# PNO Book vs ChordDeck

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.

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.

## The numbers

| Metric | PNO Book | ChordDeck |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/chorddeck/id6767094987/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | — | Paid |
| Size | 58 MB | 4 MB |
| Requires iOS | **14.0.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Reginald Watkins](https://appshunter.io/developer/1774881490) | [Shinhye Lee](https://appshunter.io/developer/1707333313) |

## What reviewers say

### PNO Book

[App page](https://appshunter.io/ios/app/pno-book/id6743553403)

**Features:** macOS Compatibility, Apple Wallet, Vision Pro support

**In-app purchases:** none


### ChordDeck

[App page](https://appshunter.io/ios/app/chorddeck/id6767094987)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PNO Book free?

PNO Book is free to download, with no in-app purchases.

### Is ChordDeck free?

ChordDeck costs $0.99, with no in-app purchases.

### Do PNO Book or ChordDeck have ads?

Neither PNO Book nor ChordDeck shows ads.

### Which is updated more often, PNO Book or ChordDeck?

PNO Book ships an update weekly, and ChordDeck weekly. Most recently, PNO Book was updated on October 11, 2026 and ChordDeck on September 29, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*