# OneClock vs Duodecuple Calc

The clearest difference is in-app purchases: Duodecuple Calc at none against OneClock's 2. Duodecuple Calc also leads on update cadence (every 2 weeks vs every 3 months). OneClock's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. OneClock sells 2 in-app purchases, starting at $0.99 per month. Duodecuple Calc asks for nothing beyond the download.

OneClock ships an update every 3 months, Duodecuple Calc every 2 weeks. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | OneClock | Duodecuple Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (9 ratings)](https://appshunter.io/ios/app/oneclock-a-simple-flip-clock/id1257395357/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 83.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Subscription | — |
| Size | 11 MB | 36 MB |
| Requires iOS | 16.0 | **15.8.3** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Chengdu Reinvent Technology Co., Ltd.](https://appshunter.io/developer/1250290964) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### OneClock

[App page](https://appshunter.io/ios/app/oneclock-a-simple-flip-clock/id1257395357)

This app offers a variety of customizable clock styles for desktop and mobile devices. Enjoy features like adjustable display modes, font customization, and transparency settings, with multiple clock designs available.

**Highlights:** Multiple clock styles (Flip, Digital, Dial), Desktop display on macOS, Customizable font and transparency, Portrait and landscape modes, Screen not quenching, Home screen and widget support

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.99 | per month |
| Yearly | $9.99 | per year |


### Duodecuple Calc

[App page](https://appshunter.io/ios/app/duodecuple-calc/id6742208421)

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

**In-app purchases:** none


## Frequently asked questions

### Is OneClock free?

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

### Is Duodecuple Calc free?

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

### Do OneClock or Duodecuple Calc have ads?

Duodecuple Calc shows ads; OneClock does not.

### Which is updated more often, OneClock or Duodecuple Calc?

OneClock ships an update every 3 months, and Duodecuple Calc every 2 weeks. Most recently, OneClock was updated on November 2, 2026 and Duodecuple Calc on October 30, 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.*