IMPORTANT: it shows spectrum only for internally played music but not for FM radio or mic, if you have any problems, email me
Make from your phone or tablet a spectrum analyzer for your music.
It show frequency spectrum of music played from your favorite music player running in the background.
Frequency spectrum is shown in logarithmic scale on X approximately from 43Hz to 22kHz and on Y from 0 to -50dB.
You can change the color by long pressing the display.
This app is very simple without any settings and don't use any extra permissions except for audio.
If you like this, you can buy Spectrum Analyzer 2, where is added settings and some enhancements and which cost less than one beer.