AFReplacer

AFReplacer is an Android utility that substitutes watchface data used by the Mi Fit companion application, allowing a custom watchface to be pushed to an Amazfit Bip in place of one of the faces that Mi Fit offers. The application works on the files Mi Fit holds on the phone, so the transfer to the watch is still carried out by Mi Fit's own synchronisation step.

Its purpose is limited to this one substitution task. It is not a watchface editor and does not generate designs; a prepared watchface file is supplied by the user. Because the behaviour is tied to a particular watch model and a particular companion app, it is of no use with other trackers or with firmware and app versions whose file handling differs. Availability is Android-only, matching the platform Mi Fit runs on.

AFReplacer is published by HexEdit, DriffeX and NitroOxid under the GPL-3.0-or-later licence.