What the phone app knows about you.
This page covers the GT7 Datalogger app for iPhone and Android. It has no accounts, no ads, no analytics and no trackers. What it records stays on your phone and your own network, unless you connect it to a sync service and switch a data type on.
Last updated 23 October 2026.
One person, as a hobby.
Hi, I’m JB (github.com/jbhoorasingh). I build the app on my own, and it’s free. It isn’t affiliated with Polyphony Digital or Sony.
Your laps and your settings, kept locally.
- Sessions and laps — ones the phone recorded from your PlayStation, and ones you copied from your datalogger: the car, lap times and the telemetry behind them.
- Settings — which datalogger or PlayStation you last connected to, your units, your dash layout and Race Engineer choices.
- A random id, made the first time the app runs. It isn’t tied to you, your phone’s hardware or any advertising id.
- A sync token, if you paste in a connection string. It is kept in the iPhone Keychain or the Android Keystore, not in ordinary storage.
None of this leaves the phone on its own. More → Storage on this phone shows how much space it takes. Deleting the app deletes all of it.
Your PlayStation and your datalogger.
- Your PlayStation. The app sends it the small “heartbeat” Gran Turismo 7 needs before it streams telemetry, and receives that telemetry. To find the console it broadcasts on your Wi-Fi network.
- Your datalogger. The app finds it on your network, or from the QR code in its settings. When it connects, it tells the datalogger the app’s version and the random id above, so the datalogger’s log can tell your phone from another. It then streams and copies your sessions.
Both conversations stay on your own network. They go nowhere else. What the datalogger itself keeps and sends is on its own privacy page.
What the app asks for, and why.
| Permission | What it’s for |
|---|---|
| Local network | Finding and talking to your PlayStation and your datalogger. |
| Camera | Scanning the datalogger’s pairing QR code. Nothing is photographed, saved or sent. |
| Wi-Fi (Android) | Checking you’re on Wi-Fi, and receiving the console’s and datalogger’s replies to broadcasts. |
The app does not ask for your location, contacts, photos, microphone or advertising id.
The Race Engineer speaks with your phone’s own text-to-speech voice. On iPhone that happens on the device. On Android it uses whichever speech engine you’ve chosen in Android’s settings, which may be Google’s.
Off until you turn it on.
The only time the app sends anything beyond your network is when you sync. That needs two things: a connection string pasted into More → Sync, and at least one data type switched on. All three types are off to start with.
- Track surveys — the borders of circuits this phone recorded, for the shared track map. Nothing about your laps.
- Sessions — your sessions and laps, as a private cloud copy.
- Live — where your car is, a few times a second, while you’re on track.
With each upload the app sends your token, its random installation id and its version. The data goes to the server named in your connection string. For the hosted service at sync.gt7-datalogger.com, what is kept, who can see it, how long it’s kept and how to delete it are all on the sync service’s privacy page. A server somebody else hosts is theirs to look after.
Switching a type off stops it. Disconnect, in More → Sync, deletes the token from your phone.
The app stores, and Google’s scanner on Android.
- Apple and Google deliver the app. If you’ve agreed to share diagnostics with app developers in your phone’s settings, they pass me crash reports and usage figures that don’t identify you. Their own privacy policies cover what they collect.
- TestFlight. If you test a beta through TestFlight, Apple shows me the name and email address you were invited with, if you were invited by email. Apple also passes on any feedback, screenshots and crash reports you choose to send.
- Google ML Kit reads the QR code on Android, on the phone. Google says ML Kit may send it information about how the scanner itself performs. It never sends the camera image.
The app’s typeface is built in, so no font service is contacted.
A question, or a request.
Everything the app holds is on your phone, where you can delete it. For what a sync service holds, see its privacy page. For anything else, email gt7-datalogger-sync-admins@googlegroups.com.
The app is not meant for children under 13.
If this page changes, the date at the top changes with it.