# UBio vs Sungong

The clearest difference is update cadence: Sungong at every 11 days against UBio's every 21 months. UBio's advantage is iOS requirement (15.6 vs 17.0). On price and in-app purchases there is nothing between them.

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

UBio ships an update every 21 months, Sungong every 11 days. The most recent releases landed on September 18, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | UBio | Sungong |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | — | Yes |
| Update frequency | Every 21 months | **Every 11 days** |
| Size | 40 MB | 51 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | — | **iPhone** |
| Age rating | 4+ | 4+ |
| Developer | [UNION biometrics Co., Ltd.](https://appshunter.io/developer/937089081) | [joonseo park](https://appshunter.io/developer/1265149051) |

## What reviewers say

### UBio

[App page](https://appshunter.io/ios/app/ubio-xkey/id6504510418)

**In-app purchases:** none


### Sungong

[App page](https://appshunter.io/ios/app/sungong-pomodoro-study-timer/id6776498059)

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

**In-app purchases:** none


## Frequently asked questions

### Is UBio free?

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

### Is Sungong free?

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

### Which is updated more often, UBio or Sungong?

UBio ships an update every 21 months, and Sungong every 11 days. Most recently, UBio was updated on September 18, 2026 and Sungong on September 12, 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.*