12 client-side audio tools for audiophiles and sound engineers, all running in the browser. No account, no upload, no tracking. Includes: headphone amp power calculator, speaker amp power calculator, room mode visualizer, ABX double-blind test, Golden Ear frequency training, audio signal generator, hi-res audio fraud detector (FFT), SPL safe-listening timer, cable gauge calculator, treble roll-off calculator, and more. The math pro audio software charges for, free.