1 / f Clock vs TetraClock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
1 / f Clock
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"1 / f Clock" is a clock app. Motion graphics are generated by fluctuation.
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 in-app purchases: TetraClock at none against 1 / f Clock's 1. TetraClock also leads on update cadence (every 2 days vs every 7 months). 1 / f Clock's advantage is ads (none vs shown) and iOS requirement (8.1 vs 14.0). On price 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
Both are free to download. 1 / f Clock sells 1 one-off in-app purchase. TetraClock asks for nothing beyond the download.
1 / f Clock ships an update every 7 months, TetraClock every 2 days. The most recent releases landed on October 26, 2026 and October 22, 2026 respectively.
| Parameter | 1 / f Clock | TetraClock |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.7 (3 ratings) — better |
| Number of ratings | — | 3 — better |
| Update frequency | Every 7 months | Every 2 days — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | — | Ad-supported |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.1 — better | 14.0 |
| Further details — not scored | ||
| Size | 47 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Y. MOCHIDUKI | Legal Prompt Inc. |
In-app purchases
1 / f Clock
- Remove Ads$0.99
TetraClock
No in-app purchases
Questions
Is 1 / f Clock free?
Is TetraClock free?
Do 1 / f Clock or TetraClock have ads?
Which is updated more often, 1 / f Clock or TetraClock?
Other comparisons
