# Rule Book UBTZ vs Open Library Reader

The clearest difference is update cadence: Open Library Reader at every 2 months against Rule Book UBTZ's every 4 months. Rule Book UBTZ's advantage is iOS requirement (8.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Rule Book UBTZ ships an update every 4 months, Open Library Reader every 2 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Rule Book UBTZ | Open Library Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.1 (51 ratings)](https://appshunter.io/ios/app/open-library-reader/id1573989409/reviews)** |
| Number of ratings | — | **51** |
| Positive reviews | — | 26.2% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | — | Free |
| Size | 27 MB | 24 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [veritech](https://appshunter.io/developer/1044574972) | [Loomis House, LLC](https://appshunter.io/developer/1573989411) |

## What reviewers say

### Rule Book UBTZ

[App page](https://appshunter.io/ios/app/rule-book-ubtz/id1125251709)

**In-app purchases:** none


### Open Library Reader

[App page](https://appshunter.io/ios/app/open-library-reader/id1573989409)

Access and read millions of books from an online library. Organize your reading lists, track borrowed books, and discover related titles within a familiar reading interface. Requires an internet connection.

**Highlights:** Browse and check out millions of books, Track reading progress and wishlists, Built-in search and related title discovery, Shelf management and edition changes, Checkout tracking for borrowed books, Customizable reading interface

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

**In-app purchases:** none


## Frequently asked questions

### Is Rule Book UBTZ free?

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

### Is Open Library Reader free?

Open Library Reader is free to download, with no in-app purchases.

### Do Rule Book UBTZ or Open Library Reader have ads?

Neither Rule Book UBTZ nor Open Library Reader shows ads.

### Which is updated more often, Rule Book UBTZ or Open Library Reader?

Rule Book UBTZ ships an update every 4 months, and Open Library Reader every 2 months. Most recently, Rule Book UBTZ was updated on November 2, 2026 and Open Library Reader on November 3, 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.*