FlexChords detects the chords in a YouTube video or an uploaded audio track and shows them as a chart synced to playback, along with the song's key and tempo. You can transpose, edit the detected chords and keep your edits in your account; the maker says charts can also be exported to MIDI. The chord model was trained by the developer, and the site publishes how its accuracy was measured on songs the model had not heard. Every song already in the catalog is free to open and play, with or without an account. A free account adds five new songs a month (up to 12 minutes each); one-time song packs cost $2.99 for 10, $5.99 for 30 or $12.99 for 100, with rupee pricing in India. A Pro plan with practice tools is listed as coming soon.
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