Smart Ruler
Smart Ruler Summary
Smart Ruler is a ad-supported Android app in Tools by Smart Tools co.. Released in Jun 2010 (15 years ago). It has about 4.1M+ installs and 13.3K ratings with a 3.52★ (average) average. Based on AppGoblin estimates, it reaches roughly 163.8K monthly active users and generates around $<10K monthly revenue (0% IAP / 100% ads). Store metadata: updated Feb 10, 2026.
Recent activity: 322 installs this week (1.6K over 4 weeks) showing steady growth View trends →
Store info: Last updated on Google Play on Feb 10, 2026 .
3.52★
Ratings: 13.3K
Screenshots
App Description
Measure the length of a small object with your phone.
Smart Ruler is in the 1st set of the Smart Tools collection.
This app measures the length of a small object by touching the screen.
Usage is very simple.
1. Put an object on the screen of your device.
2. Adjust the object to the left of the screen.
3. Touch the screen, adjust the red line and read the length.
* Main features :
- Multi-touch
- Meter <-> Inch
- Background color
- Material design
I calibrated the app on a lot of Android devices. If it is not accurate, you can enter the actual width with [Calibration] menu.
* Pro version added features:
- No ads
- Caliper mode
- Architectural and Engineering scales
- Ruler extension
- Protractor, level, thread pitch
* Do you want more tools?
download [Smart Ruler Pro] and [Smart Tools] package.
For more information, watch YouTube and visit the blog. Thank you.