I have asked similar question in another thread and got following abswer from the team:
So apparently it could work with Android 6, but the team recommends Android 12 or higher.
On older systems it appears important to have the most recent version of Google Chrome, which should ensure that you have a compatible Webview required for Kurviger operation. Also, grant all permissions that Kurviger requests. Sometimes it helps to deinstall and reinstall the app if it keeps crashing. Good luck…