This is an open source Android app developed by @doughsay. The source code is available on GitHub under the MIT license; the app is also available on Google Play.
The app only works with a self-hosted Ambry server, available here: https://github.com/doughsay/ambry
This app does not collect nor share any personal data with me (the developer) nor any 3rd parties. Your email address is used as a username for your account and transmitted to your self hosted server for login purposes only.
If you find any security vulnerability or have any question regarding how the app protectes your privacy, please send me an email at [email protected].