Dark30 vs Penlight.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Dark30
Control thermal imaging devices remotely from your mobile or tablet. Stream real-time video and manage pan and tilt functions for precise adjustments.
- Mobile/tablet connectivity
- Thermal imaging control
- Real-time video streaming
- Pan tilt rotation control
Read full descriptionHide full description
Dark30 is an app that provides mobile or tablet connectivity for thermal imaging pan tilt control. Through this app, real-time video flow control and pan tilt rotation can be achieved.
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
Read full descriptionHide full description
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 price: Dark30 at Free against Penlight.'s $1.99. Dark30 also leads on device support (3 vs 1) and iOS requirement (12.4 vs 16.0). Penlight.'s advantage is update cadence (daily vs every 6 weeks). On rating, ratings volume, 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
Dark30 is free to download; Penlight. costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Dark30 against 5.0 for Penlight.. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Dark30 ships an update every 6 weeks, Penlight. daily. The most recent releases landed on June 4, 2026 and September 14, 2026 respectively.
| Parameter | Dark30 | Penlight. |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Number of ratings | 1 | 1 |
| Update frequency | Every 6 weeks | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 12.4 — better | 16.0 |
| Further details — not scored | ||
| Size | 45 MB | 1 MB |
| Age rating | 17+ | 4+ |
| Developer | Sellmark Corporation | My Call Bag LLC |
Customer experience
Dark30
Penlight.
In-app purchases
Dark30
No in-app purchases
Penlight.
No in-app purchases
