One Voice. Full Harmonies.
Harmony Engine is a real-time vocal harmony plugin that lets you produce professional quality harmony arrangements from a single vocal or monophonic instrument track.
Key Features
Pro Harmonies From a Single Source
Four Independently Adjustable Harmony Voices
Humanize Controls for Natural Performances
Arrange Notes Manually or Automatically
Compatible with AutoKey 2 and AutoKey Mobile
Secret Weapon of the Pros
Harmony Engine, a favorite vocal effect heard on records from Billie Eilish, Diplo, Lady Gaga, HAIM, and more, makes it easy to add lush harmonies to your vocal tracks.
Harmonies as Unique as You
Use up to 4 voices in any given key, each with its own unique timbre, vibrato, panning, and octaves, giving you full control of each individual harmony.
Harmony of One
Produce professional-quality harmony arrangements from a single vocal, or experiment with monophonic instrument tracks to create new sounds.
A Creative Choir
With our impressive built-in Choir technology, you can enrich all 4 harmonies with 2, 4, 8, or even 16 voices. Customize them further using individual timbre, vibrato and stereo spread controls.
Handmade Harmonies
Meticulously craft your own vocal arrangement note-by-note, perform your harmonies with your MIDI controller, or simply choose the chords and let Harmony Engine do the rest.
Plays Well with Others
Harmony Engine is compatible with every major DAW and seamlessly integrates with AutoKey 2 and AutoKey Mobile, which means you'll never worry about finding the key, scale, or tempo of your music again.
Go to tech specs →
What People Are Saying
Harmony Engine feels like playing a piano made out of the human voice. The nuance and texture of it is so rich that it brings any production to life.
FINNEAS
Artist, Songwriter, Producer
Billie Eilish, FINNEAS
Harmony Engine is great for coming up with harmony parts and ideas on the fly—and it’s an easy way to fatten up any chorus.
Robert Venable
Producer, Mixer, Engineer
Twenty One Pilots, Kelly Clarkson, Megadeth
I’m a huge fan of Harmony Engine. It’s a great thickening tool—and sounds great too.
Ben Baptie
Engineer, Mixer
Lady Gaga, The Strokes, Cage The Elephant
Adding Harmony Engine to vocals sounds amazing.
Durante
Producer, DJ
Diplo, Aluna AlunaGeorge
Harmony Engine is a great tool for inspiration even within a mix session. Try it on a lead guitar and thank me later!
Preston "Prizzie" Reid
Engineer, Mixer
Kanye West, Muni Long, Omah Lay
I have found Harmony Engine to be a genius tool on many things other than just vocals.
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Get everything we make including our newest plugins: AutoTune 2026 and Metamorph.