Privacy

De Tennis App shows you your club's information in a nicer way. To do that it keeps very little of its own, and this page lists all of it.

What we keep, and why

• Your name and your club, and your KNLTB membership number if you have one, so the app keeps working if something changes on the KNLTB's side. Without a membership you use the app as a guest at the club you chose, or at none.
• Your e-mail address, so you can always sign in to your De Tennis App account. Sign-in is by a one-time code sent to this address.
• The photo you choose in the app, if you set one; a guest adds one when signing up. Your club's photo is never copied.
• Who you follow, and the invitations you send: the social side of the app.
• Your notification settings and reminders, and the device token that lets a push notification reach your phone.
• Your playing strength, if you are a KNLTB member, copied from your club's record of you. It is used for one thing: so that when a game at your club is a player short, we only tell the people who play at that level. It is never shown to anyone from our copy.
• Where you asked to be told about tournaments, if you turned on "Tell me when registration opens": the point you chose and what it is called — your club, or a postcode you typed — and how far around it to look. A postcode you type stays on your phone; only the point it resolves to travels.
• If you ask the website for the link: your e-mail address, the club you chose and whether you are a member, for sixty days. We use it to send you the link to the app, and once to remind you if you still have no account after a few days. Then it is gone. It is not an account: you create that in the app.

What we never keep

• Your KNLTB password. It is stored encrypted on your own device only, and sent only to your club's own platform when you sign in.
• Your KNLTB sign-in. When you sign in with your membership, your phone passes the sign-in it got from your club's platform to our server once, so the server can confirm with the KNLTB that the membership is yours. It is not stored.
• A guest's year of birth. It is checked once, when you sign up without a membership, to see that you are 16 or older, and not kept.
• Other members' data. What you see about clubmates comes from your club's platform through your own session, and is not stored by us.
• Contact-form messages. They go straight to our inbox and are written nowhere else.

Where it lives

Your account data is hosted with Supabase; e-mail is sent through Resend; push notifications go through Firebase Cloud Messaging. Each acts on our instructions and none of them uses your data for anything else.

Statistics

The app and this website count which screens and pages are viewed and which features are used, with Google Analytics (Firebase). No name, e-mail address or phone number travels with those counts, and no advertising identifier is read. In the app the numbers hang off a random account id that is dropped at sign-out; on the website this happens only if you agree to it on your first visit, and your choice is kept in your own browser.

When the app crashes

If the app stops unexpectedly it sends a report — what it was doing, the line it stopped on, the phone model and the app version — to Firebase Crashlytics, so the fault can be found and fixed. The report carries the same random account id as the counts above, which is what lets us find your crash when you tell us about one. No name, e-mail address or anything you typed is in it, and a crash before you sign in carries no id at all.

Who sees what

Your name, club and the photo you chose are visible to the other people at your club who use the app — members and guests — as they already are on your club's own platform, and to players from other clubs where you meet them: in a game, or in a club's open tournament. Contact details are never shown to anyone in the app.

Your rights

You can see everything above inside the app. You can delete your account at any time from Settings, which removes all of it; see deleting your account. For anything else, write to us.

Not the KNLTB, not your club

De Tennis App is independent. Your KNLTB membership, your club's bookings, results and ratings are your club's record, held by them; deleting your De Tennis App account changes nothing there.