PNO Book vs ChordDeck
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PNO Book
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PNO Books is an ever-growing collection of chord progression books designed for musicians who love learning by ear and enjoy discovering new sounds. Whether you're looking for progressions inspired by specific songs, genres, or artists—or want to explore unique piano theory insights—PNO Books makes it easy. Each book includes clear, highlighted chords and accompanying video lessons, giving you a visual and practical way to bring progressions to life on the keys. Perfect for Pianists Who: Learn best by ear and love experimenting with new sounds Enjoy learning from YouTube but want structured, ready-to-play progressions Want fresh chord ideas inspired by real music to spark creativity Prefer a no-fluff, straight-to-the-point approach to playing With new books and videos added regularly, PNO Books is your go-to resource for expanding your chord vocabulary and refining your sound. Download now and start playing!
ChordDeck
This app provides jazz chord flashcards for musicians to practice chord recall. It displays chord symbols, tones, formulas, and keyboard highlights, with audio playback. Users can mark difficult cards for later review.
- Practice jazz chord qualities
- Circle-of-fourths or random root order
- Continuous or one-pass practice sessions
- View chord tones, formulas, and keyboard highlights
- Built-in audio playback
- Mark and review difficult cards
- Local storage for settings and marked cards
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ChordDeck is a compact flashcard app for practicing jazz chord recall. Choose the roots and chord qualities you want to drill, then move through a focused deck one card at a time. Each card starts with a chord symbol so you can recall the answer mentally or on your instrument before revealing the details. Reveal a card to check the chord tones, a short formula, a compact piano keyboard highlight, and built-in audio playback. Mark difficult cards during practice and review them again later from the first screen. ChordDeck is designed for musicians who already know basic chord concepts and want a fast, repeatable way to build fluency. It keeps practice visual and direct instead of turning each session into a lesson page. Features: - Practice common jazz chord qualities across selected roots. - Follow circle-of-fourths root order or use random card order. - Choose one-pass sessions or continuous practice. - Reveal chord tones, formulas, and compact keyboard highlights. - Hear chord tones followed by the full chord. - Mark difficult cards and review them in a focused deck. - Use swipe navigation, previous and next controls, and timed autoplay. - Keep practice settings and marked cards stored locally on your device. ChordDeck is useful for jazz students, pianists, guitarists, bassists, arrangers, and other musicians who want quicker recognition of chord symbols, tones, and formulas.
Screenshots
Verdict
The clearest difference is price: PNO Book at Free against ChordDeck's $0.99. PNO Book also leads on iOS requirement (14.0.0 vs 17.0). On update cadence, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
PNO Book is free to download; ChordDeck costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 11, 2026 and September 29, 2026 respectively.
| Parameter | PNO Book | ChordDeck |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Weekly | Weekly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 58 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Reginald Watkins | Shinhye Lee |
In-app purchases
PNO Book
No in-app purchases
ChordDeck
No in-app purchases









