How NFC business cards actually work (no marketing fluff)

Most NFC business card vendors describe the magic vaguely: "tap the card, your info shows up." That's mostly accurate, but it skips the parts that explain why some cards work better than others and what can go wrong. Here's the actual flow.

The chip on the card

Inside almost every NFC business card is an NTAG-series chip, usually an NTAG213, 215 or 216. It's passive, which means it has no battery: it powers itself from the field your phone gives off when it's close.

The chip stores very little: from 144 bytes (NTAG213) to 888 bytes (NTAG216). That's enough for a web address and not much else, so almost every NFC business card stores exactly one thing: a link to a page on the vendor's server.

What happens when you tap

1. The phone notices the chip and reads the address stored on it.
2. On iPhone, a banner appears with the link; tapping it opens the page. Android phones usually open the page straight away.
3. The vendor's server sends back the card page, and the browser shows it.
4. The visitor taps Save contact, which hands the phone a contact file (a vCard). On iPhone it opens in the Contacts preview; on Android it downloads and opens in the Contacts app.

That's the whole flow. The card is just a link. Everything that makes a digital business card good, from the page design to the saved contact, the stats and the lead capture, happens on the server.

Why this matters for you

A few practical consequences:

The card can outlive your details. Because the chip only holds an address, the page behind it can change any time. You don't need a new card when you change jobs or phone numbers; you update the page. With NoBrandCards, each physical card has its own short code, and you choose in the app which of your cards it opens, so you can even repoint it without reprogramming anything.

The card lives or dies with the vendor's server. If the server is down, the card shows nothing. If the vendor shuts down or starts charging to keep cards working, your card becomes a piece of plastic. That's why it matters that you can export your contacts, and that a card keeps working on a free plan. Both are true on NoBrandCards: CSV and vCard export on every plan, and cards that keep opening your page on the free plan.

Distance matters. Phones need the card within a centimeter or two of their antenna. iPhone antennas are at the top edge, near the camera; most Android phones read in the middle of the back. Plenty of people hold the card against the wrong spot on the first try and decide it's broken. It isn't.

Things vendors don't usually mention

• NFC works through most phone cases, but not through metal. RFID-blocking wallets block NFC on purpose.
• iPhones don't need an app. iPhone XS and newer read NFC on their own when the screen is on; iPhone 7, 8 and X can read tags from the NFC Tag Reader button in Control Center. Older tutorials that tell people to install a reader app are out of date.
• Phones won't always read while other things are open. An iPhone doesn't read tags while the camera, Wallet or Apple Pay is open, and many Android phones don't read NFC while the camera is open.
• You can write a chip yourself. With a free NFC writing app you can put any web address on a blank NTAG sticker. If you use NoBrandCards, write your card's address with ?s=nfc on the end so your stats count those taps as NFC, and lock the tag once it works so nobody can overwrite it.

QR codes still matter

Every NoBrandCards card has a QR code alongside the chip. Three reasons:

1. Some Android phones have NFC turned off.
2. NFC only works up close; a QR code works across a table or a conference room.
3. You can print a QR code on a slide, a brochure, a sign or a name badge. You can't print NFC.

The QR code printed on a card opens the same page as its chip. The only difference is a small marker in the link, so your stats can tell taps from scans.

So what makes one card better than another?

If the chip is the same and the link is the same, what's different? The page. Some vendors serve slow, app-like pages covered in their own branding. Some serve fast, clean pages that only show you. Some count every visit and tell you where people came from; some tell you nothing.

That's where the real product is. The plastic is interchangeable.

If you're shopping for a card, open our live example on your phone: it's a real card page, with the one-tap save and the "Share your info" form. Then read how it works on iPhone and Android.