Now in Early Access: live audio calls on iPhone

Someone's at your door.
But you don't have to be.

Visitors scan the QR on your door and leave a message — text, photo, or voice. Live audio calls are in Early Access in the iPhone app, on Pro doors you turn them on for. No hardware, no app for them.

Create your KNOC See how it works

One Door free. Pro adds more Doors, longer history, and Early Access live audio calls on iPhone.

A courier at a front door scanning a printed KNOC QR card at dusk.

Set up your first door in a minute.

Scan either code to install KNOC on your phone — or create your account on the web and print your QR.

Install KNOC on your phone — or create your account on the web and print your QR.

QR code — scan to open KNOC on the App Store
Download on the App Store
Get it on Google Play
QR code — scan to open KNOC on Google Play

Audio calling isn't available on Android yet.

How the QR doorbell works

  1. 1 Print your QRPut a KNOC code where visitors can find it.
  2. 2 Visitors scan & messageThey leave a message — no app, no account.
  3. 3 Reply from your phoneAnswer with text or voice. Your number stays private.
How it works →

No app for visitors · No hardware · No phone number shared · Privacy-first

What KNOC does, and what's next

Available Now

Things you can use today.

  • A QR code on your door. Visitors scan it and reach you — no app, no account for them.
  • Text, photo, and voice messages, with your phone number kept private.
  • Reply from your phone or the web.
  • More Doors and longer conversations on Pro.
  • KNOC for Android — visitor messages and replies. New

In Development

Nothing we're ready to announce here yet.

Exploring

Ideas we're considering. Not promised.

  • Live video calls.
  • Weatherproof, branded KNOC door decals.
  • Apartment and multi-unit routing.
  • Optional WhatsApp updates for visitors.