Is the technology used for sleep tracking the same in Charge 2 compared to Alta HR?

[dqcrob]

Is the technology used for sleep tracking the same in Charge 2 compared to Alta HR?  Some sources indicate that the the Alta HR is more up-to-date regarding  sleep-tracking than the Charge 2? Is this so? 

[WavyDavey]

It's the same as far as I know.

Can you cite your sources that say otherwise?

[dqcrob]

Several magazines suggest that the Alta HR is the best best choice for
sleeptracking while Charge 2 was already available in shops. This is what
caused, I guess, me and other people to start doubting maybe there is a
difference in sensors and software. It is not that there is written there
IS a difference. My apologies if I was unclear about this

[WavyDavey · Accepted solution]

No worries. Sleep stages from Fitbit were often associated with the release of the Alta HR, which I think caused some to mistakenly believe the Alta HR had more updated technology.

Basically, whichever tracker you can wear comfortably so that heart rate monitoring is continuous without dropouts, is going to give you the best results.