7 Chords is a highly recommended iPhone application for musicians, featured by Apple on the iTunes store front page as "New and Noteworthy." Developed by Stefan Wundrak, this multimedia program falls under the category of Music & Radio.

Described as the ultimate tool for improving knowledge of guitar chords and music theory, 7 Chords is a comprehensive library that caters to both beginners and intermediate guitar players. Unlike other programs, it utilizes clear and understandable tab notation commonly found in guitar books and fingering charts.

Picking a chord is effortless with 7 Chords. Users can select the base tone and variety of the chord on the pick-wheel, then choose the voicing by sliding through the chord pages. The program displays the chord name, the frets to play, the fingers to use (including information like barré), and the actual tones played. With over 1500 of the most common guitar chords for electric or acoustic guitars, 7 Chords covers a wide range of chord varieties, including sus2, sus4, 5, +, 6, 7, 7sus4, o7, 7b5, 7+5, 7b9, 7#9, maj7, 9, 11, 13, m, m6, m7, m7b5, mMaj7, m9, +9, and maj9.

Furthermore, users can tap or double tap on a chord to hear it played through their iPhone speaker. With its user-friendly interface and extensive chord library, 7 Chords is praised by users and experts alike for its simplicity and effectiveness in aiding guitar learning.