SkyBell HD

I’m thinking of trying this out. I understand it requires the video package but can it be used without it too and use the free service from skybell?

I want to try it out first and use the free service but then if I get more cameras
Later then I want to get the video package and switch the doorbell over to alarm.com

I believe so, though we cannot guarantee all functions as the ADC Skybell HD is only supported through Alarm.com