Privacy
Clew keeps everything on your phone first. This page says what, if anything, leaves it, and why.
Signed out
Nothing you make leaves the phone. Your boat, trips, notes, log, Locker, settings and home stay on it. To show tides, trains and the forecast, the app asks Clew's server and the services behind it for public data: a position for the tides, where you set off from and the boat's nearest station for the trains. The server answers and keeps nothing about who asked. The one thing it keeps is the tide predictions it pays for, and only for marinas in Clew's own list: public predictions for a public place.
Signed in
Signing in (with Apple, Google or an emailed link) is optional, and it's what turns these on:
- Backup. Your trips, notes, log and Locker are copied to Clew's server, just for you, so a new phone gets them back.
- Sharing a boat. Crew you invite see the boat and where she's kept. Never your logbook or your home. Inviting someone by email sends them one email and keeps their name and address as their account, so that signing in with that address brings the boat; nothing else is sent to them.
- Weather alerts. Your saved days, what you're happy sailing in and the phone's notification address, so the server can check the forecast each morning and tell you when it changes.
The server keeps the account's sign-in identifier and, if you gave one, your name. An emailed sign-in link, or the link in an invite email, is stored only as a scrambled hash, used once, and expires.
Location
Your location is used on the phone: to switch Home to "aboard" at the marina and, if you turn on arrival alerts, for iOS to notice when you reach it. It isn't sent anywhere, apart from where you set off from when the app asks TfL for trains.
No tracking
No adverts, no analytics, no selling of anything. The app doesn't follow you around the web.
Deleting it
Signing out stops anything more being sent. To delete your account and everything kept for it, go to Skipper › Account › Delete account in the app: the backup, weather alerts and your place on shared boats go straight away (a boat you share passes to your crew), and what's on your phone stays on it. You can also ask at j+clew@wallis.dev.
The services behind it
Tides from WorldTides, weather from Open-Meteo, journeys from the Transport for London Journey Planner, places from postcodes.io and Photon (OpenStreetMap). Accounts and backups are kept with Turso, sign-in and invite emails go through Resend, and the server runs on Vercel.