# InvaZium vs Board & Book

The clearest difference is in-app purchases: InvaZium at none against Board & Book's 1. InvaZium also leads on device support (3 vs 1) and iOS requirement (12.0 vs 18.6). On price, update cadence and ads there is nothing between them.

Both are free to download. Board & Book sells 1 one-off in-app purchase. InvaZium asks for nothing beyond the download.

InvaZium ships an update every 6 days, Board & Book every 3 days. The most recent releases landed on October 7, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | InvaZium | Board & Book |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/board-and-book/id6760626518/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 days | **Every 3 days** |
| Monetization | — | Free with in-app purchases |
| Size | 54 MB | 63 MB |
| Requires iOS | **12.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Daniel Canete Campos](https://appshunter.io/developer/1273575992) | [ROBERT CHARLES KREHBIEL](https://appshunter.io/developer/1885391895) |

## What reviewers say

### InvaZium

[App page](https://appshunter.io/ios/app/invazium/id6480328706)

**Features:** macOS Compatibility

**In-app purchases:** none


### Board & Book

[App page](https://appshunter.io/ios/app/board-and-book/id6760626518)

This app combines chess with literary exploration, allowing users to delve into the history of the game through curated stories. It offers tactical training and various play modes, including online matches with friends.

**Highlights:** Chess history narratives, Tactical training, Play against computer, Online play with friends, Full library unlock

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Board & Book Premium | $4.99 | one-time |


## Frequently asked questions

### Is InvaZium free?

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

### Is Board & Book free?

Board & Book is free to download, with in-app purchases available.

### Do InvaZium or Board & Book have ads?

Neither InvaZium nor Board & Book shows ads.

### Which is updated more often, InvaZium or Board & Book?

InvaZium ships an update every 6 days, and Board & Book every 3 days. Most recently, InvaZium was updated on October 7, 2026 and Board & Book on October 14, 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.*