What this gives you
When this is on, contacts saved in PixWork are written out to the phone’s own contact book.
Useful for seeing a caller’s name on an incoming call, or picking someone quickly from a messaging app like WhatsApp. Scan a card once and that person stops being an unknown number.
Only contacts that have a phone number are written out. A contact with no number is skipped.
One way, from PixWork to the phone
This is a one-way write-out from PixWork into the phone’s contact book. Edits or additions made in the phone’s own contacts app do not come back into PixWork.
The setting is labelled "Automatic sync to the OS contact book" in the app, but it behaves as described above — a write-out only, not a two-way sync.
A failed write-out does not undo the save on the device. By design, a failure here does not stop or roll back the save inside the app.
Supported platforms
This feature is available on Android only. On Android, PixWork creates a dedicated account of its own and writes only underneath it, so the entries appear as a group separate from the contacts already on the phone. Switching the setting off stops the write-out. The write-out runs on a best-effort basis each time a contact is saved, edited, or merged after a duplicate check.
OS contact export is not currently available on iOS. On iOS there is no such setting to find; the rest of this page describes the Android behaviour.
Whether the app can be installed from a given store and whether it can write to the OS contact book are two different facts. PixWork appearing on the App Store would not by itself make iOS OS-contact export available.
What happens on deletion
Deleting a contact inside the app also removes it from the OS contact book, if it had been written out there and a phone number is stored.
Setting a row’s Status to Deleted in the sheet marks that contact deleted inside PixWork, so it drops out of the list. It is not removed from the phone’s address book.