Self-Defence Sound
This app can play sound to protect you sometimes
youyou_dev · net.youyoudev.alarm
- Signature matches the Google Play version Details
At a glance
- Latest version
- v2.6 (26)
- Updated
- Sep 27, 2026 (11 days ago)
- APK size
- 4.8 MB
- Requires
- Android 4.4+ (API 19)
- CPU support
- Any (no native code)
- Category
- Tools (app)
- Listed since
- Jun 9, 2023 (at least)
- Permissions
- 5
- Developer contact
- [email protected]
About this APK
Self-Defence Sound is an app by youyou_dev in the Tools category, listed since at least June 2023. It has no native code, so it runs on any Android processor.
It asks for 5 permissions, none of them sensitive. It asks for the same permissions as version 2.5. The app can read the advertising ID that ad and analytics services use.
Description
From the listing uploaded by “appupdater”.
Version history
3 versions are listed, going back to v2.3.
Security & authenticity
Signing certificate
- Signature matches the Google Play version Checked by the source store on Sep 27, 2026.
- Certificate issued to “None” This is the certificate of the Google Play version.
- Same certificate as the 2 other versions checked
Store checks and file details
- Developer signature verified Sep 27, 2026
- Validated against Google Play Sep 27, 2026
- Signed byCN=Bob, OU=NONE, O=None, L=Beijing, ST=Beijing, C=cn
- Signing certificate (SHA-1)D6:C4:2A:7D:0B:0C:0E:0A:07:3B:26:E9:28:90:F2:D9:17:23:0E:A7
- File MD5577a5ba373236fcde278b5b7a306fdea
- Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020
Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.
Permissions (5)
Self-Defence Sound requests 5 permissions, none of them sensitive.
- Advertising ID com.google.android.gms.permission.AD_ID
- Full network access android.permission.INTERNET
- Prevent the device from sleeping android.permission.WAKE_LOCK
- Run foreground services android.permission.FOREGROUND_SERVICE
- View network connections android.permission.ACCESS_NETWORK_STATE
Required hardware & features
- Basic touch input android.hardware.faketouch
- Portrait screen android.hardware.screen.portrait
Self-Defence Sound APK: questions and answers
Can I install this APK over the version I already have?
Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.
Is the Self-Defence Sound APK safe?
No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the 2 other versions checked. After downloading, check that the file's MD5 is 577a5ba373236fcde278b5b7a306fdea.
