Basic live viewing and streaming is free.
Camio Plus, which adds 30-day video history, daily summaries, search and alerts is $9.90/camera/month.
https://www.camio.com/price has the latest info.
Everyone initially gets 7 days of Camio Plus for free.
When you invite another person to use Camio, you also get 30 days of Camio Plus for free.