# DayO(데이오) vs Bluck

The clearest difference is in-app purchases: DayO(데이오) at none against Bluck's 1. DayO(데이오) also leads on update cadence (every 5 days vs every 11 days) and iOS requirement (12.0 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. Bluck sells 1 in-app purchase, starting at $1.99 per month. DayO(데이오) asks for nothing beyond the download.

DayO(데이오) ships an update every 5 days, Bluck every 11 days. The most recent releases landed on October 10, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | DayO(데이오) | Bluck |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 11 days |
| Size | 37 MB | 120 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [minjae kim](https://appshunter.io/developer/1782458140) | [Seungrae Cho](https://appshunter.io/developer/1620778100) |

## What reviewers say

### DayO(데이오)

[App page](https://appshunter.io/ios/app/dayo/id6738812208)

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

**In-app purchases:** none


### Bluck

[App page](https://appshunter.io/ios/app/bluck-challenge-tracker/id6740204211)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| pro plan | $1.99 | per month |


## Frequently asked questions

### Is DayO(데이오) free?

DayO(데이오) is free to download, with no in-app purchases.

### Is Bluck free?

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

### Do DayO(데이오) or Bluck have ads?

Neither DayO(데이오) nor Bluck shows ads.

### Which is updated more often, DayO(데이오) or Bluck?

DayO(데이오) ships an update every 5 days, and Bluck every 11 days. Most recently, DayO(데이오) was updated on October 10, 2026 and Bluck on September 30, 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.*