# D vs Onseol

The clearest difference is in-app purchases: D at none against Onseol's 1. D also leads on ads (none vs shown) and update cadence (every 3 days vs every 11 days). On price and device support there is nothing between them.

Both are free to download. Onseol sells 1 one-off in-app purchase. D asks for nothing beyond the download.

D ships an update every 3 days, Onseol every 11 days. The most recent releases landed on October 12, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | D | Onseol |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 days** | Every 11 days |
| Size | 33 MB | 26 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [HeungYeol Kim](https://appshunter.io/developer/1878087341) | [Mustafa Salim Erek](https://appshunter.io/developer/1896175573) |

## What reviewers say

### D

[App page](https://appshunter.io/ios/app/d-day/id6759724605)

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

**In-app purchases:** none


### Onseol

[App page](https://appshunter.io/ios/app/onseol-countdown-widget/id6782953468)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Onseol Pro | $9.99 | one-time |


## Frequently asked questions

### Is D free?

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

### Is Onseol free?

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

### Do D or Onseol have ads?

Onseol shows ads; D does not.

### Which is updated more often, D or Onseol?

D ships an update every 3 days, and Onseol every 11 days. Most recently, D was updated on October 12, 2026 and Onseol on September 29, 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.*