Pocket Composer is primarily an assistant for music students professional composers and everyone who study music theory.
It has a complete dictionary with all existing chords and scales in western music.
This is a free app that contains also a compact chord progression builder
to help you create progressions and songs in every places where you cannot take the instrument.
It has a chord wheel that extends circle of fifths functionality and allows you harmonizing all scales and even apply harmony functions such as secondary dominant secondary leading tones secondary subdominants etc... so you can compose songs and learn to play chords and scales.

You can easily find out the name of an scale and the symbol of a chord by playing the instrument and even learn many other different chord symbols.

Main features:

. All existing piano chords with it's inversion and different voicings.
. All existing scales and many of it's different names.
. Extended chord Wheel and Circle of Fifths.
. Compact chord progression builder.
. List of all available chords in scales grouped by number of notes
. Many different key notations: English Spanish Italian German Japanese Russian Chinese numerical etc.
. Chord-Scale Theory to learn how to apply scales over single chords
. Chord voicings and inversions
. Scales on the staff with many different clef.