If you want to brush your teeth using your Kolibree toothbrush without using the mobile app, just press the button to turn the toothbrush on or off, and use it like a regular electric toothbrush.
However, if you want to retrieve information from a brushing that was done without being connected to the app, the toothbrush automatically saves it and the data will be transferred to the app the next time you connect to it.
Note that data saving and recovery afterwards is only possible if the toothbrush has been set to individual operating mode.