I liked this until...
It had the opposite effect for me. I work for a funeral home, and Im on call at night. Without alerting me, this app enabled do not disturb mode which blocked the calls from our answering service. Luckily i just happened to wake up and see the missed messages. I will be uninstalling because of this. Absolutely terrible that it would change my settings without telling me.
metallicsonatas about
Calm, v2.6.3