# Doongsil vs Focus One

The clearest difference is in-app purchases: Focus One at none against Doongsil's 1. Focus One also leads on update cadence (every 2 weeks vs every 11 months). Doongsil's advantage is iOS requirement (15.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Doongsil sells 1 one-off in-app purchase. Focus One asks for nothing beyond the download.

Doongsil ships an update every 11 months, Focus One every 2 weeks. The most recent releases landed on October 17, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Doongsil | Focus One |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 11 months | **Every 2 weeks** |
| Size | 42 MB | 6 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Minseok Song](https://appshunter.io/developer/1680507122) | [BYNET](https://appshunter.io/developer/1811735131) |

## What reviewers say

### Doongsil

[App page](https://appshunter.io/ios/app/doongsil/id6478134949)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Doongsil Pro | $3.99 | one-time |


### Focus One

[App page](https://appshunter.io/ios/app/focus-one-adhd-and-focus-timer/id6756911974)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Doongsil free?

Doongsil is free to download, with in-app purchases available.

### Is Focus One free?

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

### Do Doongsil or Focus One have ads?

Both Doongsil and Focus One show ads.

### Which is updated more often, Doongsil or Focus One?

Doongsil ships an update every 11 months, and Focus One every 2 weeks. Most recently, Doongsil was updated on October 17, 2026 and Focus One on October 15, 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.*