Diag Drive Privacy Policy

Last updated: 8 November 2026

This policy explains what Diag Drive (“the app”, “we”) collects, why, and the choices you have. Contact us at privacy@motorlane.uk.

What stays on your phone

If you don't sign in, your garage (vehicles, VIN, service history, reminders), chat history, OBD scanner readings and recordings are stored only on your device. We don't upload them, except for the parts you include in a question to the AI assistant (see below).

Backups when you sign in

If you sign in, we back up your garage (vehicles, VIN, number plate, service history, reminders and parts log) and your AI chat history, including small photo thumbnails, to our servers so you can restore them on another device. Audio recordings are never stored. Live OBD readings and drive recordings stay on your phone. Backups are linked to your account and kept until you delete them or your account.

What we collect

• Account details (optional): if you create an account, we store your email address and a securely hashed password, or the identifier Apple provides when you use Sign in with Apple. If you choose Apple’s “Hide My Email”, we only receive a relay address.
• Device identifier: a random ID created by the app so we can keep track of your AI credits. It is not your advertising ID.
• AI requests: the text, photos and audio recordings you send to the assistant, together with any vehicle details and live data you include. We pass them to Google’s Gemini API to generate an answer. We don’t keep them on our servers after the answer is returned, other than short-lived technical logs. If you’re signed in, the conversation itself is saved in your backup (see above).
• Purchases: when you subscribe or buy credits, the app sends us the store’s purchase record (Apple’s signed transaction on iPhone, the Google Play purchase token on Android) and we check it with Apple or Google so we can apply your plan. We never see your payment details.
• Usage counts: how many AI credits you have used and earned.

Advertising

Free users can watch optional rewarded ads from Unity Ads. Unity may collect device and usage data to show and measure ads. Ads are non-personalised unless you turn on personalised ads in Settings. See Unity’s privacy policy.

Third parties

• Google (Gemini API for AI answers)
• Unity (Unity Ads for optional rewarded ads)
• Apple (Sign in with Apple, App Store purchases)
• Google (Google Play purchases on Android)
• NHTSA (VIN decoding and US recall checks: only the VIN, or the make, model and year, is sent)
• DVSA and DVLA (UK) and RDW (Netherlands) for number plate lookups: only the number plate is sent

We don’t sell your personal data and we don’t use it to track you across other companies’ apps.

Keeping and deleting your data

Account data is kept until you delete your account. You can delete it at any time in the app under Settings › Account › Delete account, which removes your account, your garage and chat backups, credits and linked purchase records from our servers. Backup copies of our database used for disaster recovery are deleted within 14 days. Deleting the app removes the data stored on your phone.

Your rights

Under UK GDPR you can ask for a copy of your data, ask us to correct or delete it, or complain to the Information Commissioner’s Office (ico.org.uk). Email us at the address above.

Children

Diag Drive is not aimed at children under 13.

Changes

If we change this policy, we’ll update the date at the top of this page.