Call anyone, anywhere, free. No downloads. No phone number required. Just knock.
NEVER MISS A CALL
Knocking on someone's door is a basic human right. Anyone can walk up and ring the bell in good will. Knock Knock digitizes that right — if you know someone's email, you can reach them, anywhere in the world, free.
Why Knock Knock
Works in any modern browser. Chrome, Firefox, Edge. Open a tab and you're live. No app stores, no installs, no updates.
Your email address is your calling identity. Share it with anyone in the world. No SIM, no carrier, no geographic restrictions.
Core calling is always free. No subscription required to call across the world. We'll add premium features later — the knock stays free.
How it works
Enter your email address. We send a 6-digit code. That's your identity. No password, no account creation form, no personal data required.
Type the email of the person you want to call and hit Knock. They get a real-time notification and an email link — no account required to answer.
When they answer, you're connected. HD audio via WebRTC — peer to peer, encrypted, no recordings. Like sitting next to each other, anywhere in the world.
Imran in DC knocking his Dad in Karachi — like they were sitting next to each other.
That is the product. No conference call link. No "can you hear me?" No downloading anything. One knock. One answer. Two people, one conversation, zero friction — no matter where in the world they are.
Free. No downloads. Works right now.
Get started free