Semafor works offline, so no personal information is sent to any server or ever leaves your device.
We use Google's ML Kit APIs for the image processing purposes. Processing of the input data (e.g. images, video, text) fully happens on-device, and ML Kit does not send that data to Google servers. The ML Kit APIs may contact Google servers from time to time in order to receive things like bug fixes, updated models and hardware accelerator compatibility information. The ML Kit APIs also send metrics about the performance and utilization of the APIs in the app to Google.