Ruler v3.6.2
APK · 1.3 MB · version code 26 · Android 4.1+ · uploaded Jun 24, 2026
- Signature matches the Google Play version Details
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File information
- Version
- v3.6.2 (26)
- Uploaded
- Jun 24, 2026
- Size
- 1.3 MB
- Requires
- Android 4.1+ (API 16)
- CPU support
- Any (no native code)
- Screen
- Small screens and larger
- MD5
- 3702a9e69302330e1fd8bc0e9789c42f
- Signing certificate (SHA-1)
- 84:F7:97:61:36:CF:2F:08:56:9C:58:67:3C:75:B3:50:D7:9A:4B:AD
- Signed by
- CN=Etienne de Maricourt, OU=Home, O=Xalpha Lab, L=Paris, ST=Ile de France, C=FR
- File name
- fr-ecp-ruler-app-26-75342566-3702a9e69302330e1fd8bc0e9789c42f.apk
- Package
- fr.ecp.ruler.app
- Downloads (all versions)
- 1M+
- Age rating
- PEGI 3 · Everyone
What's new in v3.6.2
Fix issues with tall devices such as the Pixel 2 XL, and devices with a notch a the top of the screen.
Add Swedish krona to available currencies for calibration as well as Swedish localization.
Minor UI improvements.
Security & authenticity
Security rating: Trusted
Signing certificate
- Signature matches the Google Play version Checked by the source store on Jun 24, 2026.
- Certificate issued to “Xalpha Lab” This is the certificate of the Google Play version.
Store checks
- Developer signature verified Jun 24, 2026
- Validated against Google Play Jun 24, 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. AAPKs doesn't scan files itself.
How to install Ruler on Android 4.1+
You'll need about 2.6 MB of free space.
- Download the APK — tap Download APK above (1.3 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 fr-ecp-ruler-app-26-75342566-3702a9e69302330e1fd8bc0e9789c42f.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 3702a9e69302330e1fd8bc0e9789c42f. 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 Ruler — 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 4.1+). Download it again, or pick an older version.
- Blocked by Play Protect — Play Protect checks apps from outside the Play Store. Only continue if you trust the source.