# Hacker Clock vs Calculator HD (for iPad)

The clearest difference is price: Hacker Clock at Free against Calculator HD (for iPad)'s $1.99. Hacker Clock also leads on device support (3 vs 1) and iOS requirement (12.0 vs 14.0). Calculator HD (for iPad)'s advantage is update cadence (fortnightly vs every 15 months) and review sentiment (63% vs 54%). On rating, ratings volume, ads and in-app purchases there is nothing between them.

Hacker Clock is free to download; Calculator HD (for iPad) costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Calculator HD (for iPad) holds the better App Store score, 4.7 against 4.5. Both are backed by a comparable volume of ratings — 42 and 26 respectively. Written reviews point the same way: 54% of Hacker Clock's written reviews are positive against 63% of Calculator HD (for iPad)'s.

Hacker Clock ships an update every 15 months, Calculator HD (for iPad) fortnightly. The most recent releases landed on November 3, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Hacker Clock | Calculator HD (for iPad) |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [4.5 (42 ratings)](https://appshunter.io/ios/app/hacker-clock-green-matrix/id659883519/reviews) | **[4.7 (26 ratings)](https://appshunter.io/ios/app/calculator-hd-for-ipad/id760018895/reviews)** |
| Number of ratings | **42** | 26 |
| Positive reviews | 53.8% of reviews | **63.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Fortnightly** |
| Monetization | Paid | **Free** |
| Size | 12 MB | 2 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Leszek Szary](https://appshunter.io/developer/464282200) | [帅 刘](https://appshunter.io/developer/696578727) |

## 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


### Calculator HD (for iPad)

[App page](https://appshunter.io/ios/app/calculator-hd-for-ipad/id760018895)

This app offers a powerful and intuitive calculator experience optimized for larger screens. It features both basic and scientific modes, with convenient multitasking capabilities like Split Screen support and easy copy-pasting of results.

**Highlights:** Split Screen and Side Over support, Swipe to delete input errors, Copy and paste calculation results, Vertical basic mode, Horizontal scientific mode, Optimized for iOS

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Hacker Clock free?

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

### Is Calculator HD (for iPad) free?

Calculator HD (for iPad) costs $1.99, with no in-app purchases.

### Which has better reviews, Hacker Clock or Calculator HD (for iPad)?

Calculator HD (for iPad) is rated higher. Hacker Clock averages 4.5 out of 5 from 42 ratings, while Calculator HD (for iPad) averages 4.7 from 26 ratings.

### Do Hacker Clock or Calculator HD (for iPad) have ads?

Neither Hacker Clock nor Calculator HD (for iPad) shows ads.

### Which is updated more often, Hacker Clock or Calculator HD (for iPad)?

Hacker Clock ships an update every 15 months, and Calculator HD (for iPad) fortnightly. Most recently, Hacker Clock was updated on November 3, 2026 and Calculator HD (for iPad) on November 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.*