# Countdown, Event Reminder vs Dúo Calculator

The clearest difference is price: Countdown, Event Reminder at Free against Dúo Calculator's $1.99. Countdown, Event Reminder also leads on iOS requirement (16.0 vs 26.0). Dúo Calculator's advantage is in-app purchases (none vs 1) and ads (none vs shown). On update cadence and device support there is nothing between them.

Countdown, Event Reminder is free to download; Dúo Calculator costs $1.99 up front. Countdown, Event Reminder sells 1 one-off in-app purchase. Dúo Calculator asks for nothing beyond the download.

Countdown, Event Reminder ships an update every 4 months, Dúo Calculator every 6 months. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Countdown, Event Reminder | Dúo Calculator |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.6 (159 ratings)](https://appshunter.io/ios/app/countdown-event-reminder/id1355293814/reviews)** | — |
| Number of ratings | **159** | — |
| Positive reviews | 92.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 4 months** | Every 6 months |
| Monetization | Free with in-app purchases | — |
| Size | 7 MB | 3 MB |
| Requires iOS | **16.0** | 26.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Tevfik Yucek](https://appshunter.io/developer/566982862) | [Alejandro Hernandez Mitre](https://appshunter.io/developer/1827109770) |

## What reviewers say

### Countdown, Event Reminder

[App page](https://appshunter.io/ios/app/countdown-event-reminder/id1355293814)

Easily track important life events with timely reminders. See remaining time in various units and access upcoming events with a convenient widget. Never miss a birthday, anniversary, or holiday again.

**Highlights:** Organize and track important events, Receive scheduled reminders, View remaining time (years, months, days, hours, minutes), Convenient Today Widget for quick access, Customizable event tracking

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $4.99 | one-time |


### Dúo Calculator

[App page](https://appshunter.io/ios/app/duo-calculator/id6754038433)

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

**In-app purchases:** none


## Frequently asked questions

### Is Countdown, Event Reminder free?

Countdown, Event Reminder is free to download, with in-app purchases available.

### Is Dúo Calculator free?

Dúo Calculator costs $1.99, with no in-app purchases.

### Do Countdown, Event Reminder or Dúo Calculator have ads?

Countdown, Event Reminder shows ads; Dúo Calculator does not.

### Which is updated more often, Countdown, Event Reminder or Dúo Calculator?

Countdown, Event Reminder ships an update every 4 months, and Dúo Calculator every 6 months. Most recently, Countdown, Event Reminder was updated on October 29, 2026 and Dúo Calculator on October 28, 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.*