Privacy Policy
Last updated: November 7, 2026
Coretrix Technology Limited ("we", "us") made the SAT R/W Sprint app ("the app"). This policy describes what the app does with your information. Your answers, your journal and your settings stay on your device. The app downloads its question bank from our server and sends an anonymous heartbeat so we can keep that service running.
1. What the app collects
There is no account, no sign-up, and no name or email address attached to the app. What the app sends to our server is this, and only this:
- An anonymous installation ID. A random value generated on first launch and stored on your device. It is not linked to your name, your email, or an Apple or Google account, and it is lost if you uninstall the app.
- App and device facts: the app version and build, the platform (iOS), the operating-system version, and the interface language you chose.
- A heartbeat: when the app was first and last seen, and how many heartbeats it has sent.
- Connection data: the IP address your request arrives from, and the country code derived from it. Our server observes these; the app does not send them.
The app also downloads its question bank from our server. That request carries no information about you beyond what is needed to deliver the file.
2. What the app does NOT collect
No answers, predictions, reflections or journal entries. No record of which questions you read or answered, and no score. No precise location, advertising identifier (IDFA/IDFV), contacts, photos, microphone or camera data. No third-party analytics or advertising SDK.
3. What stays on your device
- The options you chose, whether they were right, and the prediction you committed before answering.
- The reflection you wrote about a question, kept in your own words.
- Your interface language choice and the tester-access claim, if you made one.
- Your downloaded copy of the question bank, so the app works offline.
These live in the app's own storage. We cannot read them. The downloaded question bank contains public questions only — never anything you wrote.
4. Why we collect it, and who processes it
To deliver and update the question bank, to keep the service working, and to understand which platforms and countries the app is used from. That is all.
We do not sell it, share it for advertising, or use it to track you across other apps or websites. There is no third-party analytics service in the app.
The data is stored on our own server (Alibaba Cloud ECS) and passes through Cloudflare, which provides the network in front of it. All traffic uses HTTPS. Our web server's access logs contain IP addresses; the logs are kept only for as long as they are needed to operate and secure the service.
5. How long we keep it
A heartbeat record is deleted once that installation has not been seen for 180 days. Uninstalling the app stops future heartbeats, but records already sent stay until that 180-day window ends. You can ask us to delete them sooner — see section 8.
6. Permissions the app asks for
None. The app does not request access to your camera, microphone, photo library, contacts, location, Bluetooth, or health data, and it does not use the advertising identifier.
7. Children
The app is suitable for all ages. It asks for no name, no email and no account, so there is no profile a child could be identified through. The heartbeat carries only the anonymous installation ID and the app/device facts described above.
8. Your choices
Delete what is on the device: uninstall the app. Your answers, journal, settings and downloaded question bank live inside the app's container, so removing the app removes them.
Delete the heartbeat record: write to [email protected] with the approximate date and country. Because the installation ID is anonymous, we need something to match the record on.
Ask a question about this policy: the same address.
9. Changes to this policy
If this policy changes, the date at the top of this page changes with it. If a future version of the app begins sending anything more than what is described here, this page will say so before that version is released.
10. Contact
Coretrix Technology Limited · Macau
[email protected]