# ReadGrow vs Book Light 書光光

The clearest difference is in-app purchases: ReadGrow at none against Book Light 書光光's 1. ReadGrow also leads on update cadence (every 4 days vs every 9 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Book Light 書光光 sells 1 one-off in-app purchase. ReadGrow asks for nothing beyond the download.

ReadGrow ships an update every 4 days, Book Light 書光光 every 9 days. The most recent releases landed on October 1, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | ReadGrow | Book Light 書光光 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 9 days |
| Size | 17 MB | 84 MB |
| Requires iOS | 16.0 | **15.5** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Chih-Yen Kuo](https://appshunter.io/developer/6783488735) | [Cheuk Yan Law](https://appshunter.io/developer/1861303384) |

## What reviewers say

### ReadGrow

[App page](https://appshunter.io/ios/app/readgrow/id6783488733)

**In-app purchases:** none


### Book Light 書光光

[App page](https://appshunter.io/ios/app/book-light/id6809764007)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 請我食燒賣 | $1.99 | one-time |


## Frequently asked questions

### Is ReadGrow free?

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

### Is Book Light 書光光 free?

Book Light 書光光 is free to download, with in-app purchases available.

### Do ReadGrow or Book Light 書光光 have ads?

Neither ReadGrow nor Book Light 書光光 shows ads.

### Which is updated more often, ReadGrow or Book Light 書光光?

ReadGrow ships an update every 4 days, and Book Light 書光光 every 9 days. Most recently, ReadGrow was updated on October 1, 2026 and Book Light 書光光 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.*