Hi @michaeldurland,
We’ve looked into this thoroughly over the weekend, testing many different Android devices and emulators with varying builds of Supernotes.
The Supernotes mobile apps are built with some of the latest technologies and frameworks so they run super snappy and fast, providing a native-like experience - especially with new notifications and sheets in the latest 2.1 update. Unfortunately some of these frameworks make use of some of the newer Android APIs and don’t support Android 9 or lower. We’ve updated our downloads page with the new requirements (Android 10+ and iOS 13+).
We’re realise this isn’t great if you want to run Supernotes on Android 9, but this might be a good opportunity to update to a newer version if possible. However, we will continue to support and improve our mobile PWA for older devices 