# Smooth Countdown vs D

The clearest difference is price: D at Free against Smooth Countdown's $0.99. D also leads on update cadence (every 2 months vs every 21 months). Smooth Countdown's advantage is iOS requirement (15.6 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

D is free to download; Smooth Countdown costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Smooth Countdown ships an update every 21 months, D every 2 months. The most recent releases landed on October 4, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Smooth Countdown | D |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/d-day-countdown/id1518400866/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 2 months** |
| Monetization | — | Free |
| Size | 1 MB | 7 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Piet Jonas](https://appshunter.io/developer/288060167) | [Si-Wan Yoon](https://appshunter.io/developer/1493152910) |

## What reviewers say

### Smooth Countdown

[App page](https://appshunter.io/ios/app/smooth-countdown/id485337187)

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

**In-app purchases:** none


### D

[App page](https://appshunter.io/ios/app/d-day-countdown/id1518400866)

Easily set and track important dates, such as D-Day. This utility app helps you monitor the remaining time until your specified events.

**Highlights:** Set D-Day, Check remaining time, Event tracking, Simple interface

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

**In-app purchases:** none


## Frequently asked questions

### Is Smooth Countdown free?

Smooth Countdown costs $0.99, with no in-app purchases.

### Is D free?

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

### Do Smooth Countdown or D have ads?

Neither Smooth Countdown nor D shows ads.

### Which is updated more often, Smooth Countdown or D?

Smooth Countdown ships an update every 21 months, and D every 2 months. Most recently, Smooth Countdown was updated on October 4, 2026 and D 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.*