AFAIK, Alexa Voice Service and Alexa Skills Kit are only available for device, which is our customized hardware. iOS/Android app, (referred as companion app, created by Amazon), is mainly for settings, such as:
- Authorize hardware
- Enable/disable skills
- Display graphical representation of a result (Displaying Cards in the Alexa App section)
- ...
Has Amazon released Alexa API on iOS/Android, instead of device currently?
Thanks