# do!bookⅡ vs SL Neo

The clearest difference is device support: do!bookⅡ at 3 against SL Neo's 1. do!bookⅡ also leads on iOS requirement (9.0 vs 11.0). On price, update cadence, ads and in-app purchases there is nothing between them.

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

do!bookⅡ ships an update every 2 months, SL Neo every 5 weeks. The most recent releases landed on September 14, 2026 and December 19, 2025 respectively.

## The numbers

| Metric | do!bookⅡ | SL Neo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Size | 21 MB | 113 MB |
| Requires iOS | **9.0** | 11.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Digital Office  Japan  Inc.](https://appshunter.io/developer/348581782) | [Kissei Comtec Co., Ltd.](https://appshunter.io/developer/503794772) |

## What reviewers say

### do!bookⅡ

[App page](https://appshunter.io/ios/app/dobook/id599472647)

**Features:** macOS Compatibility

**In-app purchases:** none


### SL Neo

[App page](https://appshunter.io/ios/app/sl-neo/id1449947923)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is do!bookⅡ free?

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

### Is SL Neo free?

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

### Do do!bookⅡ or SL Neo have ads?

Neither do!bookⅡ nor SL Neo shows ads.

### Which is updated more often, do!bookⅡ or SL Neo?

do!bookⅡ ships an update every 2 months, and SL Neo every 5 weeks. Most recently, do!bookⅡ was updated on September 14, 2026 and SL Neo on December 19, 2025.

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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.*