# GCU Taskon vs Sumbi

The clearest difference is in-app purchases: GCU Taskon at none against Sumbi's 3. GCU Taskon also leads on device support (3 vs 1). Sumbi's advantage is iOS requirement (16.4 vs 26.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Sumbi sells 3 one-off in-app purchases. GCU Taskon asks for nothing beyond the download.

GCU Taskon ships an update every 4 days, Sumbi weekly. The most recent releases landed on November 9, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | GCU Taskon | Sumbi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sumbi-study-focus-timer/id6802502926/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Weekly |
| Monetization | — | Free |
| Size | 16 MB | 94 MB |
| Requires iOS | 26.0 | **16.4** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Shin Geonu](https://appshunter.io/developer/1891211361) | [나이스데이](https://appshunter.io/developer/1751418356) |

## What reviewers say

### GCU Taskon

[App page](https://appshunter.io/ios/app/gcu-taskon/id6761740047)

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

**In-app purchases:** none


### Sumbi

[App page](https://appshunter.io/ios/app/sumbi-study-focus-timer/id6802502926)

This app encourages users to spend less time on their phones by gamifying digital detox. Users engage in timed "dives" away from their devices, earning virtual sea creatures based on their focus duration. It offers a peaceful, non-punitive approach to building healthier digital habits.

**Highlights:** Timed phone-free dives, Unlock virtual sea creatures, Personalized ocean environment, Buddy dive feature, Night sea creatures, Diary-like dive log

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Shallow Sea Creature | $0.99 | one-time |
| Deep Sea Creature | $1.99 | one-time |
| Abyssal Creature | $2.99 | one-time |


## Frequently asked questions

### Is GCU Taskon free?

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

### Is Sumbi free?

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

### Do GCU Taskon or Sumbi have ads?

Neither GCU Taskon nor Sumbi shows ads.

### Which is updated more often, GCU Taskon or Sumbi?

GCU Taskon ships an update every 4 days, and Sumbi weekly. Most recently, GCU Taskon was updated on November 9, 2026 and Sumbi on November 6, 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.*