Two-Phone Sound Radar
Open it on two phones a known distance apart; clap or talk and a live dial swings toward the sound — two ordinary phones become a directional microphone array.
Pair two phones, clap once, and watch the radar point toward the sound.
This device can't run Sound Radar
Open this on your second phone
Scan the code, or type the short code into Sound Radar on the other device.
Join the other phone
Type the short code shown on the host phone (or open its link).
Pair both phones on the same Wi-Fi (peer-to-peer, nothing is uploaded).
Lay them flat a known distance apart and tell us that baseline gap.
We sync their clocks, both phones listen, and a sharp clap reveals the direction.
Pick which side this phone sits on. Both phones must agree — set the other one to the opposite side.
Wider gap = more accurate angle. Beyond the baseline, sound from far away arrives almost in parallel.
Sync is shaky (high jitter). Keep both phones awake on the same Wi-Fi and re-sync for a sharper reading.
We ping-pong timestamps NTP-style to line up this phone's clock with the host's. Tap this on both phones — each one syncs itself. Re-run if either phone was just unlocked.
Both phones will ask for microphone permission.
Higher = reacts to softer sounds (and more false triggers). Lower = needs a sharp, loud clap.
🧪 Fun approximation. Phone mics, Wi-Fi clock sync and audio buffering each add a few milliseconds of jitter — and sound travels ~343 m/s, so a 0.3 m gap is under a millisecond of difference. Treat the needle as a playful estimate, not a survey instrument. 100% on-device & peer-to-peer — no audio ever leaves your phones.
Why you’ll love Two-Phone Sound Radar
Instant & free
No signup, no paywall, no limits — Two-Phone Sound Radar 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.
Uses your real device
Taps into your actual camera, mic or motion sensors — right in the browser.
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.
About Two-Phone Sound Radar
Turn two ordinary phones into a directional microphone array with this browser-based sound radar. Position two phones a known distance apart, then clap or talk—a live dial swings toward the source, letting you pinpoint sound direction in real time. It's an elegant demonstration of acoustic localization using your existing devices.
The tool runs entirely in your browser with no signup required, and your audio data never leaves your device. By comparing sound arrival times between two phones, it calculates the direction of incoming sound, functioning as a two-phone radar for sound triangulation. Open it instantly on any mobile device and start locating sound sources without any special equipment or configuration.
Perfect for understanding how directional microphones work or spotting where a sound is coming from in your environment. Since both phones stay local to your network, everything happens privately on your devices. Refresh your understanding of acoustic principles with a genuinely useful tool that proves two phones can become much more than phones.
Popular uses
Frequently asked questions
Accuracy depends on the distance between your two phones and the frequency of the sound. Sounds with longer wavelengths (lower frequencies) are harder to localize precisely, while sharper sounds like claps give quicker, clearer readings. Position phones several feet apart for best results, and expect directional accuracy within 10-30 degrees depending on conditions.
No. Open the tool in any mobile browser—no installation, no signup, no apps to download. Just load it on two phones and you're ready to start detecting sound direction. Everything runs directly in your browser without requiring any special permissions or configuration.
Professional audio equipment uses calibrated sensors, multiple channels, and specialized algorithms for extreme precision. This tool uses your phone's standard microphone to demonstrate the same acoustic localization principle at a basic level. It's perfect for learning or casual sound detection, not for precision audio engineering or recording.
Yes. All processing happens on your devices—nothing is uploaded, stored, or shared. The two-phone radar works entirely offline once loaded in your browser, so your sound and audio data never leave your control.
Two-Phone Sound Radar is 100% free — no signup, no watermarks and no usage limits. It’s one of 200+ free tools we build and give away.
No. All sensor data is processed live on your device and never leaves it or gets stored.
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