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Ruler •

Ruler •

Includes Camera (AR) Ruler

413 ratings
30 reviews
With Ads
🔧 Utilities
📊 Productivity
Free
With Ads

Details

  • Released
  • Updated
  • March 5, 2021
  • April 16, 2026

Features

Developer

Matrix Software Co.
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Ruler • screenshot #1 for iPhone
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About

Measure objects and distances with an on-screen ruler and augmented reality. Supports inches and centimeters, with features for linear sizes, angles, area, volume, and more. Save your measurements for later use.

✓On-screen ruler for small objects
✓Augmented Reality (AR) measuring
✓Measure linear sizes in cm/inches
✓Calculate angles, area, and volume
✓Save measurements
✓Generate plan projections
Show original description

What users say

Summarized from real user reviews of Ruler. Based on 413 reviews and a 4.2/5 average, it highlights the 3 positives and 11 negatives reviewers mention most about this Utilities app.

Positive things

  • 👍Basic caliper and spirit level included
  • ✅Option to opt-out of data selling/sharing
  • 👌Accurate measurements (Arabic review)

Negative things

  • 📏Inaccurate measurements
  • 💥Frequent app crashes
  • 💸Limited free functionality (5" limit)
  • 🚫Cannot switch to metric (cm)
  • 🤷Unclear AR mode usage
  • ❌No save or print option
  • ↩️Unable to exit AR mode
  • ❓No instructions on how to use
  • 📱Assumes a single phone size
  • 📉Ruler markings are incorrect (10ths instead of 16ths)
  • 👎Generally poor user experience
See all reviews

What's New in Ruler

1.5

April 16, 2026

Fixed crash bugs

User reviews

Most RecentHighest RatedLowest Rated

The app still crashes

The app still crashes on my iPhone 17 and IPad after restarting tried everything whenever I measure the height of something, could you please make a new app update? It still hasn’t been fixed yet.
ahardworkerahardworker

Response from developer

Thank you for your feedback, and we’re sorry for the inconvenience. We understand that the app is crashing on both iPhone and iPad when measuring height. This is not the experience we want, and it may be related to device-specific AR processing or a bug in the measurement module. Please make sure you’re using the latest version of the app and restart your device. If the issue continues, contact our support team with your device models and iOS versions so we can investigate and fix it. Thanks for reporting this — it helps us improve stability.

Great app

The app offers everything I needed. Plus it was free with no strings attached or in app purchases. It’s admirable because the app I tried before this had a 3-day trial with $3.99/ month after that just to open the app, no exaggeration. It’s reliable and offers more than its competitors for free.
Great app, well done.
Show more
Everynicknameistaken. XxxxEverynicknameistaken. Xxxx

The app still crashes

The app still crashes on my iPhone 17 and IPad after restarting tried everything whenever I measure the height of something, could you please make a new app update? It still hasn’t been fixed yet?
ahardworkerahardworker

Response from developer

Thank you for your feedback, and we’re sorry for the inconvenience. We understand that the app is crashing on both iPhone and iPad when measuring height. This is not the experience we want, and it may be related to device-specific AR processing or a bug in the measurement module. Please make sure you’re using the latest version of the app and restart your device. If the issue continues, contact our support team with your device models and iOS versions so we can investigate and fix it. Thanks for reporting this — it helps us improve stability.

The app still crashes

The app still crashes on my iPhone 17 and IPad after restarting tried everything whenever I measure the height of something, could you please make a new app update? It still hasn’t been fixed yet.
ahardworkerahardworker

Response from developer

Thank you for your feedback, and we’re sorry for the inconvenience. We understand that the app is crashing on both iPhone and iPad when measuring height. This is not the experience we want, and it may be related to device-specific AR processing or a bug in the measurement module. Please make sure you’re using the latest version of the app and restart your device. If the issue continues, contact our support team with your device models and iOS versions so we can investigate and fix it. Thanks for reporting this — it helps us improve stability.

Basically a sales tool.

Will do nothing except measure 5” without paying. Cannot even switch to metric.
The App world is dying due to the endless useless apps like this one.
ALERT44ALERT44

Response from developer

Thank you for your feedback. We're sorry the app didn't meet your expectations. Could you please let us know which phone model you're using? This information will help us investigate the issue. We appreciate your comments and are always looking for ways to improve the app and user experience.

See 25 more reviews

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User experience

🐞

Reported Bugs

8 issues

App crashes on iPhone 17 and iPad

Bug

App crashes within 1 minute

Bug

AR mode not functional

Bug

Cannot switch to cm

Bug

Measurements are out of scale

Bug

Centimeter measurement is wrong

Bug

Ruler markings are wrong (10ths instead of 16ths)

Bug

iPhone 14 Pro Max measured as over 9 inches

Bug
✨

Requested Features

7 requests

Fix crashing issues

Feature

Enable switching to metric (cm)

Feature

Improve AR mode usability

Feature

Add save and print functionality

Feature

Provide usage instructions

Feature

Ensure accurate scaling for all devices

Feature

Fix ruler marking divisions

Feature

FAQ

What can I measure with this app?

You can measure linear sizes in centimeters and inches, distances using augmented reality, angles, area, perimeter, volume of 3D objects, and the length/area of paths. It also includes an on-screen ruler for measuring small objects directly on your smartphone's screen.

How does the Augmented Reality (AR) feature work?

The AR feature allows you to accurately measure distances from your device's camera to points on a detected 3D plane. This enables you to measure larger objects or spaces that wouldn't fit on your screen.

Is this app free to use?

Yes, the app is free to use. However, it does display advertisements to support its development and maintenance.

Can I save my measurements?

Yes, the app allows you to save your measurements. This is useful for keeping track of dimensions for projects or for future reference.

What devices is this app compatible with?

While specific compatibility details are not provided, AR features typically require devices that support ARKit (for iOS) or ARCore (for Android). The on-screen ruler functionality should be broadly compatible with most smartphones.