# Primary Chinese Book 4B vs langur

The clearest difference is ads: langur at none against Primary Chinese Book 4B's shown. langur also leads on update cadence (weekly vs every 2 months). Primary Chinese Book 4B's advantage is iOS requirement (10.0 vs 13.4). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Primary Chinese Book 4B sells 1 one-off in-app purchase and langur sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Primary Chinese Book 4B ships an update every 2 months, langur weekly. The most recent releases landed on October 3, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Primary Chinese Book 4B | langur |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Weekly** |
| Size | 177 MB | 66 MB |
| Requires iOS | **10.0** | 13.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [永新 章](https://appshunter.io/developer/1381296494) | [Grégory Ho Tin Noé](https://appshunter.io/developer/1716569276) |

## What reviewers say

### Primary Chinese Book 4B

[App page](https://appshunter.io/ios/app/primary-chinese-book-4b/id1503667180)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 小学语文四年级下册,功能提升 | $2.99 | one-time |


### langur

[App page](https://appshunter.io/ios/app/langur/id6472059778)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Langur Monthly Subscription | $0.99 | per month |
| Langur Yearly Subscription | $9.99 | per year |


## Frequently asked questions

### Is Primary Chinese Book 4B free?

Primary Chinese Book 4B is free to download, with in-app purchases available.

### Is langur free?

langur is free to download, with in-app purchases available.

### Do Primary Chinese Book 4B or langur have ads?

Primary Chinese Book 4B shows ads; langur does not.

### Which is updated more often, Primary Chinese Book 4B or langur?

Primary Chinese Book 4B ships an update every 2 months, and langur weekly. Most recently, Primary Chinese Book 4B was updated on October 3, 2026 and langur on October 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.*