Observed arrival · 2026-09-24
HertzSpot: Point at a sound
A free browser-based spectrum analyzer turns audio files or microphone input into a spectrogram you can inspect for frequency, musical note, and loudness.
○Open
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$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Audio editors, musicians, singers, and sound engineers
- Worth noticing
- Hovering over a spot returns its frequency, nearest musical note with octave, and level in decibels.
Field notes
The guide maps visual patterns to sound: sustained tones appear as horizontal lines, clicks as vertical stripes, and noise as a broad wash. It lists audio and video file formats and says zooming recalculates the image instead of stretching it. The page describes file decoding as local, with no upload or account required.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue