Echo Tape — Sonar Tape Measure
Point your phone at a wall and tap: it chirps an inaudible pulse, listens for the echo, and reads back the distance. Acoustic ranging in a browser.
Sonar needs mic + speaker access
Aim the phone's bottom edge straight at a hard flat wall, then tap Ping.
≈ · ± spread
Emits a faint high-pitched chirp — keep the room quiet.
The echo lag is measured between two peaks in the same recording, so the phone's audio delay cancels out on its own — what's left is a small constant offset from the speaker↔mic geometry. Hold the phone's bottom edge exactly the chosen distance from a hard flat wall, then calibrate to measure and remove that offset.
Not yet calibrated — readings assume zero offset and may be off by a few cm.
More pings = steadier reading but takes longer.
Sound travels faster in warm air — this refines the distance.
🎯 How accurate is this? Acoustic ranging in a browser is genuinely hard and approximate — expect a few cm of error at best, and it can fail entirely on soft, angled or distant surfaces. Best results: a quiet room, a hard flat wall roughly 0.3–4 m away, phone speaker pointed straight at it, and a fresh calibration. All audio is processed on-device — nothing is uploaded.
Why you’ll love Echo Tape — Sonar Tape Measure
Instant & free
No signup, no paywall, no limits — Echo Tape — Sonar Tape Measure 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.
Frequently asked questions
Echo Tape — Sonar Tape Measure 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.
Completely. Echo Tape — Sonar Tape Measure 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.
Yes. The tool is fully responsive and touch-friendly, so it works great on phones and tablets as well as computers.
Global Maple System — a software & AI studio. We built Echo Tape — Sonar Tape Measure (and 200+ other free tools) to show what we can do. Need something custom built? We’d love to help.
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