ChordU
7.9#1 in chord finder softwareFrom $50 a yearFree planAndroidiOSWeb
VisitChordU suits musicians who want chord and notation references from audio or YouTube songs. It supports diagrams for guitar, piano, ukulele, and mandolin.
Open—Shape suits guitar players who want to explore chord voicings, work in alternate tunings, or build progressions. The free plan covers built-in tunings and up to three saved progressions; Pro is for unlimited custom tunings and saves.