Open—Shape vs Reverse Chord Finder Pro

Open—Shape helps guitarists find playable chord voicings across the fretboard, including in different tunings. Its chord engine searches for shapes, filters them by note count, and supplies difficulty labels and fingering details. Users can chain and reorder chords, play progressions, and save them. The Free plan includes the full chord engine, every voicing, 33 built-in tunings, real acoustic guitar playback, a microphone tuner, and up to three saved progressions. Pro costs $9.99, paid once, billed one-time, and adds unlimited custom tunings and saved progressions. The tuner identifies strings in alternate and custom tunings; capo settings update chord voicings and progressions. A visual Canvas board for connecting chords, tuning, and capo runs in a desktop browser. Open—Shape is available on iOS and the web, and an account is not required. Saved tunings and progressions are stored in browser local storage, with backup export and import in Settings. Its privacy policy says tuner audio is analyzed in the browser and is not recorded or transmitted.

Reverse Chord Finder Pro identifies chord names from two or more selected notes. Notes can be entered through a piano, string-instrument layout or music-score notation. The app includes more than 100 chord types and can play results as block chords or arpeggios. Partial matching helps isolate passing melody notes, while Favorites stores identified chords. String layouts support three to twelve strings, left-handed setups and capo options. Music Score mode offers treble and bass staves in all 12 major and minor keys. Users can inspect intervals, chord structure and naming options. Supported instruments include piano, guitar, bass, ukulele and other three- to twelve-string instruments. It runs on iOS and macOS; listings require iOS 15.6 or later and macOS 13.0 or later on Apple M1 or later. Pricing includes a seven-day trial, with personal, family and lifetime plans.