does a fitbit ANT dongle work with Zwift on a mac/
As far as we know FitBit is not using Ant+ dongles but Bluetooth but with different modulation - using different bluetooth protocol. Simply means it will not work with Zwift.
You can always get Zwift approved Ant+ dongle and some other goodies from our online shop. :) http://zwift.com/gear
Hope it helps,