# do!book vs XactiViewer

The clearest difference is update cadence: XactiViewer at weekly against do!book's every 2 months. do!book's advantage is iOS requirement (9.0 vs 17.0). 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.

do!book ships an update every 2 months, XactiViewer weekly. The most recent releases landed on September 9, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | do!book | XactiViewer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Size | 5 MB | 142 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Digital Office  Japan  Inc.](https://appshunter.io/developer/348581782) | [株式会社ザクティ](https://appshunter.io/developer/1531663195) |

## What reviewers say

### do!book

[App page](https://appshunter.io/ios/app/dobook/id1459068800)

**Features:** macOS Compatibility

**In-app purchases:** none


### XactiViewer

[App page](https://appshunter.io/ios/app/xactiviewer/id1531663193)

**In-app purchases:** none


## Frequently asked questions

### Is do!book free?

do!book is free to download, with no in-app purchases.

### Is XactiViewer free?

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

### Do do!book or XactiViewer have ads?

Neither do!book nor XactiViewer shows ads.

### Which is updated more often, do!book or XactiViewer?

do!book ships an update every 2 months, and XactiViewer weekly. Most recently, do!book was updated on September 9, 2026 and XactiViewer on September 24, 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.*