# DuoCoStrip Pro vs Penlight.

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.

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.

## The numbers

| Metric | DuoCoStrip Pro | Penlight. |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [1.8 (6 ratings)](https://appshunter.io/ios/app/duocostrip-pro/id6444222032/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/penlight/id6621271103/reviews)** |
| Number of ratings | **6** | 1 |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Daily** |
| Monetization | **Free** | Paid |
| Size | 232 MB | 1 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [红建 付](https://appshunter.io/developer/1679507090) | [My Call Bag LLC](https://appshunter.io/developer/1243282862) |

## What reviewers say

### DuoCoStrip Pro

[App page](https://appshunter.io/ios/app/duocostrip-pro/id6444222032)

Control colorful synchronous lights with various modes. Adjust light color, activate dynamic colorful effects, and sync lighting changes to music or microphone input.

**Highlights:** Adjust light color, Colorful mode, Music-driven lighting changes, Microphone sound control

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Penlight.

[App page](https://appshunter.io/ios/app/penlight/id6621271103)

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.

**Highlights:** Adjustable digital penlight brightness, Credit card calibration for accuracy, Color inversion for light/dark modes, Metric and imperial ruler, Educational examination tool

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is DuoCoStrip Pro free?

DuoCoStrip Pro is free to download, with no in-app purchases.

### Is Penlight. free?

Penlight. costs $1.99, with no in-app purchases.

### Which has better reviews, DuoCoStrip Pro or Penlight.?

Penlight. is rated higher. DuoCoStrip Pro averages 1.8 out of 5 from 6 ratings, while Penlight. averages 5.0 from 1 ratings.

### Do DuoCoStrip Pro or Penlight. have ads?

Neither DuoCoStrip Pro nor Penlight. shows ads.

### Which is updated more often, DuoCoStrip Pro or Penlight.?

DuoCoStrip Pro ships an update every 2 months, and Penlight. daily. Most recently, DuoCoStrip Pro was updated on August 18, 2026 and Penlight. on September 14, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*