This app does exactly what the Manuèl states: syncs the Apple Health app steps to FitBit. You can/will lose steps. The developer has made it extremely clear in the manual (so please read it). Ive lost 1k - 5k of steps. Thats when Ive paid attention: butwhacchagonnado? FitBit doesnt want to lose its business so dont expect to compete at the same level. I say that, but FitBit should fix that so we can enjoy the platform. If only they understood that we love to compete through FitBits app. Oh wells (live and learn).
Nonetheless: I recommend this app!
pRin533 about Sync Solver - Health to Fitbit