Spectrum Analyser

keuwlsoft

About this app

Audio spectrum analyser for your microphone.

64 up to 8192 frequency divisions (128 to 16384 FFT size).
22 kHz spectrum range (can reduce down to 1 kHz for higher resolution).
FFT Windowing (Bartlett, Blackman, Flat Top, Hanning, Hamming, Tukey, Welch, or none)
Auto-scale or pinch to zoom, drag to pan.
Linear or logarithmic scales.
Peak frequency detection (polynomial fit).
Averaging, Min and Max.
Save CSV data files (uses Write External Storage Permission).
Free or snap to peak cursor.
Octave Bands - Full, half, third, sixth, ninth or twelfth bands.
Weighting – A, C or None (A weighting filters the high and low frequencies according to how the ear perceives sound loudness).
Musical note indicator (green if within 5 cents, orange if within 10 cents).
Auto-scaling microphone input trace.
For best response on slower devices, keep the FFT size low.

More detailed explanation available on website

Ratings and reviews

Useful but the screen update interval is too slow. Others manage 30 frames per sec for a smooth graph. Its running 2 frames/sec no matter how far up/down I set various options. Buttons on the control panel too small to use, must have been programmed on a low res screen. Adjustable dB and Hz axis is useful as is C, Z and A dB weighing. But, it shows no response below about 50Hz even though my mic works far below that. It could be a nice app but it needs updating.

Fantastic. Had the basic options that the 623 other analyzers don't. This app allows almost everything from the bundled fft library. I got it for custom frequency ranges, but I think it's overall one of the better frequency analyzers. 90% of what's available on the play store is bad AliExpress-like UI loaded with advertisements (spamware?) and untrustworthy garbage.

As far as a spectrum anilyzer goes it does alright but you can't adjust where the display line sits. Either nearly maxed at top or mostly unseen at the bottom unless you turn up the sound? Using it to set up speakers for flat output will require a source playing test tones since this has none built in. The auto leveling is hindering it's usefulness as a testing tool, you're limited in source volume output.

What's new

v1.43 Updated to use newer code methods to better target and run reliably on devices in 2024. You can now select between audio source (default, mic or unprocessed) in the Weight/Source sub menu.