I do not handle personal information in this application. All data (app preferences etc.) is stored on your device only, and can be erased by clearing the app’s data or uninstalling it.
QBox is an open source Android app. The source code is available on GitHub under the BSD 3-Clause license; the app is also available on Google Play.
If you find any security vulnerability that has been inadvertently caused by me, or have any question regarding how the app protects your privacy, please send me an email.