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. FREE FEATURES Real-time Hz detection from any audio or video element Badge display showing the current frequency Works on any website with media playback 10-second detection sessions, unlimited use PRO FEATURES (one-time $9 purchase) Musical note detection with cents tuning indicator Live spectrum visualizer (20 Hz – 5 kHz) Multi-frequency peak analysis with dB levels Unlimited detection time Always-On mode: automatically detects audio as you switch tabs 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 required. No tracking. No data collection. The only time we communicate with a server is during Pro upgrade purchase and code redemption. 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.