Spectrum Meter

Spectrum Meter is an offline sound spectrum analyzer for testing sound sources, characterizing equipment noise, and understanding what an audio input is actually delivering.

• View peak frequency, tone level, and noise floor in real time.

• Switch between full range from 20 Hz and a focused ultrasonic band above 15 kHz.

• Displays negotiated sample rate, theoretical ceiling, observed usable bandwidth, and resolution simultaneously.

• Select the available audio input and detect when the system routes it to another source.

• Save peak events with frequency, level, time, and duration.

• Calibrate with an acoustic reference of 94/114 dB SPL or with a manual offset.

• Works completely offline: audio is measured on the device and is never recorded, uploaded, or sent to a server.

Important: Without calibration, the level is relative dBFS, not dB SPL, and the app is not a sound level meter reading. A driver may declare a high sample rate while the actual signal ends up at a lower frequency; Spectrum Meter displays both values ​​instead of hiding that limitation.