ZZZ FretHarmony
Chords and scales on the neck
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Learn a chord where you play it: on the neck.
A guitar practice app that draws the relationship between chords and scales on the neck itself.
■ The whole neck, drawn
Chord tones, scale tones, extensions and avoid notes, muted and open strings — each told apart by colour and shape. Switch to degrees and a shape becomes the same shape in every key.
■ Every fingering a chord has
From the chord book anyone learns first to every position on every run of adjacent strings. Choose by which string the root is on, and narrow it down by arrangement: close, drop 2, drop 3, shell, power chord.
■ Progressions written in degrees
Diatonic or not, a progression is built from degrees. Change the key and the whole thing transposes; change key part way through and it modulates. Start from a preset or from nothing at all.
■ Arpeggios with a rhythm of their own
Not only up and down: three-finger and Travis-style patterns that have a rhythm in them, and a different pattern for each bar if you want one.
■ Eight recorded instruments
Electric, acoustic and nylon-string guitar, piano, organ, harp, cello and flute — each note pitch-corrected one at a time. A synthesised string is there too.
■ More than thirty scales
Every mode of the major and minor scales, pentatonics, both blues scales, bebop, whole tone, diminished, altered, Hungarian minor, and the Japanese scales: hirajoshi, in sen, yo and ryukyu.
■ It all stays on your device
No account, no sign-in. Settings and saved progressions live on the device only, and nothing about what you play is sent anywhere.
On a tablet the neck stays visible while you work; on a phone it stays pinned while the controls scroll under it.
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ZZZ FretHarmony Pro (auto-renewing subscription)
- Length and price: 1 year / ¥360
- What it does: hides every advert and removes the limit on saved progressions
- Renews every year unless cancelled at least 24 hours before the period ends
- Cancel any time in your App Store account settings; cancelling takes effect at
the end of the period already paid for
Terms of Use (EULA):
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy:
https://smolt-stage.com/home/privacy/zzz-fretharmony-privacy-policy-ios-en.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, SMOLT STAGE, K.K., 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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Location
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- SMOLT STAGE, K.K.
- Size
- 29.1 MB
- Category
- Music
- Compatibility
Requires iOS 16.3 or later.
- iPhone
Requires iOS 16.3 or later. - iPad
Requires iPadOS 16.3 or later. - Mac
Requires macOS 13.2 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- ZZZ FretHarmony Pro $1.99
- Copyright
- © 2026 SMOLT STAGE, K.K.