SUS4 Chord ID
Name the chord you're hearing.
Free · In‑App Purchases
Play any chord into your mic. SUS4 Chord ID names it and shows the voicings. On-device, always.
What chord is that? Now you know.
Play a chord, and SUS4 Chord ID names it. Hold a guitar chord up to the mic, play a few notes into the app's built-in keyboard, and the app returns the chord name and a set of common voicings on guitar and piano. It handles basic major and minor triads just as cleanly as it handles extended jazz chords and ambiguous slash chords.
The history tab keeps a log of every chord you have identified, with optional notes so you can annotate as you go. Useful for writing sessions where you are building a progression and want a record of what you played, and useful for theory study when you want to understand what you are hearing.
• Mic-based chord detection — play it in; the app names it
• Built-in keyboard for manual input
• Chord name display with common voicing diagrams
• Supports simple triads through extended and altered jazz chords
• Identification history with optional notes per entry
• Subscribe monthly, or unlock the full SUS4 suite forever: unlimited identifications, voicing diagrams for common chords, and annotated history
All audio analysis runs on your device. Your music stays private.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Lifetime purchase option and reliability improvements.
The developer, ThePaulSmith, 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 Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Paul Smith
- Size
- 21.2 MB
- Category
- Music
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - iPad
Requires iPadOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- SUS4 All-Access $4.99
- SUS4 Chord ID Pro Monthly $2.99
- SUS4 Chord ID Lifetime $29.99
- Copyright
- © 2026 4chords Studios