# D vs Onseol

The clearest difference is in-app purchases: D at none against Onseol's 1. Onseol's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 3 months). On price, device support and iOS requirement 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 months, Onseol every 3 weeks. The most recent releases landed on November 1, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | D | Onseol |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/d-day-counter/id906689489/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Ad-supported | — |
| Size | 6 MB | 28 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [EONSOFT](https://appshunter.io/developer/899851112) | [Mustafa Salim Erek](https://appshunter.io/developer/1896175573) |

## What reviewers say

### D

[App page](https://appshunter.io/ios/app/d-day-counter/id906689489)

Easily track important dates and countdown to significant events. This app helps you remember anniversaries, birthdays, and other milestones by calculating the remaining days. Never forget a special occasion again with this simple countdown tool.

**Highlights:** Countdown to special dates, Anniversary tracking, Birthday reminders, Event countdowns, Simple interface

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases:** none


### Onseol

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

**Features:** macOS Compatibility, Family Sharing, 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?

D shows ads; Onseol does not.

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

D ships an update every 3 months, and Onseol every 3 weeks. Most recently, D was updated on November 1, 2026 and Onseol on October 24, 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.*