# Okuma ABook vs Chris Mart

The clearest difference is update cadence: Chris Mart at every 3 weeks against Okuma ABook's every 13 months. Okuma ABook's advantage is iOS requirement (12.0 vs 15.1). 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.

Okuma ABook ships an update every 13 months, Chris Mart every 3 weeks. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Okuma ABook | Chris Mart |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 3 weeks** |
| Size | 17 MB | 370 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Okuma Corporation](https://appshunter.io/developer/922363675) | [BORDERS Co., Ltd](https://appshunter.io/developer/1828883290) |

## What reviewers say

### Okuma ABook

[App page](https://appshunter.io/ios/app/okuma-abook/id922363676)

**Features:** macOS Compatibility

**In-app purchases:** none


### Chris Mart

[App page](https://appshunter.io/ios/app/chris-mart/id6749140170)

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

**In-app purchases:** none


## Frequently asked questions

### Is Okuma ABook free?

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

### Is Chris Mart free?

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

### Do Okuma ABook or Chris Mart have ads?

Neither Okuma ABook nor Chris Mart shows ads.

### Which is updated more often, Okuma ABook or Chris Mart?

Okuma ABook ships an update every 13 months, and Chris Mart every 3 weeks. Most recently, Okuma ABook was updated on October 26, 2026 and Chris Mart on October 28, 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.*