Millimeter Pro - screen ruler

1.26K reviews
Content rating
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About this app

Millimeter is a screen ruler app. It uses the full screen of Android devices for distance and length measurements as a caliper or tape measure. Place an object on the scale paper screen and simply touch and move rulers to measure it. Check features for more details. Pro version measures area, circle, radius and diameter, angle, ratio, and splits into equal parts.

NO POP-UP ADS on your screen in the app unlike other free ruler apps on market. The best and real full-screen ruler.

โ˜› ANY DEVICE can be calibrated for accurate measurements in Calibration Mode, where common standard objects (coins, credit cards, etc) can be used as a reference.

More about the app:
Posts about the app:

๐Ÿ“ What you can do in Pro version:

- Calibrate Millimeter with custom or standard objects (๐Ÿ’ณ)
- Ruler Mode for measure in metric and imperial units: mm and inch
- Use fractions for inch units
- Use the app as a standard ruler
- Use full-screen mode for better user experience in Ruler mode
- Additional vertical ruler for 2D measurements (๐Ÿ“)
- Area measurement for 2D measurements (โฌ›)
- Calculate the W/H ratio of the rectangular objects in 2D
- Parts Mode to split length into equal parts
- Thread per inch ( TPI ) measurement pattern (๐Ÿ”ฉ) in Parts mode (

- Spirit/bubble level for checking incline or tilt angle ๐Ÿ”ฎ
- Circle Mode to measure circular objects (๐Ÿ”ด)
- Split circle into equal sectors
- Protractor / Goniometer Mode to measure angles (โšช)
- Lock / Unlock rulers in any mode for better usability (๐Ÿ”’)
- Set exact size, length, diameter, number of parts manually with keyboard input (โŒจ)
- Change background to BW night mode for power saving (๐Ÿ”‹) and better visualization (๐ŸŒ“)
- turn on/of the fine grid (1 mm for millimeter units)
- Read interactive Help / Guide about all available features in a mode

Use this screen ruler in different projects where you need to measure small objects that fit your screen: jewelry, rings ๐Ÿ’, screws and bolts, buttons and beads, nuts and washers, knitting pattern, insects, hooks, thread, etc.

Units: millimeter (mm), inch (in). Fractions are supported for inch units.

Supported languages:
- English, German, Russian, Japanese, and French.

โ˜Ž If you have any problems with the app on your device, please contact first and we will help you. Thank you.

VisTech.Projects Team.

measurement range limited by the size of your screen and with fine calibration, the app gives you accuracy comparable to a standard ruler or measure tape.
Updated on
Nov 3, 2023

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.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Location and App activity
Data is encrypted in transit
Data canโ€™t be deleted

Ratings and reviews

1.22K reviews
Justin Mitchell
January 5, 2024
This app is very accurate. The calibration is a breeze as there's multiple options. I used a U.S. Quarter and it calibrated to a fraction of a millimeter. The price is very minimal, concidering the time and money developers put into creating apps. Contrary to some beliefs, apps are not something we are just entitled to. They take many hours and currency to develop. Do you work somewhere where they hand out the products for free? They do, but if you like it, upgrade to Pro. Its only a couple $.
17 people found this review helpful
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January 5, 2024
Justin, Glad you like the app, and thank you so much for taking the time to provide your feedback and support us! It's very rare to hear such things from a user's side but it's so true. It takes so much effort and resources to develop and support apps. By contributing a little, you help us to keep useful tools on the market. Thanks again!
John Matchett
October 7, 2023
First impressions are very good. Calibration process is a little cryptic. it's unclear why you can't calibrate against a precision ruler rather than a credit card or coin. Typically, I have Vernier caliper on my desk to check dimensions but this app could be a fast and quite accurate way to get measurements from components. Plastic, rubber, paper objects are all fine. Currently I'm struggling with metal components as they interfere with the touch screen. Any suggestions?
6 people found this review helpful
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October 14, 2023
Thank you so much for your feedback and support! Calibration can be done with a known size object, just select the "custom" option instead of a credit card in the calibration screen and enter the value you will be using for calibration. Yes, metal could be a problem on some screens. A touch lock feature or nonconductive bedding can help a bit.
Clarke LAST
April 27, 2024
This app comes in handy whenever I need to measure small objects and I don't have my digital calipers handy. The level and protractor are nice to have in hand too. Very useful for anyone who has projects regularly on the go.
2 people found this review helpful
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April 27, 2024
Thank you so much for the feedback and support! We are happy to hear that it works for you well.

What's new

- fixes and improvements for new versions of Android
- new Level feature
- fixes and improvements

v2.2 New features:
- Fine grid
- multi touch support (for easy measurements when object touches screen)
- fixes and improvements
v2.1 - new Protractor Mode for angle measurements: