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Radix-2 FFT of any audio file with band energies, spectral centroid and a peak-hold readout.
Work out the real file size of an audio file at any bitrate, sample rate or channel count.
Translate text to Morse and back, then play the symbols as real tones through Web Audio.
Sound pressure level, intensity addition of independent sources, and inverse-distance falloff, with the arithmetic shown.
Pull a palette out of any image you drop in.
Resize an image to every favicon size and zip it.
Length, mass, temperature, data and more.
Everyday arithmetic and percentages, for quick sums.
