Chatsie is built on Android 14 which accommodates for the Hard of Hearing and Deaf Communnity in the Accessibility section. The key visual indicator is via Flash Notification, as well as supporting the use of Apps associated with Hearing Aids which can be downloaded via the Google Play Store.
On Main Menu
> Scroll to the bottom
> Tap Other Options
> Tap Advanced
> Scroll to the bottom
> Tap Android Settings
> Tap Continue
> Tap Yes
> Tap Accessibility
> Tap Scroll down to and Tap Flash notifications
> Tap "Screen Flash" on
While the Chatsie supports inductive loops, the best experience will always depend on the specific hearing aid model and its T-coil's sensitivity, as well as the quality of the inductive loop system itself.