# Sci vs TetraClock

The clearest difference is price: TetraClock at Free against Sci's $3.99. TetraClock also leads on update cadence (every 2 days vs every 6 months) and iOS requirement (14.0 vs 17.0). Sci's advantage is rating (5.0 vs 3.7) and ads (none vs shown). On ratings volume, in-app purchases and device support there is nothing between them.

TetraClock is free to download; Sci costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Sci holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 3 and 3 respectively.

Sci ships an update every 6 months, TetraClock every 2 days. The most recent releases landed on October 24, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Sci | TetraClock |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/sci-fi-calculator-widget/id6470088682/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/tetraclock-falling-block/id6504890211/reviews) |
| Number of ratings | 3 | 3 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 2 days** |
| Monetization | Paid | **Ad-supported** |
| Size | 21 MB | 6 MB |
| Requires iOS | 17.0 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [NSTE, LLC](https://appshunter.io/developer/1671708345) | [Legal Prompt Inc.](https://appshunter.io/developer/1490746932) |

## What reviewers say

### Sci

[App page](https://appshunter.io/ios/app/sci-fi-calculator-widget/id6470088682)

Customize your home screen with a calculator widget featuring 16 unique sci-fi themes. Enjoy futuristic aesthetics and sounds, transforming your device into a futuristic interface with a simple tap.

**Highlights:** 16 sci-fi themes, Home screen widget, Tap to switch themes, Futuristic sounds, iPhone and iPad support

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

**In-app purchases:** none


### TetraClock

[App page](https://appshunter.io/ios/app/tetraclock-falling-block/id6504890211)

This clock app uses falling tetromino blocks to display the time. Customize colors, animations, and display formats. Note that the displayed time may have slight discrepancies due to animation effects.

**Highlights:** Tetromino block time display, Customizable colors and animations, 12/24-hour format, Seconds display toggle, Adjustable falling speed, Background color options

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sci free?

Sci costs $3.99, with no in-app purchases.

### Is TetraClock free?

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

### Which has better reviews, Sci or TetraClock?

Sci is rated higher. Sci averages 5.0 out of 5 from 3 ratings, while TetraClock averages 3.7 from 3 ratings.

### Do Sci or TetraClock have ads?

TetraClock shows ads; Sci does not.

### Which is updated more often, Sci or TetraClock?

Sci ships an update every 6 months, and TetraClock every 2 days. Most recently, Sci was updated on October 24, 2026 and TetraClock on October 22, 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.*