Sound tools

Make and measure sound, free in your browser. Play any frequency from 1 Hz to 20,000 Hz with a tone generator that sweeps, stacks several tones at once, and saves a WAV. Sound a dog whistle at the highest pitch your own device can produce, as one long note or in short pips. Run white, pink, brown or grey noise for as long as you like, with a sleep timer that fades out by itself. Find out which frequencies you can still hear, one ear at a time, and keep the chart. Or check how loud your room is with a live decibel meter that shows what your reading compares to in real life. Nothing is uploaded, whichever you use.