# Diatonic Chords by Key — Popular chord progressions Pro

> Popular chord progressions Pro (iPhone/iPad app by Mateus Polonini Cardoso.)

- Source: https://appshunter.io/ios/app/diatonic-chords-by-key/id1533977611 (this page in markdown: same URL + `.md`)
- Developer: [Mateus Polonini Cardoso](https://appshunter.io/developer/1530866903)
- Category: Music, Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 13.6 · 36 MB
- Languages: Arabic, Bulgarian, Croatian, Czech, Danish, Dutch, English, Finnish, French, German and 29 more
- Released: 2026-07-22
- Data updated: 2026-07-31
- User reviews in markdown: https://appshunter.io/ios/app/diatonic-chords-by-key/id1533977611/reviews.md

## What is Diatonic Chords by Key?

Key Chords turns music theory into chord shapes you can use. Explore the seven diatonic chords in major and natural minor keys, compare positions for guitar, ukulele, and Brazilian viola caipira, and keep a practical reference close while you practice or write.

Explore chords by key
• Choose a major or minor key and see its seven scale degrees with the matching chords.
• Switch instruments to view the available shapes for guitar, ukulele, or viola caipira.
• Save chord diagrams and diatonic chord sets as favorites on your device.
• For guitar and viola caipira, choose to show an easier no-barre shape first when one is available.

Find the shape you need
Search the chord dictionary by symbol, instrument, or chord quality. Open a chord to compare the available fingering variations and use the clear diagrams as a quick reference during study or practice.

Practice chord progressions
Explore five familiar patterns, including I–V–vi–IV, ii–V–I, and I–IV–V, in different keys. Use them to practice changes, understand harmonic movement, or try ideas for your own music.

Whether you are learning music theory, practicing chord shapes, or sketching a progression, Key Chords helps connect keys, degrees, and playable chords in one focused study tool.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Campo Harmônico Pro | $2.99 | one-time |



## Version history (last 2 releases)

### 3.0.1 — 2026-07-27

Campo Harmônico Pro: Popular chord progressions. Choose a tool to study.

### 3.0 — 2026-07-22

No release notes.

## More apps by Mateus Polonini Cardoso

- [Ritmos Guitar](https://appshunter.io/ios/app/ritmos-guitar/id1532049481)
- [46 Batidas de ukulele](https://appshunter.io/ios/app/46-batidas-de-ukulele/id1544669338)
- [31 dedilhados no ukulele](https://appshunter.io/ios/app/31-dedilhados-no-ukulele/id1569511964)
- [Pedal Cifras](https://appshunter.io/ios/app/pedal-cifras/id6760982665)
- [Audio RTA Analyzer](https://appshunter.io/ios/app/audio-rta-analyzer/id6784479397)

All apps by Mateus Polonini Cardoso: https://appshunter.io/developer/1530866903

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-31.*