Ruler

Contains ads
4.4
113K reviews
10M+
Downloads
Content rating
Everyone
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About this app

Measure anything with your phone easily and accurately.

Ruler App turns your smartphone into a simple and reliable measurement tool. Use it at home, at work, or for school. Quickly measure objects, lines, and angles with ease.

Features:

📏 Digital ruler and tape measure – measure length and size directly on your screen
📱 Screen ruler – convenient for quick measurements
🔢 Unit converter – switch between inches, centimeters, and millimeters
📐 Measure objects and lines – check distance, width, or diameter
⚙️ Caliper mode – precise measurements for small objects
📊 Protractor – measure angles up to 360°
🛠 Multiple modes – point, line, level, and screen measurement

Benefits:

✅ Fast and accurate results
✅ Easy to calibrate and use
✅ Clear, simple interface
✅ Useful for DIY projects, school, office, and everyday tasks

This all-in-one measurement app helps you measure length, distance, and angles whenever you need. Keep a digital ruler and tape measure always in your pocket.
Updated on
Jan 19, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
App activity, App info and performance, and Device or other IDs
This app may collect these data types
App activity, App info and performance, and Device or other IDs
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

4.4
111K reviews
Jerry L
March 5, 2026
This one "just works." And there are some optional settings that can be helpful. like cm or inches. I'm not sure if it can measure an object with the camera. I'm going to pay for the pro version just to support the developer. All the other rulers & tape measure apps had extremely intrusive ads, and I could never get the actual app to function.
5 people found this review helpful
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Sourabh Das
October 14, 2025
It takes over half an hour to manually go through and uncheck every data tracking company that wants to track your data through this app. They technically allow you to opt out, but if you have to do each one manually and there's so many that it takes you literally half an hour, then its unreasonable for anyone to spend that long on it and they're hoping you give up. They follow the letter of the law, but certainly not the spirit.
101 people found this review helpful
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NixGame
October 31, 2025
Thanks for your feedback! It’s a standard user consent, but we’re working to make the process simpler and more comfortable for users.
PiroChu
July 9, 2024
I like the simplicity without unnecessary bells/whistles, just what i was looking for. Nice to simultaneously show inches and centimeters. However, this app only shows in landscape mode and can't flip to portrait mode. Moreover, it also locks up the phone in landscape mode and I can't get back to portrait mode unless I close this app first, which is a pain. I found a similar simple ruler app that can automatically flip between portrait and landscape, so I'll go with that one instead.
64 people found this review helpful
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What’s new

Bug fixed