# D vs Timer calendar

The clearest difference is in-app purchases: D at none against Timer calendar's 1. Timer calendar's advantage is update cadence (every 5 weeks vs every 3 months) and iOS requirement (14.0 vs 17.0). On price, ads and device support there is nothing between them.

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

D ships an update every 3 months, Timer calendar every 5 weeks. The most recent releases landed on September 23, 2026 and September 4, 2026 respectively.

## The numbers

| Metric | D | Timer calendar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/d-day-countdown/id1518400866/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 95.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 7 MB | 6 MB |
| Requires iOS | 17.0 | **14.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Si-Wan Yoon](https://appshunter.io/developer/1493152910) | [Yongjun Lee](https://appshunter.io/developer/1550041806) |

## 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


### Timer calendar

[App page](https://appshunter.io/ios/app/timer-calendar-records-timer/id1550041804)

Track your time spent on various activities like working out or studying. Visualize your progress with daily, weekly, and monthly reports. Gain insights into your time management habits.

**Highlights:** Time recording for activities, Calendar integration, Daily progress reports, Weekly progress reports, Monthly progress reports, Time measurement

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Frequently asked questions

### Is D free?

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

### Is Timer calendar free?

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

### Do D or Timer calendar have ads?

Neither D nor Timer calendar shows ads.

### Which is updated more often, D or Timer calendar?

D ships an update every 3 months, and Timer calendar every 5 weeks. Most recently, D was updated on September 23, 2026 and Timer calendar on September 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.*