Spectroid

Carl Reinke

About this app

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.

Ratings and reviews

This is the best spectrum analyzer on Android and I've tried many. It's a very accurate and fast analyzer. And I appreciate the color choices, it make it easy to see peak signal, current signal, clipping, and the heat map. My only gripe I wish the app didn't pause when you turn your phone from portrait to landscape, but that's a minor gripe. That and I wish this app existed for my iPad.

I like the app but it would be really cool if you could actually load like a calibration file then make your mic a little more accurate. it seems odd it doesn't have the different weightings to choose from. I'm assuming unprocessed is basically flat or unweighted? I'm not sure. But I would pay something for giving it a few more features and the ability to load a calibration file would be really cool. Maybe to load and save charts too.

As a part time audio engineer, this is great for me. I tried it with a couple of other similar apps, and this one seemed to be the cleanest, most precise, and reliable. Awesome when I need a little help nailing down a feedback frequency or hiss in a new microphone 4 stars because I can only seem to get it to register up to 24kHz, when I need it up to 28kHz. Also would be nice to be able to export the data. Small complaints for a great app though.

What’s new

◆ Improve usability on high-density displays