What feedback should a speaking app give me?

It should name the specific sound, word or syllable that went wrong, show a correction you can physically perform, and let you record again immediately with a comparison. A percentage on its own is a number, not feedback, however accurate the underlying model happens to be.

Three things: the exact sound or word that went wrong, a correction you can physically perform, and an immediate retry with a comparison. A percentage without those is an assessment rather than feedback, however good the model is.

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