# コレクト vs CalendarDuo

The clearest difference is ads: コレクト at none against CalendarDuo's shown. コレクト also leads on iOS requirement (10.3 vs 15.1). CalendarDuo's advantage is update cadence (every 4 months vs every 32 months). On price, in-app purchases and device support there is nothing between them.

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

コレクト ships an update every 32 months, CalendarDuo every 4 months. The most recent releases landed on October 26, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | コレクト | CalendarDuo |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 32 months | **Every 4 months** |
| Monetization | — | Ad-supported |
| Size | 1 MB | 41 MB |
| Requires iOS | **10.3** | 15.1 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Synon,Inc.](https://appshunter.io/developer/349298085) | [Chun Lam](https://appshunter.io/developer/1565498900) |

## What reviewers say

### コレクト

[App page](https://appshunter.io/ios/app/id1189464513)

**In-app purchases:** none


### CalendarDuo

[App page](https://appshunter.io/ios/app/calendarduo/id1589593639)

Easily manage and view holidays from two different countries simultaneously. This utility app offers instant switching between calendars, a dual-view display, and helpful tools like a world clock and currency exchange.

**Highlights:** Switch between two world calendars instantly, Duo-view with holidays from two countries, Daylight Saving Time dates, Currency exchange rate, World clock, Add notes

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is コレクト free?

コレクト is free to download, with no in-app purchases.

### Is CalendarDuo free?

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

### Do コレクト or CalendarDuo have ads?

CalendarDuo shows ads; コレクト does not.

### Which is updated more often, コレクト or CalendarDuo?

コレクト ships an update every 32 months, and CalendarDuo every 4 months. Most recently, コレクト was updated on October 26, 2026 and CalendarDuo on October 15, 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.*