This app shows the last syncing time of your fitbit device and your phone. I developed this app for lost cell phone situations.
The time displayed is the last sync time. It is not a lost time. The synchronization interval is a few minutes for the shortest, but can be tens of minutes for the longest. So it's just a reference value.
・Ver 1.2.0 2021-07-05
* Support for 12-hour format
* Support for "elapsed time"