Chordify
7.3#4 in chord finder softwareFrom $2 a monthAndroidiOSWebAPI
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Chordify suits beginners learning an instrument as well as working musicians who want chord guidance while playing. It supports guitar, ukulele, piano, and mandolin, with mandolin limited to the website and Android app.
Chordio suits producers, composers, teachers and learners who want music theory tools alongside composition and sheet music features. It is for Apple-platform users; there is no Android app.