RapidComposer is a music prototyping software crafted for composers, songwriters, and musicians across all genres. It offers a unique, non-destructive phrase-based composition approach that allows users to create, edit, and arrange musical ideas efficiently. The software includes advanced tools for phrase editing, morphing, generation, and grouping, enabling the development of motifs and chord progressions with ease. Its timeline integrates chords in absolute or functional forms, ensuring all phrases automatically adapt to the harmonic context.

This software features a piano roll with scale notes and visually editable chord notes that intelligently arrange overlapping notes in two styles. Users can perform detailed phrase-level and note-level editing without losing original material. A comprehensive set of tools supports melody generation, harmonization, sophisticated MIDI CC editing, and articulation assignment to both phrases and individual notes. Extensive databases include scales, chords, guitar chords, and chord progressions, while phrase and rhythm generators create musically coherent material rather than random sequences.

RapidComposer also offers a taggable instrument library consolidating MIDI, VST/VST3, and SoundFont presets in one place. The IdeaTool generates multitrack compositions based on user-defined parameters and rules. Its drag-and-drop interface simplifies arranging chords, phrases, and instruments within compositions. With full support for virtual instruments and effects, unlimited undo, customizable UI themes, and compatibility as both standalone and plug-in versions on Windows and macOS (including Apple Silicon), it provides a powerful and flexible environment for music creation.