# 세심(sesim) vs ONE

The clearest difference is update cadence: ONE at every 2 weeks against 세심(sesim)'s every 4 months. 세심(sesim)'s advantage is device support (3 vs 1) and iOS requirement (15.1 vs 17.0). On price, ads 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.

세심(sesim) ships an update every 4 months, ONE every 2 weeks. The most recent releases landed on October 18, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | 세심(sesim) | ONE |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Size | 27 MB | 2 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Mirae Jin](https://appshunter.io/developer/1892761433) | [骋飞 武](https://appshunter.io/developer/6775319022) |

## What reviewers say

### 세심(sesim)

[App page](https://appshunter.io/ios/app/sesim/id6769962605)

**Features:** macOS Compatibility

**In-app purchases:** none


### ONE

[App page](https://appshunter.io/ios/app/one-focus-deep-life-timer/id6777599934)

**In-app purchases:** none


## Frequently asked questions

### Is 세심(sesim) free?

세심(sesim) is free to download, with no in-app purchases.

### Is ONE free?

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

### Do 세심(sesim) or ONE have ads?

Neither 세심(sesim) nor ONE shows ads.

### Which is updated more often, 세심(sesim) or ONE?

세심(sesim) ships an update every 4 months, and ONE every 2 weeks. Most recently, 세심(sesim) was updated on October 18, 2026 and ONE on October 28, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*