# CalendarDuo vs Gen

The clearest difference is in-app purchases: CalendarDuo at none against Gen's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Gen sells 1 one-off in-app purchase. CalendarDuo asks for nothing beyond the download.

CalendarDuo ships an update every 4 months, Gen every 3 months. The most recent releases landed on October 15, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | CalendarDuo | Gen |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Ad-supported | — |
| Size | 41 MB | 7 MB |
| Requires iOS | **15.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Chun Lam](https://appshunter.io/developer/1565498900) | [Kei Suefuji](https://appshunter.io/developer/1388335881) |

## What reviewers say

### 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


### Gen

[App page](https://appshunter.io/ios/app/gen-go/id6445837465)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PREMIUM | $3.99 | one-time |


## Frequently asked questions

### Is CalendarDuo free?

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

### Is Gen free?

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

### Do CalendarDuo or Gen have ads?

Both CalendarDuo and Gen show ads.

### Which is updated more often, CalendarDuo or Gen?

CalendarDuo ships an update every 4 months, and Gen every 3 months. Most recently, CalendarDuo was updated on October 15, 2026 and Gen on October 14, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*