# Khmer Knowledge vs Rocket English

The clearest difference is in-app purchases: Khmer Knowledge at none against Rocket English's 1. Khmer Knowledge also leads on ads (none vs shown) and update cadence (every 3 months vs every 12 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Rocket English sells 1 one-off in-app purchase. Khmer Knowledge asks for nothing beyond the download.

Khmer Knowledge ships an update every 3 months, Rocket English every 12 months. The most recent releases landed on September 10, 2026 and September 5, 2026 respectively.

## The numbers

| Metric | Khmer Knowledge | Rocket English |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 months** | Every 12 months |
| Size | 15 MB | 13 MB |
| Requires iOS | **13.0** | 14.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Socheat Leng](https://appshunter.io/developer/1528841743) | [SHINGO MATSUO](https://appshunter.io/developer/1493414113) |

## What reviewers say

### Khmer Knowledge

[App page](https://appshunter.io/ios/app/khmer-knowledge/id1488126790)

**In-app purchases:** none


### Rocket English

[App page](https://appshunter.io/ios/app/rocket-english/id6740396151)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |


## Frequently asked questions

### Is Khmer Knowledge free?

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

### Is Rocket English free?

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

### Do Khmer Knowledge or Rocket English have ads?

Rocket English shows ads; Khmer Knowledge does not.

### Which is updated more often, Khmer Knowledge or Rocket English?

Khmer Knowledge ships an update every 3 months, and Rocket English every 12 months. Most recently, Khmer Knowledge was updated on September 10, 2026 and Rocket English on September 5, 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.*