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.
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
Instant & free
No signup, no paywall, no limits — Heartstring — Two Hearts, One Thread works the moment the page loads.
Completely private
Everything runs in your browser. Nothing you enter is ever uploaded or stored on a server.
Works on any device
Fully responsive and touch-friendly — use it on your phone, tablet or desktop.
Made for two
A little moment built to share with someone you love.
How to use it
Open it
No download and no login — the tool is ready right at the top of this page.
Use it
Enter your details or start interacting. Everything updates live as you go.
Get your result
Copy, download or share your result in a single tap. That’s it.
Frequently asked questions
Heartstring — Two Hearts, One Thread is 100% free — no signup, no watermarks and no usage limits. It’s one of 200+ free tools we build and give away.
Yes — it’s a playful, romantic little tool to enjoy together. Nothing leaves your device.
Completely. Heartstring — Two Hearts, One Thread runs entirely in your browser (client-side). Nothing you type, upload or generate is sent to our servers, so your data never leaves your device.
No. It works instantly in any modern web browser — Chrome, Safari, Edge or Firefox — on desktop and mobile. You can even install this site as an app.
Yes. The tool is fully responsive and touch-friendly, so it works great on phones and tablets as well as computers.
Workaholic Developers — a software & AI studio. We built Heartstring — Two Hearts, One Thread (and 200+ other free tools) to show what we can do. Need something custom built? We’d love to help.
More Love Birds
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We built this. We can build yours.
Heartstring — Two Hearts, One Thread is one of 200+ free tools from Workaholic Developers — a software & AI studio. Need a website, app, AI agent or automation? Let’s talk.
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