Spectroid is a real-time audio spectrum analyzer with reasonable frequency resolution across the the entire frequency spectrum.

💬 FAQ 💬

Q: Why are the dB values negative?
A: Spectroid uses dBFS (Full Scale) where 0 dB is the maximum power that the microphone can measure, so the decibel values are negative because the measured power is less than the maximum power.

Q: Can I zoom in on the spectrum plot?
A: Yes, do a two-finger pinch-to-zoom gesture.

Q: Why are there discontinuities/gaps in the spectrum plot and waterfall?
A: Spectroid uses multiple FFTs overlapped in frequency in order to provide better frequency resolution at lower frequencies than a single FFT. The caveat of this method is varied impulse response and minor discontinuities in frequency. The upside is that it can efficiently produce a spectrum that better matches the frequency resolution of human audio perception. It's still probably not as good as your ears though!

Q: Can I export the spectrum data?
A: Spectroid doesn't make your device a calibrated instrument. If you need the spectrum data then you should be using an actual spectrum analyzer rather than an app on your mobile device.

From version Spectroid 1.1.2:

Fix missing spectrum plot on Android P.

All versions
Spectroid 1.1.2
September 9, 2022

Version:1.1.2

Uploaded:September 9, 2022 at 5:27PM UTC

File size:0.1 MB

Downloads:75

Spectroid 1.1.1
August 4, 2018

Version:1.1.1

Uploaded:August 4, 2018 at 4:43AM UTC

File size:0.11 MB

Downloads:702

Spectroid 1.1.0
March 16, 2018

Version:1.1.0

Uploaded:March 16, 2018 at 12:59PM UTC

File size:0.11 MB

Downloads:52