# OneBookStore vs Khmer Physic Formulas

The clearest difference is in-app purchases: Khmer Physic Formulas at none against OneBookStore's 10. Khmer Physic Formulas also leads on rating (4.4 vs 4.0) and ratings volume (15 vs 1). OneBookStore's advantage is review sentiment (80% vs 50%) and update cadence (every 2 months vs every 19 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 Physic Formulas asks for nothing beyond the download.

Khmer Physic Formulas holds the better App Store score, 4.4 against 4.0. That said, the two scores are not equally well evidenced: Khmer Physic Formulas has 15 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 80% of OneBookStore's written reviews are positive against 50% of Khmer Physic Formulas's, so the app with the better star average is not the one people write more warmly about.

OneBookStore ships an update every 2 months, Khmer Physic Formulas every 19 months. The most recent releases landed on September 24, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | OneBookStore | Khmer Physic Formulas |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/onebookstore/id640553157/reviews) | **[4.4 (15 ratings)](https://appshunter.io/ios/app/khmer-physic-formulas/id1076144702/reviews)** |
| Number of ratings | 1 | **15** |
| Positive reviews | **80.0% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 2 months** | Every 19 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 18 MB | 62 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 Physic Formulas

[App page](https://appshunter.io/ios/app/khmer-physic-formulas/id1076144702)

Access a comprehensive collection of physics formulas for various grade levels and specialized fields. This app offers a simple, fast, and smooth user interface for easy formula lookup.

**Highlights:** Physics formulas for grades 7-12, Engineering physics formulas, Basic physics formulas, SI Units and constants, Formula symbol reference, Simple and fast UI

**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 Physic Formulas free?

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

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

Khmer Physic Formulas is rated higher. OneBookStore averages 4.0 out of 5 from 1 ratings, while Khmer Physic Formulas averages 4.4 from 15 ratings.

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

Both OneBookStore and Khmer Physic Formulas show ads.

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

OneBookStore ships an update every 2 months, and Khmer Physic Formulas every 19 months. Most recently, OneBookStore was updated on September 24, 2026 and Khmer Physic Formulas on October 13, 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.*