Prime Ruler - length measurement by camera, screen v5.1.2
APK · 4.2 MB · version code 74 · Android 4.0+ · uploaded Jul 6, 2026
- Signature matches the Google Play version Details
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File information
- Version
- v5.1.2 (74)
- Uploaded
- Jul 6, 2026
- Size
- 4.2 MB
- Requires
- Android 4.0+ (API 14)
- CPU support
- x86 32-bit, ARM 32-bit, ARM 64-bit
- Screen
- Small screens and larger
- MD5
- 3f3d3392e63063a89a39c0018b7caae8
- Signing certificate (SHA-1)
- 2A:BE:7D:A2:82:8C:BB:95:DF:62:CD:AB:97:74:A8:78:17:A8:F3:14
- Signed by
- CN=Pavel Prybytak, C=UK
- File name
- com-grymala-photoruler-74-75543794-3f3d3392e63063a89a39c0018b7caae8.apk
- Package
- com.grymala.photoruler
- Downloads (all versions)
- 10M+
- Age rating
- PEGI 3 · Everyone
What's new in v5.1.2
Augmented reality (AR) measurements.
Bug fixes for Android 8.0 Oreo.
Permissions (10)
This version requests 10 permissions, 3 of them sensitive.
- Camera Sensitive android.permission.CAMERA
- Modify shared storage Sensitive android.permission.WRITE_EXTERNAL_STORAGE
- Read shared storage Sensitive android.permission.READ_EXTERNAL_STORAGE
- Control vibration android.permission.VIBRATE
- Full network access android.permission.INTERNET
- In-app purchases (Google Play Billing) com.android.vending.BILLING
- Prevent the device from sleeping android.permission.WAKE_LOCK
- Push messaging (app-defined) com.grymala.photoruler.permission.C2D_MESSAGE
- Receive push notifications com.google.android.c2dm.permission.RECEIVE
- View network connections android.permission.ACCESS_NETWORK_STATE
Security & authenticity
Security rating: Trusted
Signing certificate
- Signature matches the Google Play version Checked by the source store on Jul 6, 2026.
- Certificate issued to “Pavel Prybytak” This is the certificate of the Google Play version.
- Same certificate as the other version checked
Store checks
- Developer signature not checked yet Jul 6, 2026
- Validated against Google Play Jul 6, 2026
- Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020
Scans come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (1 other version compared). AAPKs doesn't scan files itself.
How to install Prime Ruler - length measurement by camera, screen on Android 4.0+
You'll need about 8.3 MB of free space.
- Download the APK — tap Download APK above (4.2 MB). Chrome shows “File might be harmful” for every APK file; choose Download anyway only if you trust this file.
- Open the file — tap the download notification, or open Files › Downloads and tap com-grymala-photoruler-74-75543794-3f3d3392e63063a89a39c0018b7caae8.apk.
- Allow the install (first time only) — Android 8 and later asks for permission the first time an app opens an APK: tap Settings in the prompt, turn on Allow from this source, then go back. Manual path: Settings › Apps › Special app access › Install unknown apps (on Samsung: Settings › Apps › ⋮ › Special access). On Android 7 and older: Settings › Security › Unknown sources.
- Check the file (optional) — the MD5 of the downloaded file should be 3f3d3392e63063a89a39c0018b7caae8. If it differs, the file is damaged or was changed: delete it and download again.
- Tap Install — Android asks “Do you want to install this app?”. If Google Play Protect shows a warning, read it before you continue: the source store rated this file Trusted, but only install apps from sources you trust. If an earlier version is installed, this one only installs as an update when it is signed with the same certificate (SHA-1 shown above).
- Open Prime Ruler - length measurement by camera, screen — tap Open on the install screen, or find it in your app drawer.
Common install problems
- “App not installed” — a version signed with a different certificate, or a newer version, is already installed (Android doesn't allow downgrades). Uninstall it first; back up your data, because uninstalling deletes it.
- “There was a problem parsing the package” — the file is incomplete, or your Android is too old (this version needs Android 4.0+). Download it again, or pick an older version.
- “App not compatible with your device” — this build contains native code for x86 32-bit, ARM 32-bit, ARM 64-bit only. Devices with other processors can't install it.
- Blocked by Play Protect — Play Protect checks apps from outside the Play Store. Only continue if you trust the source.