You say it.
It says back what to fix.
Read a passage out loud. Sayback listens in American English and shows you the exact sound that slipped, and how to place your mouth to get it.
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Private instance · one voice, one account
YOU SAID
very
/v/58
/ɛ/92
/ɹ/74
/i/95
Your /v/ is landing closer to /w/. Rest your lower lip against your upper teeth and let it buzz before the vowel.
WHAT IT DOES
Sound by sound
Every word is split into the sounds it is actually made of, and each one is scored on its own. You see which sound moved the number, not just the number.
The fix, not the verdict
A score tells you something went wrong. Sayback tells you where your tongue goes, which lip touches which tooth, and what to listen for.
Say it again
Re-record a single word and hear the difference straight away. The loop is short on purpose, because that is how a sound sticks.