Digital Slide Rule v4.06.06
APK · 44.2 MB · version code 4006006 · Android 2.3+ · uploaded Jul 9, 2020
- Signature matches the Google Play version Details
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File information
- Version
- v4.06.06 (4006006)
- Uploaded
- Jul 9, 2020
- Size
- 44.2 MB
- Requires
- Android 2.3+ (API 9)
- CPU support
- ARM 32-bit
- Screen
- Small screens and larger
- MD5
- 14ee5e9f4ef33dbfeb01dc8e19d6bbe4
- Signing certificate (SHA-1)
- A8:F8:5A:0E:AE:F1:42:F8:58:5C:14:68:34:40:81:67:2A:8A:42:E0
- Signed by
- CN=Animated Software Co., OU=Developers, O=Slides, C=US
- File name
- air-digitalsliderule20160505a-4006006-52320905-14ee5e9f4ef33dbfeb01dc8e19d6bbe4.apk
- Package
- air.DigitalSlideRule20160505A
- Downloads (all versions)
- 10K+
- Age rating
- PEGI 3 · Everyone
What's new in v4.06.06
Faster setup time after program is loaded (as much as 50% faster); streamlined internal processing (especially of Cylindrical Slide Rule); corrected "Display Estimated Hairline Values" for several of the alternate scales.
Permissions (3)
This version requests 3 permissions, none of them sensitive.
- Full network access android.permission.INTERNET
- View Wi-Fi connections android.permission.ACCESS_WIFI_STATE
- 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 Aug 8, 2025.
- Certificate issued to “Slides” This is the certificate of the Google Play version.
Store checks
- Developer signature verified Aug 6, 2020
- Validated against Google Play Aug 8, 2025
- Antivirus scan passed Jan 6, 2021
- Uploaded by “split-store” Gold tier · 24,358 followers · uploading since 2019
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 Digital Slide Rule on Android 2.3+
You'll need about 88.3 MB of free space.
- Download the APK — tap Download APK above (44.2 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 air-digitalsliderule20160505a-4006006-52320905-14ee5e9f4ef33dbfeb01dc8e19d6bbe4.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 14ee5e9f4ef33dbfeb01dc8e19d6bbe4. 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 Digital Slide Rule — 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 2.3+). Download it again, or pick an older version.
- “App not compatible with your device” — this build contains native code for ARM 32-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.