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About the application:

Designed with accuracy and simple of use in mind. Can be used for monitoring or measuring environmental sound or noise; assist tuning instruments; timing short sound happenings; and educational purpose. Features: * No Advertisements. * With log or linear frequency axis. * Can label frequency axis using melody pitch note. * Help all possible sampling rates and almost all recorder sources of your device. * Graph with nice grid lines and labels, simple to operate. * FFT sample size range from 512 to 8192. Using half-overlapped (adjustable) time window to increase time resolution. * Different window functions provided, for various frequency resolution and dynamical range. * Peak frequency detection (in unit of Hz and note+cent), with a moderate accuracy (FFT + interpolation). * With dB or A-weighting dB (dBA). * Can record the audio in wav (PCM) format. * Pinch to zoom, drag or swipe to move, long-press to put cursor, double touch to restart zoom. Notes: ** May need some knowledge of discrete Fourier transform and spectrum analysis to use it well. ** The actual accuracy mainly depends on your device. No calibration interface provided. Comments and recommendations are welcome.