# Chakra STEM vs Preap Sar

The clearest difference is update cadence: Preap Sar at every 2 days against Chakra STEM's monthly. Chakra STEM's advantage is iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Chakra STEM ships an update monthly, Preap Sar every 2 days. The most recent releases landed on October 25, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Chakra STEM | Preap Sar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/preap-sar/id6786569512/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | — | Free with in-app purchases |
| Size | 57 MB | 93 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Ministry of Environment Cambodia](https://appshunter.io/developer/1727580743) | [Savun Cheam](https://appshunter.io/developer/6786569514) |

## What reviewers say

### Chakra STEM

[App page](https://appshunter.io/ios/app/chakra-stem/id6504170842)

**Features:** macOS Compatibility

**In-app purchases:** none


### Preap Sar

[App page](https://appshunter.io/ios/app/preap-sar/id6786569512)

A private messaging application offering secure 1:1 and group chats with rich media support. It also includes voice and video calls, identity key backups, and features for connecting with others. Additional tools like personal notes, task management, and a business listing service are also available.

**Highlights:** End-to-end encrypted messaging, Voice and video calls, Group and 1:1 chats, File and media sharing, Personal notes and tasks, Business listing and ordering

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

**In-app purchases:** none


## Frequently asked questions

### Is Chakra STEM free?

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

### Is Preap Sar free?

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

### Do Chakra STEM or Preap Sar have ads?

Neither Chakra STEM nor Preap Sar shows ads.

### Which is updated more often, Chakra STEM or Preap Sar?

Chakra STEM ships an update monthly, and Preap Sar every 2 days. Most recently, Chakra STEM was updated on October 25, 2026 and Preap Sar on October 19, 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.*