Needs improvement
The app works good with the watch, however it has a very poor interface. For example you can go back to the detailed page of a previous night, you only have acesso to the total sleep time. There is no quality ratings for your sleep neither the parcial time spent in restless and deep sleep. I think the app was developed by someone who doesn't uses it. Don't buy this if you want a detailed sleep tracker, this one is poor Follow up: After the last update the app is much better, indeed a big improvement