Trim to exact times with fades, resample, fold to mono or stereo, and export a real WAV file.
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.
Sound pressure level, intensity addition of independent sources, and inverse-distance falloff, with the arithmetic shown.
Type a size and a label, then download a real PNG, a real SVG or a copyable data URI.
Infer a draft-07 schema from an example value, edit it, then validate a document and read every error path.
A real SM-2 deck: grade each card Again, Hard, Good or Easy and get true intervals, real due dates and a 21-day forecast.
Write multiple-choice questions, mark the key, then run the quiz shuffled and score it with a review list of every miss.
