Referee Whistle v1.0
APK · 2.4 MB · version code 1 · Android 4.0.3+ · uploaded Sep 4, 2025
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File information
- Version
- v1.0 (1)
- Uploaded
- Sep 4, 2025
- Size
- 2.4 MB
- Requires
- Android 4.0.3+ (API 15)
- CPU support
- Any (no native code)
- Screen
- Small screens and larger
- MD5
- 1de5f7ebc5b8e4c4184c842e758f710a
- Signing certificate (SHA-1)
- DB:2B:57:9E:16:F2:29:80:4A:B1:B5:B5:AA:68:B6:EF:B1:50:1A:9A
- Signed by
- CN=Referee Whistle, OU=Persim, O=Persim, L=Vl, ST=Czech Republic, C=CZ
- File name
- com-persim-refereewhistle-refereewhistle-1-71597592-1de5f7ebc5b8e4c4184c842e758f710a.apk
- Package
- com.persim.refereewhistle.refereewhistle
- Downloads (all versions)
- 109
- Age rating
- PEGI 3 · Everyone
What's new in v1.0
Simple and clean
Easy to use
Easy Interface
Permissions (2)
This version requests 2 permissions, none of them sensitive.
- Full network access android.permission.INTERNET
- View network connections android.permission.ACCESS_NETWORK_STATE
Security & authenticity
Security rating: Trusted
Signing certificate
- Certificate issued to “Persim” The developer's name — though anyone can put any name in a certificate.
Store checks
- Developer signature verified Sep 4, 2025
- Antivirus scan passed Nov 3, 2020
- Uploaded by “catappult” Platinum tier · 1,377 followers · uploading since 2018
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 Referee Whistle on Android 4.0.3+
You'll need about 4.9 MB of free space.
- Download the APK — tap Download APK above (2.4 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-persim-refereewhistle-refereewhistle-1-71597592-1de5f7ebc5b8e4c4184c842e758f710a.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 1de5f7ebc5b8e4c4184c842e758f710a. 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 Referee Whistle — 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 4.0.3+). 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.