Knock is the little ritual for big moments. Tap three times and send good fortune — with your own voice — to family and friends anywhere in the world.
Free to start. Invitation only — ask a friend to knock you in.
The old superstition, made new
Before a big exam. Before the doctor calls back. Before the plane takes off. We reach for the nearest table and knock — for luck, for love, for strength.
Knock takes that tiny act of hope and points it at a person. When you knock, it lands on their phone — a warm tap, a familiar sound, and your voice saying exactly what they need to hear. Good fortune, delivered.
How it works
No feeds, no likes, no noise. Just you, your people, and a knock when it counts.
Invite the people who matter. Each friend or family member gets their own place in your Circle — with a running streak, recent voice knocks, and the last time you connected. Your whole inner world, in one quiet place.
Pick a person, tap the big button three times. Choose a feeling — Love, Proud, Thinking of you — and add your voice if you want. It lands on their phone as a gentle knock-knock-knock, wherever they are in the world.
Every knock — sent and received — flows into a living history. Voice notes show up as waveforms you can replay anytime. One tap and you're back in that morning, that game day, that Friday when everything felt uncertain and your phone buzzed three times.
Add Moments for the days that deserve a knock — birthdays, big games, exam mornings, anniversaries. Knock reminds you when it's time, so the people you love never wonder if you remembered.
Real moments
A knock is small on purpose. That's why it fits everywhere love does.
Every Friday before her grandson's basketball game, Rosa sends three knocks from her armchair two states away. Her voice plays in the locker room: "Play brave, mijo." He's never missed a Friday knock — and swears he plays better because of it.
"I can't be in the bleachers anymore. But I can still be there before tip-off."
Maya moved to Lisbon; her best friend stayed in Seattle. Calls are hard to schedule, but a knock takes three seconds. Their streak is 214 days and counting — a morning knock over coffee on one end, a goodnight knock on the other.
"It's not a text. It's a little 'I've got you' that crosses the ocean."
When Priya's dad went in for surgery, her mom created a family group. For three days, knocks poured in from four siblings across two countries — the same hope, multiplied. Dad woke up to 47 green clovers on his phone.
"Every knock was someone saying 'we're all here.' That matters more than words."
Tom's daughter moved away for college. He still knocks her every morning before her first class. One year in, History surfaced a memory: "You knocked Mom on her birthday 🎂." A small moment, remembered. She cried. He cried. They kept the streak going.
"Knock remembers even when you forget. That's the whole thing."
What makes it special
Knock isn't a messaging app. It's a practice — small, consistent, and surprisingly powerful.
Knock every day and watch the streak climb. It's a tiny mirror of a real relationship — one you built, knock by knock, day by day. Mom is #1 on 47 knocks. That number is pure love.
Big interview at 9 a.m. Tuesday? Schedule a knock the night before and it arrives right when they need it — even if you're asleep on the other side of the world. Good timing is a love language.
Record a short voice message and send it with your knock. "You've got this, sweetheart." It plays on their end — your actual voice, not a notification. Save your best recordings and reuse them whenever you want.
Every knock lives in a timeline you can return to. On This Day surfaces memories from a year ago, two years ago — the morning before the surgery, the night before the wedding. Some knocks are worth keeping forever.
Knock is invitation only. To join, a friend or family member sends you an invite — or simply knocks you first.
That's the charm: everyone inside was brought in by someone who loves them. Ask your luckiest friend for an invite, or download the app and be ready when the knock comes.
Download Knock, record your voice, and send your first three taps of good fortune today.
Download on the App StoreiPhone today. Android is on the way.