Privacy policy
Effective June 11, 2026 · Sundial, by Nate Jones
Sundial is an honest app, and this is an honest policy. The short version: your data exists to power your tan math and your social features. We don't run ads, we don't use third-party trackers, and we never sell your information.
What we collect
- Account — your email address, name, and profile photo, so you can sign in and friends can recognize you.
- Skin profile — your skin type, tan goal, pace, and (if you use the scan) a face photo and its analysis. These personalize every recommendation in the app.
- Sessions — when you tan, for how long, the UV index, and the place name and coordinates of where you tanned, so your history makes sense.
- Selfies — tan-progress photos you choose to add. They are stored in a private bucket that only your account can read. Friends and partners never see them.
- Social — your friend connections and couple pairing. Friends see only your name, photo, streak, and whether you are tanning right now.
- Coach messages — what you ask the AI coach and its replies, kept so your conversation has memory.
- Purchases — whether you have Plus or Lifetime, managed by Apple and RevenueCat. We never see your payment details.
- Push token— a device token so your partner's nudges can reach you. No location or content is in it.
Location
Your location is read on your device to fetch the local UV index and find tan spots near you. Live location is never shared with other users and never used for advertising.
Who processes it
- Supabase — hosts our database, authentication, and photo storage.
- Anthropic — processes coach conversations to generate replies.
- Open-Meteo — receives coordinates (nothing else) to return UV forecasts.
- OpenStreetMap (Overpass) — receives coordinates (nothing else) to find nearby beaches, parks, and pools.
- Apple & RevenueCat — handle payments and subscription status.
Each receives only what it needs to do its job. None of them are advertising companies.
Deleting your data
Sundial has full account deletion built in: Me → Privacy & data → Delete account. It permanently erases your profile, sessions, selfies, coach history, friendships, and pairing. There is no undo and no “we keep it for 90 days.”
Not medical advice
Burn limits, SPF suggestions, vitamin D numbers, and tan estimates are guidance from published heuristics — not a medical device. Know your skin, and ask a doctor if you are unsure about sun exposure.
Children
Sundial is not directed at children under 13, and we do not knowingly collect their data.
Changes and contact
If this policy changes meaningfully, the app will say so. Questions or requests: help@heysundial.com.