FQC - Frequency Counter

FQC is a real-time audio frequency counter for iOS.

Measure audio frequencies using your Mac’s built-in microphone or connected audio devices. FQC displays frequency in Hz or KHz, identifies musical notes, and provides signal level monitoring in a simple, easy-to-read interface.

Features:

• Real-time frequency measurement • Musical note identification • High and Low Frequency detection modes • One Shot capture mode • Automatic noise floor calibration • Signal level meter • Frequency display in Hz and KHz • Simple, distraction-free interface

The Low Frequency mode is optimized for bass notes, speakers, motors, and other low-frequency signals, while High Frequency mode provides fast response for general audio measurements.

FQC performs all frequency analysis locally on your device.

No accounts. No subscriptions. No advertising. No tracking.

Designed for hobbyists, musicians, audio enthusiasts, electronics experimenters, and anyone needing a simple frequency measurement tool.