Hello, yes the app is free. At the moment I have a continuous history since August 2019, i.e. 6 and a half years. For me, this is a considerable advantage. Best regards. Yannick
I can also add that you get the maximum and minimum values for the day, but you still have access to all the values if you zoom in 10 minutes at a time. The free application is called Home Coach. Best regards. Yannick