Two of the four models run on-device. This means that none of the data ever leaves your device, and so absolute privacy is assured. The next two run on Apple Silicon chips on the company’s own Private Cloud Compute (PCC) servers. Apple has designed the architecture in such a way that absolutely no data is retained or exposed to either Apple or Google – and this fact is independently verifiable by security researchers. In other words, you don’t have to trust what Apple says: any qualified expert can check for themselves. With the most powerful model, this is running on Google servers. However,