While I don't believe any of the Fitbits as a stand alone device are
accessible, the iOS app is completely accessible. The app is where you'd go
to check your data anyway. I have a Fitbit flex, but I really only use it
for the vibrating alarm feature. I use it as my silent alarm instead of my
iPhone in the morning so as to not wake up my wife since I’m the early bird
where she on the otherhand hates mornings with the intencity of a thousand
burning suns.
I couldnt' speak as the the accessibility of the Android app or if there's a
Windows version or other means to synchronize with the PC

Cristóbal