The Give Sight app pulls data from either Apple Health or Google Fit (depending on if you are an iPhone or Android user). Unfortunately, Apple Health or Google Fit are not allowed permission to take data from the Fitbit app. The Give Sight team has found a way to work around this issue by downloading other free fitness apps that connect with both Fitbit and Apple Health/Google Fit.
Apple users can download one of the following apps to connect to both Fitbit and Apple Health:
MyFitnessPal
Strava
Run Keeper
Lose It!
MapMyRun
Stridekick
SparkPeople