DuoCoStrip Pro vs Penlight.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DuoCoStrip Pro
Control colorful synchronous lights with various modes. Adjust light color, activate dynamic colorful effects, and sync lighting changes to music or microphone input.
- Adjust light color
- Colorful mode
- Music-driven lighting changes
- Microphone sound control
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The App can control colorful synchronous lights, including the following functions. - Support the adjustment of light color. - Support this is colorful mode. - Support for controlling lighting changes by playing music. - Support collecting microphone sound to control lighting changes.
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 price: DuoCoStrip Pro at Free against Penlight.'s $1.99. DuoCoStrip Pro also leads on ratings volume (6 vs 1) and iOS requirement (11.0 vs 16.0). Penlight.'s advantage is rating (5.0 vs 1.8) and update cadence (daily vs every 2 months). On ads, 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
DuoCoStrip Pro is free to download; Penlight. costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Penlight. holds the better App Store score, 5.0 against 1.8. That said, the two scores are not equally well evidenced: DuoCoStrip Pro has 6 ratings behind it against 1, so its average is the more settled of the two.
DuoCoStrip Pro ships an update every 2 months, Penlight. daily. The most recent releases landed on August 18, 2026 and September 14, 2026 respectively.
| Parameter | DuoCoStrip Pro | Penlight. |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 1.8 (6 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 25.0% of reviews | — |
| Number of ratings | 6 — better | 1 |
| Update frequency | Every 2 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 11.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 232 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | 红建 付 | My Call Bag LLC |
Customer experience
DuoCoStrip Pro
Penlight.
In-app purchases
DuoCoStrip Pro
No in-app purchases
Penlight.
No in-app purchases
