An appointment companion could help users prepare, find practical instructions and record questions they want to ask. Its design should follow the needs of the intended users, including screen-reader access, readable layouts and alternatives to complex gestures.
Appointment details and private notes need clear storage and sharing controls. Reminders should be configurable and avoid revealing sensitive information on a locked screen. Users may want to share selected notes with a trusted person without giving full account access.
Prototype a simple preparation journey and test it with people using relevant accessibility tools. Include changed appointments and an unavailable connection. The app should support the person's own decisions and communication, without interpreting symptoms or implying that recording an appointment means a provider has confirmed it.
Related reading: Mobile App Accessibility: Make Your App Easier to Use.