Ultimate Stopwatch & Timer v8.0.0
APK · 1.3 MB · version code 53 · Android 2.3+ · uploaded Mar 21, 2016
- Signature matches the Google Play version Details
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File information
- Version
- v8.0.0 (53)
- Uploaded
- Mar 21, 2016
- Size
- 1.3 MB
- Requires
- Android 2.3+ (API 9)
- CPU support
- Any (no native code)
- Screen
- Small screens and larger
- MD5
- 8dbcd66ac5b305a8d21c045d1bd678bd
- Signing certificate (SHA-1)
- 69:1F:C3:49:AB:2F:C8:90:34:7D:F7:E1:94:87:AC:F5:29:1D:40:D8
- Signed by
- CN=Richard Hyndman, OU=dev, O=GeekYouUp, L=London, ST=London, C=UK
- File name
- com-geekyouup-android-ustopwatch-53-18287928-8dbcd66ac5b305a8d21c045d1bd678bd.apk
- Package
- com.geekyouup.android.ustopwatch
- Downloads (all versions)
- 1M+
- Age rating
- PEGI 3 · Everyone
What's new in v8.0.0
6.0.5
- Haptic feedback (vibrations) for Start / Stop added in Settings
- New app icon
- Bugfixes
6.0.4
- Improved redraw cycle
- Bug fix for clock tick sounds duplicating
6.0.3
- Watch is now Hardware Accelerated for much improved performance on Android 3+
- Animations when resetting watch and setting countdown time
6.0.0 - Full re-write based on the designs by Marie Schweiz
Permissions (2)
This version requests 2 permissions, none of them sensitive.
- Control vibration android.permission.VIBRATE
- Prevent the device from sleeping android.permission.WAKE_LOCK
Security & authenticity
Security rating: Trusted
Signing certificate
- Signature matches the Google Play version Checked by the source store on Nov 5, 2025.
- Certificate issued to “GeekYouUp” This is the certificate of the Google Play version.
Store checks
- Developer signature not checked yet Nov 5, 2025
- Validated against Google Play Nov 5, 2025
- Antivirus scan passed May 31, 2020
- Uploaded by “apps” Platinum tier · 3,423,810 followers · uploading since 2010
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 Ultimate Stopwatch & Timer on Android 2.3+
You'll need about 2.7 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 com-geekyouup-android-ustopwatch-53-18287928-8dbcd66ac5b305a8d21c045d1bd678bd.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 8dbcd66ac5b305a8d21c045d1bd678bd. 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 Ultimate Stopwatch & Timer — 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.
- Blocked by Play Protect — Play Protect checks apps from outside the Play Store. Only continue if you trust the source.