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Browser-based Chinese tone trainer scores pitch contours without uploading audio

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A developer built a free, browser-only tool that helps learners of Chinese tones by recording a single syllable and plotting its pitch curve against the target tone. The tool runs entirely on the user's device, so no audio is sent to a server, and it requires no app download or account. To get usable recordings, the developer turned off the browser's default microphone processing, since automatic gain control and noise suppression distort pitch information. Pitch is extracted with the YIN algorithm, which avoids the octave errors common in simpler autocorrelation methods. The write-up also covers how the contours are normalized and scored, including extending the scoring from single syllables to whole words and sentences.

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