# Doongsil vs Focus Aquarium

The clearest difference is ads: Focus Aquarium at none against Doongsil's shown. Focus Aquarium also leads on update cadence (fortnightly vs every 11 months). Doongsil's advantage is iOS requirement (15.0 vs 18.6). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Doongsil sells 1 one-off in-app purchase and Focus Aquarium sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Doongsil ships an update every 11 months, Focus Aquarium fortnightly. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Doongsil | Focus Aquarium |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 11 months | **Fortnightly** |
| Size | 42 MB | 45 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Minseok Song](https://appshunter.io/developer/1680507122) | [ERIK MICHAEL HAFTEL](https://appshunter.io/developer/1884769516) |

## 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 Aquarium

[App page](https://appshunter.io/ios/app/focus-aquarium/id6760512225)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium (Monthly) | $3.99 | per month |
| Premium (Yearly) | $29.99 | per year |
| Premium (Lifetime) | $59.99 | one-time |


## Frequently asked questions

### Is Doongsil free?

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

### Is Focus Aquarium free?

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

### Do Doongsil or Focus Aquarium have ads?

Doongsil shows ads; Focus Aquarium does not.

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

Doongsil ships an update every 11 months, and Focus Aquarium fortnightly. Most recently, Doongsil was updated on October 30, 2026 and Focus Aquarium on October 31, 2026.

---

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