FFTWave is a free Android application developed by E.N.Software that allows users to monitor and analyze sound in real-time. The app displays the waveform of the sound from the microphone, and also provides a spectrum using Fourier transform. With this app, users can check the frequency characteristics of the sound in real-time.

FFTWave comes with several useful features, including peak detection and peak hold. The pinch zoom gestures support further enhances the user experience. The app is particularly helpful for sound adjustment and howling analysis.

Overall, FFTWave is a reliable and user-friendly app that provides accurate sound monitoring and analysis in real-time. It is a must-have for individuals who work with sound or want to analyze the sound around them.