The $0.99 app provides a daily sync of eleven different pieces of data from the Fitbit into the Health app. The points of data accrued include: active calories, resting calories, dietary calories, body fat percentage, body mass index, flights of stairs climbed, sleep analysis, walking and running distances, weight, and steps taken.
To get the app working the first sync needs to be done manually inside of the app, but after that it will automatically sync data from the Fitbit device into the Health app every twenty-four hours. The app's release notes also mention that because there is no way to disable step counting by the iPhone itself, the "steps taken" figure is likely to be doubled as both the iPhone and Fitbit track the statistic.
The release of Sync Solver comes after rumors that Apple would cease offering Fitbit in its retail stores, and the company subsequently doing just that. Apple has not shared the reason for its discontinuation of Fitbit's products, but a combination of Apple's impending launch of Apple Watch and Fitbit's announcement that it has no plans to support HealthKit likely contributed to the move.
Sync Solver can be downloaded from the App Store for $0.99. [Direct Link]