SpectralScan Audio Analyzer

SpectralScan is a real-time spectrum analyzer (analyser), RTA, and frequency detector for your phone. See sound as an audio spectrum and spectrogram, find the peak frequency of any tone, read levels in decibels (dB), and test the acoustics of your room and speakers. Free, no ads, with an optional one-time Pro unlock.

SpectralScan shows you what sound actually looks like. Watch frequencies dance in real-time, capture accurate measurements of speakers and rooms, or just geek out watching the spectrogram waterfall paint a picture of the soundscape around you.

REAL-TIME SPECTRUM ANALYZER (RTA)

See audio frequencies as they happen. Dual time smoothing lines with octave smoothing show both instant peaks and averaged levels.

FREQUENCY DETECTOR

Find the dominant frequency of any sound instantly. Peak hold and peak frequency detection show you exactly which note or tone is loudest, handy for tuning, tracking down a hum, or identifying resonances.

SWEEP MEASUREMENTS

Run a sine sweep through your speakers and capture the frequency response with precision. Unlike simple RTA, sweep measurements cut through ambient noise to reveal the true character of your audio gear. Save multiple curves and compare them side by side in pro version.

IMPULSE RESPONSE

See how your room or speakers respond over time. The impulse view shows reflections, decay, and resonances. Useful for acoustic treatment and speaker placement.

SPECTROGRAM

Watch sound unfold over time in a scrolling waterfall display. Great for visualizing music, speech patterns, or tracking down that annoying hum.

FEATURES

• Real-time FFT spectrum analyzer and frequency detector

• dBFS (decibel) scale from -160 to 0

• Log frequency axis (20 Hz - 20 kHz)

• Time and frequency smoothing

• Spectrum and impulse response plots

• Peak hold and peak frequency detection

• Multiple color themes

• Works offline

• Export measurements as CSV or PNG

Whether you need a frequency analyzer or frequency detector for speaker setup, an FFT view of your microphone input, or a spectrogram to detect and track down a hum, SpectralScan covers it.

Built for musicians, audio engineers, acoustics nerds, HiFi enthusiasts and anyone who's ever wondered "what does that sound look like?"