Last updated: 18 July 2026

Pistonly ("the app", "we", "us") is an OBD‑II diagnostic assistant for cars and motorcycles. This policy explains what data the app handles and why. The short version: the app has no account, stores your data on your device, and never sends your VIN to our servers.

Developer / data controller: Aliaksei Yelin. Contact: [email protected].

1. No account

Pistonly has no sign‑up and no login. We do not ask for your name, email, phone number or any social profile, and we do not create a user account for you.

2. Data stored on your device only

Everything you enter stays on your device (and in your own iCloud device backup, if you have one enabled). This includes:

• your garage (vehicles, VIN, make/model/generation);
• your service book (work records, mileage, parts, notes);
• your fault‑code log;
• interview answers and checklist progress;
• app settings.

We have no server copy of this data. Deleting the app removes it. Individual records can also be deleted inside the app.

3. AI diagnosis

When you ask for an AI diagnosis, the app sends only the following, over an encrypted HTTPS connection, to our diagnostic service (a Firebase Cloud Function that forwards the request to our AI provider, Perplexity AI):

• the fault codes involved;
• the relevant service‑history text and interview answers;
• basic vehicle context (make, model, generation, engine).

Your VIN is not included — it is removed before the request is sent. The request is processed to generate your result and is not used to build a profile of you and is not linked to your identity (there is no identity to link it to).

To provide the free monthly allowance (3 AI diagnoses per month), the app sends a random, anonymous installation identifier generated on your device. It is not your Apple ID, name or email and cannot identify you personally.