# D vs Secondify

The clearest difference is ads: D at none against Secondify's shown. D also leads on update cadence (every 3 months vs every 36 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

D ships an update every 3 months, Secondify every 36 months. The most recent releases landed on September 23, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | D | Secondify |
| --- | --- | --- |
| Price | Free | 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** | Yes |
| Update frequency | **Every 3 months** | Every 36 months |
| Monetization | Free | — |
| Size | 7 MB | 5 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Si-Wan Yoon](https://appshunter.io/developer/1493152910) | [ippei uchida](https://appshunter.io/developer/1702609212) |

## What reviewers say

### 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


### Secondify

[App page](https://appshunter.io/ios/app/secondify/id6461645824)

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

**In-app purchases:** none


## Frequently asked questions

### Is D free?

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

### Is Secondify free?

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

### Do D or Secondify have ads?

Secondify shows ads; D does not.

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

D ships an update every 3 months, and Secondify every 36 months. Most recently, D was updated on September 23, 2026 and Secondify on October 4, 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.*