How Parages alerts you without knowing anything about you

It is the question we get asked most often: if Parages tells me when I am near a friend, then surely it knows where I am, right? The short answer is no. And that "no" is exactly the heart of what we built, so it deserves a proper explanation.

Most location apps work the same way: your phone sends your position to a server, continuously, and the server decides what to do with it. Show you on a map, alert a group, work out distances. The trouble is that the moment your location leaves your phone, you lose control of it for good.

Parages flips that pattern completely on its head. The calculation happens on your device, not on our servers. You save the rough address of your friends, by neighbourhood. Your phone keeps that little list locally, and it, and it alone, compares your position to the list from time to time. If it detects that you are getting close to one of them, it fires a notification, directly, without asking any server for permission.

This technique has a name in the trade, local geofencing, and it is the same building block that lets your phone show you a reminder when you reach the supermarket. The difference is that we pushed it all the way: at no point is your location passed along anywhere, because at no point does it need to be.

The consequence is radical. We store no map of your movements, quite simply because we never receive one. Even if we wanted to one day, even if a court asked us for it, we could not reconstruct your days. We do not hold the data. That is an architectural guarantee, not a marketing promise we could quietly revise later.

Your friends notebook, for its part, is encrypted and stays on your device. Your friends do not need to install Parages, and they appear on no map. You are the only person in the world who knows who is on your list. Proximity is worked out for you, on your phone, and forgotten the instant after.

This approach has a name and references behind it. It is what GDPR calls data minimisation, in its article 5: collect only what is strictly necessary. It is also the privacy-by-design formalised by the researcher Ann Cavoukian back in 2009, the idea that privacy should be the default setting of a system, not a checkbox bolted on after the fact.

This architecture has one last advantage, quiet but real. Since nothing passes through our servers, your phone does not need to wake the GPS constantly or stay tethered to a permanent connection. In practice, that means less battery drained and no dependence on a server that could go down, change its policy, or get bought out. Privacy here is not a trade-off that costs you comfort: it is the very same technical decision that protects you and spares your device.

We believe privacy should never be an option you switch on in a menu, hoping you set it up correctly. It should be the default behaviour, the kind you cannot even turn off because the app was conceived this way from the very first line of code. At Parages, that is exactly the case, and it is non-negotiable.