# OneClock vs When

The clearest difference is rating: When at 4.7 against OneClock's 3.9. When also leads on in-app purchases (none vs 2) and update cadence (weekly vs every 3 months). OneClock's advantage is ads (none vs shown). On price, review sentiment and device support there is nothing between them.

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

When holds the better App Store score, 4.7 against 3.9. Both are backed by a comparable volume of ratings — 9 and 28 respectively. Written reviews point the same way: 83% of OneClock's written reviews are positive against 90% of When's.

OneClock ships an update every 3 months, When weekly. The most recent releases landed on September 30, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | OneClock | When |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (9 ratings)](https://appshunter.io/ios/app/oneclock-a-simple-flip-clock/id1257395357/reviews) | **[4.7 (28 ratings)](https://appshunter.io/ios/app/when-flip-clock/id1539325158/reviews)** |
| Number of ratings | 9 | **28** |
| Positive reviews | 83.0% of reviews | **90.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | Subscription | **Ad-supported** |
| Size | 11 MB | 73 MB |
| Requires iOS | 16.0 | **10.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Chengdu Reinvent Technology Co., Ltd.](https://appshunter.io/developer/1250290964) | [磊 岑](https://appshunter.io/developer/1102462338) |

## 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 |


### When

[App page](https://appshunter.io/ios/app/when-flip-clock/id1539325158)

This app offers a minimalist flip clock experience with customizable widgets. It features a full-screen display with classic page-turning animations and adjustable brightness. Personalize your time display with options for seconds, date, and week.

**Highlights:** Full-screen classic flip animation, Minimalist design style, Customizable time display (seconds, date, week), 12/24 hour mode switching, Adjustable screen brightness, Multiple widget options (Flip Clock, Digital Clock, Calendar, Progress Bar, Disc Clock)

**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 When free?

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

### Which has better reviews, OneClock or When?

When is rated higher. OneClock averages 3.9 out of 5 from 9 ratings, while When averages 4.7 from 28 ratings.

### Do OneClock or When have ads?

When shows ads; OneClock does not.

### Which is updated more often, OneClock or When?

OneClock ships an update every 3 months, and When weekly. Most recently, OneClock was updated on September 30, 2026 and When on October 1, 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.*