You can watch solar (and related battery / grid / load data) from a mobile browser or a dedicated app, as long as your inverter vendor exposes data to the account you use.
For Fox ESS on Fox Cloud, use Check My Solar in the browser or install it on your home screen. On Android, install the PWA from Chrome or Vivaldi - see Using Check My Solar on Android. On iOS, use the App Store app or Safari Add to Home Screen; iOS also supports widgets and Live Activities - see iOS widgets & Live Activities.