Privacy

Effective November 2026 · Margin, the card-vendor app

Margin helps trading-card vendors price cards, track inventory, and run shows. This page explains what data the app touches and why, in plain English.

What we collect

• Your account. When you sign up we store your email address or, if you use Sign in with Apple or Google, the identifier they share with us. Authentication is handled by Supabase, our backend provider.
• Your booth data. The cards, shows, deals, and transactions you enter are synced to our database (hosted by Supabase in the United States) so your account works if you get a new phone. This data belongs to you. Your cards, prices, deals and booth are only ever shown to you, except what you choose to show: your booth code's page, and a show's page in the app when you list your booth at a show. There, collectors see your booth's name, your table, the cards you bring and your prices, never what you paid, and the listing ends with the show.
• Anonymous card totals, unless you switch them off. From the deals already synced, we count how many times each card was bought and sold each day across every booth. A count holds only a card, a day and numbers: never your name, your booth, your prices or what any one booth did. A card's count is used only once five or more booths traded it that day. It helps us see which cards sell most and what vendors are picking up. Switch it off in Settings, under Share anonymous totals, and your deals are left out of every count.
• Your booth's name and picture, if you set them. They are stored with your account, so they follow you to a new phone.
• Your payment methods, if you set them up and are signed in. The names you take payment under (Venmo, Cash App, PayPal, and the email or phone number for Zelle), the code pictures you add, and whether you take cash only. They are stored with your account so they come back on a new phone or after you sign in again, and only you can read them. Signed out, they stay on your phone.
• Feedback you send. When you use Help and feedback, we receive your message and any screenshots you attach, with your account, the app version, the iOS version and your phone model, so we can answer you and find the problem.
• A push token and your phone's time zone, if you turn on notifications or a show's table alerts. The token is what lets us send a notification, and the time zone keeps it out of your night: nothing comes between 9 pm and 8 am your time. Nothing else rides along with them. For a show's tables they are kept with that show, not with your account, until you turn the alert off or the show is over.
• Your phone's random id, if you tell other vendors about a show's tables. A report keeps that id and your connection's address for half a day, so one phone counts once. Your name is never shown, and other vendors see only how many said it.

What we don't do

• No ads, and no ad networks in the app.
• We never sell your data or share it with data brokers.
• No third-party analytics or tracking SDKs. We don't record your taps or the screens you open, and we don't want to.
• No cookies or tracking on this website either.

Where prices and card images come from

Market prices, sales history, live listings and card images are fetched from TCGplayer and eBay through our own server. Your personal data is never sent to them: the app only asks about cards, not about you.

Your location

If you allow it, Margin uses your phone's location only to notice when you arrive at a saved show venue. That check happens on your phone, and your phone's position is not uploaded. The venue you save for a show, with its address and map pin, is part of your booth data and syncs with your account like your other shows.

Near you, in Explore, shows card shows and shops around your phone's position or a city you pick. To find them, Margin sends that place to Apple Maps and to our server, which answers with the shows near it and keeps nothing. A shop's icon is loaded from the shop's own website.

Payments

Margin Pro subscriptions are processed entirely by Apple through your App Store account. We never see your payment details. Your phone checks with Apple whether you are a member or in your free week, and keeps the answer on the phone: your purchases are never sent to our server.

The scanner and your photos

The card scanner recognizes cards on your device. Photos you snap to scan a card stay on your phone; they are not uploaded or synced. The only pictures we receive are your booth picture and your payment code pictures, if you set them while signed in, and screenshots you attach to feedback.

Deleting your data

You can delete your account inside the app (your letter at the top left → Settings → your name → Account → Delete account). That removes your account and synced booth data from our servers. If you'd rather we do it, email us and we will.

Questions

Email support@margin.win. A human reads it.