Frequency Trainer is an audio frequency trainer web application. It can be a used as a training tool for audio technicians to learn to recognize frequencies.
It is mainly written in JavaScript. As it is a web application, it also consists of HTML and CSS.
A demo is available: http://www.frequencytrainer.com
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A modern browser
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Speakers or headphones
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Download & unzip
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Open index.html in your (favorite) browser
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Make sure your speaker or headphone volume isn't set too high
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Press 'Start'
- It's possible you can't hear every frequency. Some speakers or headphones can't play and some people can't hear extreme low or extreme high frequencies.