ChordButter is a songwriting and demo-sketching app for iOS, iPadOS, and macOS aimed at songwriters, producers, and musicians who want to capture ideas quickly. The app centers around key-based chord and melody exploration, enabling users to experiment with chord progressions and melodic ideas within a clear harmonic context.

Alongside chord-based workflows, ChordButter includes a melody editor that allows users to create and adjust melodies in relation to their chord progressions, or to derive chords from an existing melody.

ChordButter also offers a simplified studio environment for sketching song demos, as well as an integrated lyrics notepad for capturing text ideas alongside music. Built-in reference instruments such as piano and guitar provide visual guidance, while Core MIDI support enables connection to external hardware and software.

MIDI and text export make it easy to transfer ideas into a DAW or continue working on songs in other environments. ChordButter is designed for developing song ideas on the go, without requiring a physical instrument or complex setup.