# CH24.PL vs This Blue

The clearest difference is iOS requirement: CH24.PL at 15.0 against This Blue's 18.2. On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. 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 CH24.PL against 5.0 for This Blue. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

CH24.PL ships an update every 9 months, This Blue every 10 months. The most recent releases landed on July 4, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | CH24.PL | This Blue |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/ch24pl/id1343650745/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/this-blue/id6742713449/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 months** | Every 10 months |
| Monetization | Free | Free |
| Size | 16 MB | 19 MB |
| Requires iOS | **15.0** | 18.2 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Tomasz Kieltyka](https://appshunter.io/developer/1343650744) | [Ben Strak](https://appshunter.io/developer/1799565528) |

## What reviewers say

### CH24.PL

[App page](https://appshunter.io/ios/app/ch24pl/id1343650745)

This app offers free access to a vast collection of articles, photos, and videos about watches. Explore content by brand, read reviews, and discover a glossary of watchmaking terms. Download watch wallpapers and share your passion.

**Highlights:** Thousands of original content pieces, Photos and videos, Content by brand, news, and reviews, Watchmaking glossary, Shopping guide, Downloadable watch wallpapers

**Features:** macOS Compatibility

**In-app purchases:** none


### This Blue

[App page](https://appshunter.io/ios/app/this-blue/id6742713449)

Measure the exact blueness of the sky using your device's camera. Collect and save your sky measurements with time and location, and share them with custom cards. This app offers a modern digital interpretation of historic sky measurement science.

**Highlights:** Measure sky blueness with camera, Interactive 52-shade color wheel, Save sky measurements with time/location, Share sky colors with custom cards, Minimalist interface with scientific aesthetics, Haptic feedback

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CH24.PL free?

CH24.PL is free to download, with no in-app purchases.

### Is This Blue free?

This Blue is free to download, with no in-app purchases.

### Which has better reviews, CH24.PL or This Blue?

CH24.PL and This Blue are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do CH24.PL or This Blue have ads?

Neither CH24.PL nor This Blue shows ads.

### Which is updated more often, CH24.PL or This Blue?

CH24.PL ships an update every 9 months, and This Blue every 10 months. Most recently, CH24.PL was updated on July 4, 2026 and This Blue on September 10, 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.*