# PNO Book vs Opus

The clearest difference is in-app purchases: PNO Book at none against Opus's 2. PNO Book also leads on iOS requirement (14.0.0 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Opus sells 2 in-app purchases, starting at $5.99 per month. PNO Book asks for nothing beyond the download.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | PNO Book | Opus |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Size | 58 MB | 130 MB |
| Requires iOS | **14.0.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Reginald Watkins](https://appshunter.io/developer/1774881490) | [Cyberic Limited](https://appshunter.io/developer/1874822564) |

## 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


### Opus

[App page](https://appshunter.io/ios/app/opus-classical-music-guide/id6758754835)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $5.99 | per month |
| Annual | $49.99 | per year |


## Frequently asked questions

### Is PNO Book free?

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

### Is Opus free?

Opus is free to download, with in-app purchases available.

### Do PNO Book or Opus have ads?

Neither PNO Book nor Opus shows ads.

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

PNO Book ships an update weekly, and Opus weekly. Most recently, PNO Book was updated on October 30, 2026 and Opus on October 31, 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.*