Scaler 3

Scaler, from Plugin Boutique, is a chord and harmony plugin used by producers who want great progressions without deep theory training. Version 3 offers more than 1,000 chord sets by genre and mood, detects chords and keys from MIDI or audio, and generates melodies, basslines and arpeggios through its Motions. It can host your own instruments, control several tracks at once, build song sections with Scenes, and suggest key changes. It's rule- and data-driven rather than generative AI, but it's a staple of assisted songwriting.