From Keith Wiley:
WildSpectra Mobile Pro for Android provides real-time scrolling audio spectrogram (sonograms) on handheld computing devices. It also provides waveform and spectrum views, as well as a level meter. Once a recording has been made and resides in memory, a number of post-processing operations can be performed and the resulting recording can be saved or images of the spectrogram can be saved for later use.
What's new in this version:
Version 2.0.2 includes bug fixes.