Play a 639 Hz tone and adjust the sound below.
A 639Hz signal completes 639 cycles per second. 639Hz lives in a brighter range that cuts through more clearly on smaller speakers and earbuds. It can suit listeners who want a meditation tone that feels more present and less bass-heavy than the lower frequency pages.
Start with your device volume low and stop if playback feels uncomfortable. Do not increase volume to force an inaudible tone to be heard. Browser playback cannot measure hearing thresholds or calibrate sound levels.
Use the preset link on this page to open the Hz Tone Generator at 639Hz instantly. Start with a sine wave for the cleanest reference, then compare it with square or saw when you want more harmonic edge.
639Hz is worth comparing with 528Hz and 741Hz for a clearer sense of upper-mid color. Keep the same playback level when comparing tones.
Audibility depends on your hearing, speakers or headphones, and playback level. A browser tone is not a calibrated hearing test.
Start with a sine wave if you want the cleanest 639Hz reference. Switch to square or saw only when you want more harmonic texture.
Yes. This page links straight into Hzvibe with 639Hz preloaded, so you can return to the same tone or share the URL with someone else.