Bismark BS-Spectrum Tool is a free Android application developed by TadaoYamaoka that calculates FFT (Fast Fourier Transform) of the sound recorded on your device's internal microphone. The calculated data is then displayed as a graph. This app is an excellent tool for audio enthusiasts who want to analyze the sound quality of their recordings.

One of the main features of this app is the ability to display peak amplitude and frequency. This feature is particularly useful for those who want to identify specific frequencies in the recorded sound. The app also allows users to store a snapshot of the waveform and compare it with real-time waveforms. This feature is especially handy when analyzing the changes in the waveform over time.