Smart Ruler

Measure the length of a small object with your phone.

Smart Tools co. · kr.sira.ruler

5.0 out of 5 (1 rating) 1M+ downloads v1.6.4 4.8 MB Android 4.1+ PEGI 3 · Everyone

Download APK 4.8 MB All versions

Watch the Smart Ruler trailer on YouTube

At a glance

Latest version: v1.6.4 (54)
Updated: Mar 4, 2022 (4 years ago)
APK size: 4.8 MB
Requires: Android 4.1+ (API 16)
CPU support: Any (no native code)
Category: Tools (app)
Listed since: Apr 19, 2021 (at least)
Permissions: 8
Website: androidboy1.blogspot.com/2016/01/smart-ruler-v15.html
Developer contact: [email protected]
Privacy: Developer's privacy policy

About this APK

Smart Ruler is an app by Smart Tools co. in the Tools category, listed since at least April 2021. It has no native code, so it runs on any Android processor.

It asks for 8 permissions, none of them sensitive. The app can read the advertising ID that ad and analytics services use.

What's new in v1.6.4

- v1.6.4 : Support for Android 12 - v1.6.3 : Lock button added

Description

From the listing uploaded by “appupdater”.

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.

Security & authenticity

Security rating: Trusted

Signing certificate

Certificate issued to “Min-Kyu Ryoo” Not the developer's name (“Smart Tools co.”). Names in certificates can't be verified, so this alone proves nothing.

Store checks and file details

Developer signature under review May 8, 2025
Antivirus scan result not available
Signed byCN=Min-Kyu Ryoo, L=Seoul
Signing certificate (SHA-1)EF:45:BA:CD:52:C2:58:43:70:59:84:10:9B:7A:88:3C:B7:E9:2A:81
File MD59fbd02ea697cc226c8e7838358b6162e
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures. AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (8)

Smart Ruler requests 8 permissions, none of them sensitive.

Advertising ID com.google.android.gms.permission.AD_ID
Control vibration android.permission.VIBRATE
Full network access android.permission.INTERNET
Google Play install referrer com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE
Prevent the device from sleeping android.permission.WAKE_LOCK
Run at startup android.permission.RECEIVE_BOOT_COMPLETED
Run foreground services android.permission.FOREGROUND_SERVICE
View network connections android.permission.ACCESS_NETWORK_STATE

Smart Ruler APK: questions and answers

Can I install this APK over the version I already have?

Only if it is signed with the same certificate as the copy on your phone and isn't an older version. If Android says “App not installed”, the certificates differ; uninstalling your copy first works but deletes its data unless it is backed up.

Is the Smart Ruler APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. After downloading, check that the file's MD5 is 9fbd02ea697cc226c8e7838358b6162e.