Hi @Buffo!
Beestat uses OAuth to connect to your ecobee account. This is a standard and secure method of sharing limited access to an account with a third party. When you authorize, you should see beestat in the “My Apps” section of the ecobee website:
If it’s not showing up there then I don’t really know what to tell you except that it would be an issue on ecobee’s end. I can understand the desire to have confidence in this list so that you know exactly who has access. To my knowledge, every third party app you use should be showing up here.
I’ll reach out to ecobee and see if they have any comments.