Linesider

Privacy Policy

Last updated 28 August 2026.

Linesider is a transport-spotting app. This policy explains what we collect, how we use it, and the choices you have.

What we collect

Account: your email address and an encrypted password (or your Apple ID if you sign in with Apple), plus optional profile details (display name, bio, home region, avatar).
Your spots: the photos you upload, the vehicle/operator/class details, and (when you choose to attach it) the location and time of a sighting.
Diagnostics: limited technical logs of errors to help us fix problems.

To run the app: store your catalogue, fleet lists, spots and journeys, and show them back to you.
To identify a vehicle from your photo, your image is sent to an AI provider for that single request, and only when you ask for it. Identification never runs on its own. Which provider depends on your plan: Google (Gemini) on the free tier, Anthropic (Claude) on Pro.
To let you optionally share fleet lists with the community (only lists you explicitly submit).
We do not sell your data or use it for advertising.

Supabase: database, authentication and storage.
Cloudflare R2: hosting of your uploaded photos.
Anthropic (Claude): AI vehicle identification of the photo you submit, on the Pro tier.
Google (Gemini): AI vehicle identification of the photo you submit, on the free tier, and for Pro accounts past their monthly fair-use allowance.
Vercel: hosting of the web app and APIs.
Resend: sending account and billing email (sign-in links, receipts, service notices).
Stripe: payment processing and subscription billing for Linesider Pro. Through Stripe Managed Payments they are the merchant of record for any purchase, and handle your payment details and the sales tax or VAT on it; we never see your card.
Apple: if you use Sign in with Apple, TestFlight or the App Store.
Google Play: if you install Linesider on Android through the Play Store.
Google (ARCore Geospatial): on Android phones with Google Play Services for AR, the spotting camera can use Google’s Geospatial service to work out precisely which way the phone is pointing. While that camera is open, visual features derived from the camera frames (not the photographs you take) and your location are sent to Google for that purpose only. It is never used when the camera is closed, and phones without Play Services for AR use the compass instead.

Delete your account at any time from Settings → Delete account; this permanently removes your account and your data.
Location on a spot is optional. You control whether it’s attached.
For any request about your data, contact us below.

Questions or requests: tony@d9cd.net.