Harmonaut
Chord Progression Playground
Free · Designed for iPad. Not verified for macOS.
Play chord progressions intuitively — no wrong notes, theory encouraged not required. Add tension, shift the mood; every chord flows into the next. It just sounds right.
Harmonaut is a chord instrument you play by feel.
Press a key and it voices a rich chord for the moment — no theory, no wrong notes. Two faders let you shape the mood as you play: more tension or less, brighter or darker, even major to minor.
Chase a moody electronic progression, a warm lo-fi loop, a cinematic swell, or a simple pop hook — it all comes from your intent, not from naming chords.
HOW IT PLAYS
• Tension that actually resolves — chords that lean, pull home, and land, so your progression goes somewhere instead of just floating
• Every one of the twelve keys is in play — reach past the obvious chords for richer, more surprising color, and it still sounds right
• Build a whole progression, not just four chords — every chord you play lands in your trail, ready to reorder or duplicate to try new versions in seconds
• Pick up right where you left off — your ideas are saved for you
IT SOUNDS GOOD FOR A REASON
Harmonaut connects your chords with smooth voice leading, so a progression flows instead of clunking — that finished feeling you hear in the songs you love. And it names every chord the way musicians actually write it — Ebmaj7 — so you can hand your progression to a session player, a bandmate, or a producer and they'll read it and play it back exactly, first time — no re-explaining. You're speaking their language without having to learn it. And because it's built on how harmony really works — not a random generator — every chord it hands you genuinely works. However much theory you know, it just sounds right.
No box to buy, nothing to charge, no menus to dig through — it's already in your pocket.
Whether it's your first progression or a sound you can hear but can't name, Harmonaut meets you where you are.
See the end user license agreement at the following link:
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
The developer, District One Mobile, LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- District One Mobile, LLC
- Size
- 122.8 MB
- Category
- Music
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 District One Mobile, LLC