# OSUN2 vs Buddy for KAIST

The clearest difference is update cadence: Buddy for KAIST at every 3 weeks against OSUN2's every 28 months. OSUN2's advantage is iOS requirement (9.0 vs 26.1). 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.

OSUN2 ships an update every 28 months, Buddy for KAIST every 3 weeks. The most recent releases landed on October 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | OSUN2 | Buddy for KAIST |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 28 months | **Every 3 weeks** |
| Size | 20 MB | 61 MB |
| Requires iOS | **9.0** | 26.1 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [ShenZhen YOUNG WIN Technology Co., Ltd.](https://appshunter.io/developer/1405507279) | [SPARCS](https://appshunter.io/developer/1687472027) |

## What reviewers say

### OSUN2

[App page](https://appshunter.io/ios/app/osun2/id1504606789)

**Features:** macOS Compatibility

**In-app purchases:** none


### Buddy for KAIST

[App page](https://appshunter.io/ios/app/buddy-for-kaist/id6749929416)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is OSUN2 free?

OSUN2 is free to download, with no in-app purchases.

### Is Buddy for KAIST free?

Buddy for KAIST is free to download, with no in-app purchases.

### Do OSUN2 or Buddy for KAIST have ads?

Neither OSUN2 nor Buddy for KAIST shows ads.

### Which is updated more often, OSUN2 or Buddy for KAIST?

OSUN2 ships an update every 28 months, and Buddy for KAIST every 3 weeks. Most recently, OSUN2 was updated on October 3, 2026 and Buddy for KAIST on October 30, 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.*