Spectrum View: Wow! How can this app exist on a phone? The app digitizes sound from the microphone, computes the frequency spectrum about 100 times a second, and displays a graph showing how the spectrum changes with time. This particular app is free, which means I shouldn’t complain. And I’m not. But since the app doesn’t provide any way to export the data, it is really nothing more than a fascinating toy. But I think it is fascinating enough to earn a place in my ‘Science’ folder. While looking around I notice that there are several semi-professional apps that will export spectra, and function as oscilloscopes as well. I will review them when I pluck up the courage to blow £15 on an app!