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Features 1/1, 1/3 & 1/6 octave RTA modes, RT60 (wideband, Octave), spectrogram, peak frequency, Fast, Medium & Slow filters, Flat & A/C Weighting, Averaging, SPL Chart Recorder, Noise Criteria, White/Pink Noise, Sine, Square, Triangle, Sweep, Ramp and Impulse signals & loudspeaker polarity checker.
Frequency spectrum store & load, von Hann windowing, "Keep Screen On".
Now with ISO Octave Calibration feature - correct for your phone's microphone response! Move the calibration discs up or down so as to obtain a flat response, and match the overall SPL to that of an external meter.
AudioTools's Spectrum Analyzer component uses FFT on batches of samples recorded at the microphone. Hann windowing reduces aliasing. Recorded spectra may be stored as files on the SD card, and then loaded later and displayed together with the live spectrum.