FlexChords turns any YouTube video or audio file into accurate, synchronized guitar chords in seconds. Unlike tools with noisy predictions or paywalls, FlexChords pairs deep learning with music-theory smoothing to eliminate glitches and deliver clean, musical progressions. Features include YouTube & audio chord detection, synced playback & real-time chords, interactive timeline with chord editor, key & tempo estimation. Instant access to unlimited catalog songs + 5 free custom scans (per month).