TetraClock+ vs Penlight.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TetraClock+
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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 free version are as follows: ・No ads ・Watch App included [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.
Penlight.
This app provides a digital penlight with adjustable brightness and a built-in ruler for quick measurements. It also features color inversion for different examination needs and easy calibration using a credit card.
- Adjustable digital penlight brightness
- Credit card calibration for accuracy
- Color inversion for light/dark modes
- Metric and imperial ruler
- Educational examination tool
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Key Features: - Digital Penlight: Adjustable brightness slider for precise illumination - Easy Calibration: Quickly calibrate with a credit card to for accurate measurements - Color Inversion: Easily switch between light and dark modes for different examination needs - Ruler: Metric and imperial ruler for quick measurements Disclaimer: This app is intended for educational purposes only. It is not to be used for the diagnosis or treatment of any medical condition.
Screenshots
Verdict
The clearest difference is update cadence: Penlight. at daily against TetraClock+'s every 5 days. Penlight. also leads on price ($1.99 vs $2.99). TetraClock+'s advantage is device support (4 vs 1) and iOS requirement (14.0 vs 16.0). On ads and in-app purchases 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+ costs $2.99 and Penlight. $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
TetraClock+ ships an update every 5 days, Penlight. daily. The most recent releases landed on October 7, 2026 and October 25, 2026 respectively.
| Parameter | TetraClock+ | Penlight. |
|---|---|---|
| Price | $2.99 | $1.99 — better |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 5 days | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone |
| Requires iOS | 14.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 6 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Legal Prompt Inc. | My Call Bag LLC |
In-app purchases
TetraClock+
No in-app purchases
Penlight.
No in-app purchases
