# Hacker Clock vs When

The clearest difference is review sentiment: When at 90% against Hacker Clock's 54%. When also leads on update cadence (weekly vs every 15 months) and monetization model (ad-supported vs paid). Hacker Clock's advantage is ads (none vs shown). On price, ratings volume, 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.

When holds the better App Store score, 4.7 against 4.5. Both are backed by a comparable volume of ratings — 41 and 28 respectively. Written reviews point the same way: 54% of Hacker Clock's written reviews are positive against 90% of When's.

Hacker Clock ships an update every 15 months, When weekly. The most recent releases landed on September 26, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Hacker Clock | When |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (41 ratings)](https://appshunter.io/ios/app/hacker-clock-green-matrix/id659883519/reviews) | **[4.7 (28 ratings)](https://appshunter.io/ios/app/when-flip-clock/id1539325158/reviews)** |
| Number of ratings | **41** | 28 |
| Positive reviews | 53.8% of reviews | **90.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 15 months | **Weekly** |
| Monetization | Paid | **Ad-supported** |
| Size | 12 MB | 73 MB |
| Requires iOS | 12.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Leszek Szary](https://appshunter.io/developer/464282200) | [磊 岑](https://appshunter.io/developer/1102462338) |

## What reviewers say

### Hacker Clock

[App page](https://appshunter.io/ios/app/hacker-clock-green-matrix/id659883519)

Transform your device into a unique clock displaying animated hexadecimal code. Watch green hexadecimal values flow across the screen, simulating complex data processing. Ideal for computer enthusiasts, hackers, and fans of futuristic aesthetics.

**Highlights:** Animated hexadecimal code display, Three color variants (green, red, blue), Horizontal and vertical display modes, 12- and 24-hour format options, Unique clock for geeks and fans

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

**In-app purchases:** none


### 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 Hacker Clock free?

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

### Is When free?

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

### Which has better reviews, Hacker Clock or When?

When is rated higher. Hacker Clock averages 4.5 out of 5 from 41 ratings, while When averages 4.7 from 28 ratings.

### Do Hacker Clock or When have ads?

When shows ads; Hacker Clock does not.

### Which is updated more often, Hacker Clock or When?

Hacker Clock ships an update every 15 months, and When weekly. Most recently, Hacker Clock was updated on September 26, 2026 and When on September 18, 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.*