Heartstring — Two Hearts, One Thread
Two phones, any distance: each of you rests a thumb on the camera and your real heartbeats braid into one glowing thread that buzzes with the other’s pulse.
- 💕 Love Bird
- ✓ Free
- ✓ No sign-up
- ✓ Private — runs in your browser
- ✓ Any device
Two phones, two fingertips, one luminous thread. Each phone reads its owner's pulse from the camera and streams it to the other — watch your two hearts try to beat as one. 💞
Invite your other half
Scan this on a second phone, or share the link / code.
You can start now — your partner can join any time.
Camera blocked 🔒
Allow camera access (tap the 🔒 / camera icon near the address bar), then press start again.
Your pulse is live 💗
As soon as your partner joins, both hearts light up the thread.
This device can't vibrate — you'll still see the beat light up.
Just for fun — not a medical device. Heartstring estimates each pulse from camera light and can be off, especially with movement or poor lighting. Don't use it for any health decision. Everything stays peer-to-peer between your two phones — no pulse data is ever uploaded.
Best on two phones with a back camera + flashlight, on the same Wi-Fi. The flashlight may switch on — that's normal and sharpens the reading.
Why you’ll love Heartstring — Two Hearts, One Thread
How to use it
- 01
Open it
No download and no login — the tool is ready right at the top of this page.
- 02
Use it
Enter your details or start interacting. Everything updates live as you go.
- 03
Get your result
Copy, download or share your result in a single tap. That’s it.
About Heartstring — Two Hearts, One Thread
Heartstring lets you share your real heartbeat with someone across any distance. Rest a thumb on each phone's camera, and the app detects your pulse to create a glowing thread that visualizes both hearts synchronizing. It's a free browser tool—no signup needed, no data leaves your device, just an intimate way to feel connected when you're apart.
Built for long-distance couples, Heartstring turns a simple biometric into something meaningful. When you sync your two phones, each heartbeat appears as a pulsing thread that mirrors the other person's rhythm. The buzzing sensation adds a tactile layer, making distance feel smaller for that moment you're connected together.
The technology works entirely in your browser by detecting blood flow through your fingertip via the camera sensor. Both heartbeats stay private on your phones—nothing is recorded, stored, or sent anywhere. It's a lightweight way to share something as personal as your pulse without sacrificing privacy.
Popular uses
- ✦ Long-distance couples checking in with an intimate pulse sync before bed.
- ✦ Staying grounded together during a stressful call or conversation.
- ✦ A synchronized moment of breathing and heartbeat alignment for couples meditation.
- ✦ Sending a felt connection when words aren't enough—across time zones or continents.
- ✦ A private ritual that reminds you someone's real heartbeat is beating alongside yours.
Frequently asked questions
How does Heartstring detect my heartbeat?
Can I use it with someone far away?
Is my heartbeat data private?
How accurate is the heartbeat detection?
Is Heartstring — Two Hearts, One Thread free to use?
Is it really just for fun?
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