Millimeter - screen ruler

In-app purchases
3.1
1.87K reviews
5L+
Downloads
Content rating
PEGI 3
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About this app

Millimeter is a simple free screen ruler app. You can measure small objects that fit device screen with this ruler. There are no ads in the app for best experience and real full screen measurements.

☛ 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.

You can also customize your app by purchasing extra features or modes.

📏 What you can do in free version of the app:

- Calibrate Millimeter with custom or standard objects
- Ruler Mode for measure in metric and imperial units: mm and inch
- Additional vertical ruler for 2D measurements (📐)
- Area measurement for 2D measurements (⬛)
- Calculate W/H ratio of the rectangular objects in 2D
- Fine grid (1mm for millimeter units) 👍
- Use fractions for inch units
- Read interactive Help / Guide about all available features in a mode
- Use app as standard ruler
- Use full screen mode for better user experience in Ruler mode

💳 You can customize your free version and purchase extra modules and features that add the following functionality:

- Parts Mode to split length or objects in equal parts
- Thread per inch ( TPI ) measurement pattern (🔩) in Parts mode (https://youtu.be/M1Qrbs2bgCY)
- Circle Mode to measure circular objects (🔴)
- Protractor Mode - measure angles (⚪)
- Split circle into equal sector / angle
- Lock / Unlock rulers in any mode for better usability (🔒)
- Set exact size, length, diameter, number of parts manually with keyboard input (⌨)
- Change background to BW night mode for power saving (🔋) and better visualization (🌓)

Use this screen ruler in different areas to measure small objects that fit your phone or tablet screen : jewelry, jewels, rings 💍 , stones, screws, bolts, buttons diameter, nuts, knitting needles, knitting pattern, washers, insects, mosaic tile, hooks, thread, etc.

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

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

📖 More about app: http://goo.gl/304nJB

☎ If you have any problems with the app on your device, please contact [email protected] first and we will help you. Thank you.

VisTech.Projects Team.
Updated on
2 Jan 2025

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 can’t be deleted

Ratings and reviews

3.1
1.76K reviews
Ric Buch
13 May 2025
Does what it says without annoying ads. Screen size calibration didn't work precisely with a Poco F3. I recommend calibration with a credit card.
Did you find this helpful?
vistech.projects
13 May 2025
Thanks a lot for your feedback and support! Glad you found the app useful.
X
9 May 2024
Works as good as I need it to! Checked with a caliper, the initial generic calibration was actually within about 0.2% of being correct (was set initially upon app startup at 4.07"). A clear ruler that can fit flat on your screen would work well for your calibration. Remember, calibrate at the largest size measurement device you can accurately align with on the screen. While app can calibrate with a coin, calibration will have less error at I.E., 5.00" vs 0.75".
8 people found this review helpful
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vistech.projects
9 May 2024
Thank you so much for your feedback and valuable tips for other users! You are correct, use the full size of the screen for calibration to get the best accuracy.
jessica siu
25 February 2023
I used an 8mm earring for measurement and it's really accurate. Even with default calibration it shows what it has to show. With the size of a credit card for calibration it comes as a handy tool too if the default falls short, so it's a well done indeed. So now I can at least have an idea when I online shop how big an object is.
14 people found this review helpful
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vistech.projects
25 February 2023
Jessica, thank you so much for taking the time and share your experience with our app! Glad you found it handy and helpful for your online purchases. You are absolutely right, default calibration works on some devices but any known size object can be used for calibration, so the app should work accurately on any device after calibration.

What's new

v2.3.4 - fixes and improvements for new versions of Android
v2.3 New features:
- fixes
- new Level feature (paid) available in Pro version
v2.2 New features:
- Fine grid
- lock screen
- 2D ruler
- multi touch support (for easy measurements when object touches screen)
- fixes and improvements
v2.1.0 - new Protractor Mode( in-app purchase or in Pro version) for angle measurements: https://goo.gl/wquu2s