The guest’s phone as the door card

A secure access card on the phone

The CodeB Access card answers the door reader with a fresh signature from a key kept in the phone’s secure hardware. It works with readers that support the open PKOC standard, and the check needs no internet.

• Issued through phone.codeb.io by link, QR code or email
• The reader sees a pseudonymous card number, the sites and access groups and the validity period — not the guest’s name
• Only the chosen card answers, briefly and only while the phone is unlocked
• Revoked by the issuer, for example at check-out or when a phone is lost

NFC memory card: read-only or writable

For simple NFC readers, check-in terminals or a Home Assistant automation, the phone can act as a standard NFC tag. Read-only cards carry what you put on them (a link, a text, an ID); writable cards let a reader store new content, which the wallet keeps encrypted and lists.

• Whoever reads a tag can copy its content — use it for convenience, not for security doors
• Many plastic-card readers (for example PN532 setups) read tags but not phones

What guests and staff need

An Android phone with NFC and the CodeB Wallet app (currently a closed beta). iPhone support is coming very soon. Until then, keep keypad or smart-lock codes as the fallback for guests without a compatible phone.

Interested? Talk to us first

Door access depends on the readers and the access system you already have. Tell us which locks or readers you use and how many doors; we check compatibility and set up the issuing with you.