Spectrum Analyser

1.84K reviews
Content rating
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About this app

Free audio spectrum analyser for your microphone.
No ads. Full version.

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
Updated on
Feb 5, 2021

Data safety

Developers can show information here about how their app collects and uses your data. Learn more about data safety
No information available
1.84K reviews
A Google user
October 11, 2019
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.
18 people found this review helpful
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Robert Zinda
August 26, 2022
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.
4 people found this review helpful
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Brian D Suggs
March 24, 2021
I beginning to think that anything kewl does is just cool and fun to use. For me that's what peaks my interest towards the more serious side that apps like this have to offer. This kewl app has a lot to expand on, when comes to the serious side of sound frequencies and I appreciate the information that they supply with many of their apps that make it easier to explore what the app is capable of. Kewl respects that the average end app user isn't always a scientist. Thanks for yet anothe kewl app!
13 people found this review helpful
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What's new

Updated to run better on newer devices. Save file dialog added and save location changed. A few other minor modifications/fixes.