Just because you can, doesn't mean you should note that some watch complications which pull data/refresh often will impact your battery life, e.g. To get Fitbit-type fully automatic tracking I use an app (see below) which just detects by itself when IвЂ™m sleeping and files that as sleep data without needing my intervention at all.

I learned this the hard way on my first night with it, when I turned on automatic sleep tracking but didnвЂ™t set a schedule or toggle it into sleep mode, and woke up to no sleep data. But you need to do one of those two things or it wonвЂ™t track.

Sleep tracking is not automatic like with a Fitbit - Edit for clarity: on the AW you set a sleep schedule to indicate a range of when you intend to sleep/put it in sleep mode manually and it will automatically track when you actually start sleeping within/around that range. It is a little annoying to have to collect apps to get functions which come stock on a Fitbit, but maybe the list of apps (below) will help! Some of the information you may want on your watch face will need a third-party app to provide the complication. The Apple Health app collects your data but it won't be presented to you in the format/with the analysis you're used to in the snazzy Fitbit app, like with heart rate zones. It does start automatically with some workout apps/services (Nike Training Club, Alo Moves, etc.). It would be better to start the workout mode (including by just using Siri) to make sure you capture your whole session. This is true unless you've got it in workout mode (during which it samples about every 5 seconds) by the way.ДЄlthough AW has auto-detect, it's not that great imho and may miss some minutes in the start of your workout. HR sampling is usually every few minutes on the AW, not every few seconds like on the Fitbit, so don't expect the same granularity 24/7. Hope this post helps give any people switching over to an AW from Fitbit, or thinking about it, the information they need to set their expectations and make the transition easier! (It's totally worth it.)

Youtube taking apple watch cardiograph