Sci vs TetraClock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sci
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.
- 16 sci-fi themes
- Home screen widget
- Tap to switch themes
- Futuristic sounds
- iPhone and iPad support
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Enjoy the beautiful looks and sounds of 16 sci-fi styles on your home screen with this calculator widget. Just add the widget to your home screen and tap the top text area to scroll and switch themes. Make your iPhone or iPad look and sound like a device from the future.
TetraClock
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.
- Tetromino block time display
- Customizable colors and animations
- 12/24-hour format
- Seconds display toggle
- Adjustable falling speed
- Background color options
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'TetraClock' is a clock app that represents the time by stacking seven types of single-sided tetromino-shaped blocks as they fall. The differences from the paid version are as follows: ・Contains ads ・No Watch App [How to Use] Tap the screen: Open the settings screen. Long press the screen: Stack the blocks again. [Main Features] - Switch between 12/24-hour display - Toggle seconds display ON/OFF - Monotone display - Fill in ON/OFF - Change outline color - Change transition animations - Change falling speed - Change background color [Notices] Due to the animation effect used for changing numbers, there may be a discrepancy between the displayed time and the actual time. Please do not use the displayed time as a basis for important decisions.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Sci | TetraClock |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 5.0 (3 ratings) — better | 3.7 (3 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 | 3 |
| Update frequency | Every 6 months | Every 2 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | Ad-supported — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 21 MB | 6 MB |
| Age rating | 17+ | 4+ |
| Developer | NSTE, LLC | Legal Prompt Inc. |
In-app purchases
Sci
No in-app purchases
TetraClock
No in-app purchases
