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The Online Tone Generator uses Mozilla's recently developed Audio Data API for use with HTML5. It is currently only compatible with Firefox version 4.0 or above. More details can be found on the Mozilla Wiki.
All frequencies on this site were calculated using equal temperament with a reference of A4 = 440Hz. All semitones have a frequency ratio of the twelfth root of two. See Wikipedia's entry on equal temperament for more details.
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All donations to Online Tone Generator are gratefully accepted and always go straight into improving the site.
Online Tone Generator is proud to be hosted by Vidahost.
Why not visit our partner site, KeepToTheBeat.com? It's perfect for all your musical time-keeping needs.