V-Twin Diagnostics — Last updated: August 11, 2026
V-Twin Diagnostics ("we," "our," or "the App") is a mobile application designed to help motorcycle owners and mechanics diagnose fuel injection, electrical and mechanical issues on fuel-injected American V-Twin motorcycles. We are committed to protecting your privacy and being transparent about how we handle your information.
The free reference tools — DTC code lookup, torque specifications, and service intervals — require no account. An account is required only for account-based features: the Oil Change Tracker, your garage, and diagnostics. When you create an account we collect:
If you choose to sign in using a third-party identity provider (Sign in with Apple, Sign in with Google), the App receives the basic profile information (name and email) that the provider releases to it. No additional information is collected through these sign-in flows.
The App also stores the following data on our secure servers, associated with your account so it stays in sync across your devices and the web version:
Some of what you enter stays only on your device and is never sent to our servers:
When you use the App, we and our analytics and advertising partners also automatically collect certain technical and usage information:
We use the information we collect to:
Your account data, motorcycle profiles, diagnostic results and service schedules are stored in a secure cloud database operated on our behalf, and are encrypted in transit. This is what lets your garage and history follow you between the mobile app and the web version. Service records and notes are not part of this — they stay on your device, so they do not follow you between devices. PDF reports you generate are only shared with others if you explicitly choose to export and send them.
Account credentials are handled by industry-standard authentication services and are protected with encryption in transit and at rest. We use secure authentication methods to protect your account from unauthorized access.
We do not sell your personal information for money, and we do not rent or trade it. We share data only with the limited service providers described below, and only as needed to operate, analyze, and promote the App.
We use Meta (Facebook) advertising tools to measure how well our ads perform. Through these tools, certain app-event and device-identifier information may be shared with Meta. Under some U.S. state privacy laws (such as California's CCPA/CPRA), this kind of advertising activity may be considered a "share" of personal information for cross-context behavioral advertising. On iOS this occurs only if you allow tracking through the App Tracking Transparency prompt, and you can opt out at any time in your device settings. Apart from this, your diagnostic data and motorcycle information remain private to you unless you explicitly choose to export and share reports.
The App offers optional biometric authentication (Face ID or fingerprint) for convenient login. Biometric data is processed entirely by your device's operating system and is never accessed, stored, or transmitted by the App. We only receive a success or failure result from the device's biometric system.
We rely on a small set of trusted third-party service providers to operate, analyze, and promote the App. Each receives only the data needed for its function:
These providers process data under their own privacy and security commitments and only for the purposes described here. If our use of third-party services changes, this privacy policy will be updated accordingly.
The App is not intended for use by children under the age of 13. We do not knowingly collect personal information from children under 13. If you believe a child has provided us with personal information, please contact us so we can take appropriate action.
You have the right to:
While your account is active, your account information, motorcycle profiles, diagnostic results, and service schedules are retained so the App can function. Service records and notes are held on your device rather than by us, so they are governed by your device, not by this retention policy — removing the App removes them.
When you close your account (or retire a motorcycle from your garage), we retain a minimal record — your account identifiers (such as name, email, and phone number), the diagnostic results generated for your motorcycles, and the service schedules associated with them — for three (3) years. We keep this limited record for legitimate safety, liability, and recordkeeping purposes: the App provides diagnostic reference information for motorcycles, and we maintain an accurate history of what information was presented. After the three-year period, the record is permanently deleted. A diagnostic result is recorded as it was generated and is not altered afterwards; any notes you choose to add to one remain yours to edit.
We may update this Privacy Policy from time to time. Any changes will be reflected on this page with an updated "Last updated" date. We encourage you to review this policy periodically for any changes. Continued use of the App after changes are posted constitutes acceptance of the revised policy.
If you have questions or concerns about this Privacy Policy or our data practices, please contact us at:
Email: support@vtwindiagnostics.com