Alta HR vs Versa for sleep tracking

[letmesleep]

Hi,

I am buying a fitbit solely for its sleep tracking functionality.

I was going to get the Alta HR as it seems to be the most compact one, but I was wondering whether Versa (being the new model) has a better hardware for sleep tracking which produces more accurate results?

[Fisheattoes]

I have the Versa. I love it. It seems to be tracking my sleep accurately. It even has nailed down when i fall asleep and when I wake up. 

[WavyDavey]

The Versa and Alta HR use Fitbit's Pure Pulse technology for heart rate monitoring (which is the basis of the new sleep tracking). I have both models and the sleep tracking appears identical.

[Dominique]

This is how their back compare:

Although they use the same technology, as pointed out by @WavyDavey, the elements used to measure HR are not layed out in the same way.  

[Dominique]

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@letmesleep wrote:

I am buying a fitbit solely for its sleep tracking functionality.

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Not what you’re asking, but I think you’d be missing out a lot if you were using your Fitbit only for tracking sleep.