Group size
Check whether the solution is designed for a shared group room or only a two-person call.
Hardware flexibility
A useful app should work with the Android audio route available on each phone rather than forcing every rider into one headset brand.
Network recovery
Motorcycle rides cross changing mobile coverage. Automatic reconnection after short drops or network transitions matters.
Privacy and location
If the app offers nearby ride discovery, look for approximate public location instead of exact public GPS coordinates. Precise meeting points should stay within the admitted group.
VocAll
VocAll is free, does not require a VocAll account and combines group WebRTC audio, private rooms, nearby public rides, optional GPS, alerts and local ride summaries on Android.
VocAll: free Android motorcycle group intercom with no VocAll account required.