buttons, and snap them to tick marks for small parts like screws and beads - Each result shows an accuracy estimate (for example ±0.3mm when "Matched with a card") - Works in portrait and landscape (landscape measures farther) LONGER THAN THE SCREEN - "Long (slide along)" mode: mark the end of the screen, slide your device along the object, and the ruler continues from the previous length to give the total - Print a paper ruler with AirPrint and use it without your device AR MEASURE WITH THE CAMERA - Measure walls, desks and objects too big or too far away for the screen - Area of rectangles, volume of boxes, diameter and area of circles - Angles between two lines, height from the floor, and the total length of a multi-segment path - Export what you measured as a floor plan image or PDF with dimensions MORE TOOLS - Ring size finder: place a ring you own on the screen, match the inner circle, and see its US, UK, EU and Japanese sizes with the inner diameter in mm - Photo measure: write the sizes you measured on a photo and share it as one image, for example for a marketplace listing - Protractor: read the angle of an object or drawing placed on the screen - Spirit level: check whether a surface is flat or plumb - Plumb line: a line that always points straight down, with the angle off vertical - Decibel meter: current and maximum sound level (dB estimate) using the microphone - Altimeter: air pressure, relative height change, elevation and coordinates - See online sizes at true scale: share text like "8.6 × 5.4 cm" from Safari to show a rectangle of that size on screen, or type the size yourself - Unit converter for cm / inch / mm, plus day-of-year (Julian date) conversion QUICK TO OPEN Open the ruler in one step from Home Screen and Lock Screen widgets, a Control Center button, the Action button, Siri or Shortcuts. YOUR MEASUREMENTS - Save favorite measurements and recall them instantly - A counter shows how many measurements you saved today, this week and in total. Deleting a saved measurement lowers the count. - Blueprint dark theme: subtle grid lines on a deep blue background Measurements are processed on your device. The microphone is used only to show the sound level; audio is not recorded or saved. After your first measurement, the app may ask once for a rating (within Apple's limits). FREE AND FULL ACCESS Free (with banner ads): the true-size ruler, Match Size, the "Long (slide along)" mode, AR Distance, fine-tuning, protractor, spirit level, plumb line, decibel meter, altimeter, printable ruler, online sizes, unit converter, widgets and Siri, and up to 3 saved measurements. Full Access (one-time purchase, no subscription): ring size finder, AR modes other than Distance with plan export, photo measure, unlimited saved measurements with export, and no ads. Customers who previously bought the paid app keep using it without ads. Privacy Policy: https://smallappworks.com/rulerapp/privacy/ Support: https://smallappworks.com/rulerapp/support/

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- Built-in screen sizes for each iPhone and iPad model, so the ruler is true to size even before you match the size with a card. Unknown models are guided to "Match Size" first. - Match the size with a card in portrait or landscape, and fine-adjust with the shrink/enlarge buttons. - "Long (slide along)" mode: slide your device along longer objects and the ruler continues to show the total length. - Fine-tune markers in 0.1mm steps and snap them to tick marks. - Each measurement now shows an accuracy estimate. - New tools: AR measure with the camera, photo measure, protractor, printable ruler, ring size finder, online sizes at true scale, plumb line, altimeter and decibel meter. - The unit converter now also converts day-of-year (Julian) dates. - Open the ruler from Home and Lock Screen widgets, Control Center, the Action button, Siri or Shortcuts. - Free: ruler, Match Size, the "Long (slide along)" mode, AR Distance, protractor, spirit level, plumb line, decibel meter, altimeter and more. Full Access (one-time purchase): ring size finder, AR modes other than Distance with plan export, photo measure, unlimited saved measurements with export, and no ads. - No banner ad on the ruler screen while you measure. - History shows how many free saves you've used (of 3), with a shortcut to Full Access. - Ads ask for your tracking permission first. You can decline and keep using the app. - Improved translations in Settings, error messages and exported images. - New short how-to guides for first-time users (3 pages on first launch and a tip in each tool), and clearer words on screen, such as "Single" / "Long (slide along)" and "Match Size".

Version 1.0.7

The developer, Takumi Sekiguchi, 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:

    • Identifiers
    • Usage Data

  • Data Linked to You

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

    • Location
    • Identifiers
    • Usage Data

  • Data Not Linked to You

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

    • Diagnostics

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
Takumi Sekiguchi
Size
10 MB
Category
Utilities
Compatibility
Requires iOS 16.0 or later.
  • iPhone
    Requires iOS 16.0 or later.
  • iPad
    Requires iPadOS 16.0 or later.
  • Mac
    Requires macOS 13.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English and 14 more
  • English, French, German, Hindi, Indonesian, Italian, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Thai, Traditional Chinese, Turkish, Vietnamese
Age Rating
4+
In-App Purchases
Yes
Copyright
© 2026 Small App Works
  • Developer Website
  • Privacy Policy

    • More by Takumi Sekiguchi

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