# OneBookStore vs Khmer Math Formulas

The clearest difference is in-app purchases: Khmer Math Formulas at none against OneBookStore's 10. Khmer Math Formulas also leads on rating (4.3 vs 4.0) and review sentiment (100% vs 80%). OneBookStore's advantage is update cadence (every 2 months vs every 17 months). On price, ads and device support there is nothing between them.

Both are free to download. OneBookStore sells 10 one-off in-app purchases. Khmer Math Formulas asks for nothing beyond the download.

Khmer Math Formulas holds the better App Store score, 4.3 against 4.0. That said, the two scores are not equally well evidenced: Khmer Math Formulas has 6 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 80% of OneBookStore's written reviews are positive against 100% of Khmer Math Formulas's.

OneBookStore ships an update every 2 months, Khmer Math Formulas every 17 months. The most recent releases landed on September 24, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | OneBookStore | Khmer Math Formulas |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/onebookstore/id640553157/reviews) | **[4.3 (6 ratings)](https://appshunter.io/ios/app/khmer-math-formulas/id1073035289/reviews)** |
| Number of ratings | 1 | **6** |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 2 months** | Every 17 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 18 MB | 39 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 9+ | 4+ |
| Developer | [Sok Rotha](https://appshunter.io/developer/505856066) | [Cheab Kunthea](https://appshunter.io/developer/1073035288) |

## What reviewers say

### OneBookStore

[App page](https://appshunter.io/ios/app/onebookstore/id640553157)

Access a vast collection of free Cambodian literature, including novels, poems, magazines, and historical stories. This universal app supports iOS devices and offers gesture controls for managing your library.

**Highlights:** Free Cambodian literature access, Novels, poems, and magazines, Rare classic stories, Universal app support, Gesture controls for library management

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Katelok Part 2 Book | $0.99 | one-time |
| Folktales Part 1 | $0.99 | one-time |
| Folktales Part 2 Book | $0.99 | one-time |
| Folktales Part 3 Book | $0.99 | one-time |
| Folktales Part 4 Book | $0.99 | one-time |
| Folktales Part 6 Book | $0.99 | one-time |
| Folktales Part 5 Book | $0.99 | one-time |
| Choun Nath Philosophy | $1.99 | one-time |
| Neang 12 Story Book (Poem) | $2.99 | one-time |
| Neang 12 Story Book (Summary) | $2.99 | one-time |


### Khmer Math Formulas

[App page](https://appshunter.io/ios/app/khmer-math-formulas/id1073035289)

Access a comprehensive collection of math formulas for grades 7-12, designed with a simple and user-friendly interface. This app serves as a valuable study assistant for students, making it easy to browse and find the formulas you need.

**Highlights:** Grade 7-12 math formulas, Simple user interface, Easy formula browsing, Study assistant, Useful materials

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OneBookStore free?

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

### Is Khmer Math Formulas free?

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

### Which has better reviews, OneBookStore or Khmer Math Formulas?

Khmer Math Formulas is rated higher. OneBookStore averages 4.0 out of 5 from 1 ratings, while Khmer Math Formulas averages 4.3 from 6 ratings.

### Do OneBookStore or Khmer Math Formulas have ads?

Both OneBookStore and Khmer Math Formulas show ads.

### Which is updated more often, OneBookStore or Khmer Math Formulas?

OneBookStore ships an update every 2 months, and Khmer Math Formulas every 17 months. Most recently, OneBookStore was updated on September 24, 2026 and Khmer Math Formulas on October 17, 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.*