Hertz Detector

Detects the dominant frequency (Hz) of audio playing in the current tab.

🎧 Hertz Detector analyzes audio playing in your browser tab and shows you the dominant frequency in real time. Click Detect on any tab with audio — YouTube, Spotify, a tone generator, or any site with media — and instantly see the frequency in Hz. The detected value also appears on the extension badge so you can monitor it at a glance. ✨ EVERY FEATURE INCLUDED — FREE 📈 Real-time Hz detection from any audio or video element 🎹 Musical note detection with cents tuning indicator 🌈 Live spectrum visualizer (20 Hz – 5 kHz) 📊 Multi-frequency peak analysis with dB levels 🔢 Badge display showing the current frequency ♾️ Unlimited detection time — no session limits 🔄 Always-On mode: automatically detects audio as you switch tabs 🌐 Works on any website with media playback 🎁 No accounts. No subscriptions. No upgrades to buy. Everything the extension can do, it does from the moment you install it. ⚙️ HOW IT WORKS Hertz Detector uses the Web Audio API to analyze frequency data from audio and video elements on the page. All analysis happens locally in your browser — no audio is ever recorded, transmitted, or stored. 🔒 PRIVACY No accounts. No tracking. No data collection. No servers. Hertz Detector runs entirely on your device and makes no network requests of its own — your audio and browsing never leave your browser. See our full privacy policy at bambamhq.com/privacy. 💬 SUPPORT Need help or have feedback? Use the Support link in the extension or chat with us at bambamhq.com.