We have all been there. Stuck at an airport next to someone screaming on speakerphone or blasting TikToks on full volume. Asking nicely does not work anymore. One developer at Mumbai airport faced this exact situation and built something brilliant.
STFU is a browser-based speech jammer that uses Delayed Auditory Feedback (DAF) to make it physically difficult for someone to keep talking. It listens through the microphone, delays the audio by milliseconds, and plays it back. The brain cannot process its own voice with a delay, causing the speaker to stumble and stop.
How the Speech Jammer Works
The science behind this is fascinating. When you hear your own voice delayed by roughly 200 milliseconds, your brain’s speech production loop breaks. This is called Delayed Auditory Feedback, and it has been studied for decades in speech therapy and psychology.
STFU implements this entirely in the browser using the Web Audio API. No installation, no servers, no data leaving your device. Open the page, hit play, and point it at the noise source.
The creator built it with a single prompt to Claude and it worked on the first try. The entire codebase is minimal, relying on modern browser APIs for audio capture and playback.
| Feature | Detail |
|---|---|
| Technology | Web Audio API, browser-based |
| Delay Range | Configurable, ~200ms default |
| Platform | Any modern browser |
| Privacy | 100% client-side, no data sent anywhere |
Real-World Reactions
STFU has been gathering attention from people who deal with noisy environments regularly.
“The Ontario Science Centre in Toronto used to have something like this. It was VERY effective.” – @jimmyzjammyz
“Love to try this on Sydney trains.” – @rails4sandeep
How Delayed Auditory Feedback works
DAF works by exploiting the natural feedback loop in human speech production. When you speak, your brain monitors your voice in real-time. Introducing a delay confuses the neural pathway, causing stuttering, slowing, or complete cessation of speech. It is the same mechanism used in some stuttering therapy devices.
Project Link
This is one of those projects that makes you wonder why nobody built it sooner. If you travel frequently or work in open-plan offices, bookmark this one. It might just save your next flight.
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