# airCHeck vs Cyanometer

The clearest difference is review sentiment: airCHeck at 100% against Cyanometer's 25%. airCHeck also leads on price (Free vs $0.99) and update cadence (every 5 months vs every 39 months). Cyanometer's advantage is chart position (#194 vs unranked). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

airCHeck is free to download; Cyanometer costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

airCHeck ships an update every 5 months, Cyanometer every 39 months. The most recent releases landed on August 29, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | airCHeck | Cyanometer |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[2.8 (4 ratings)](https://appshunter.io/ios/app/cyanometer/id1476812898/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | **100.0% of reviews** | 25.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 39 months |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#194** |
| Size | 25 MB | 14 MB |
| Requires iOS | **15.0** | 16 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Blackpoints AG](https://appshunter.io/developer/542595401) | [Jan-Hendrik von Kuick](https://appshunter.io/developer/1190145903) |

## What reviewers say

### airCHeck

[App page](https://appshunter.io/ios/app/aircheck/id577766644)

Check current air quality across Switzerland and Liechtenstein. View pollution levels, health effects, and protective advice for high pollution events.

**Highlights:** Real-time air quality checks, Coverage of Switzerland and Liechtenstein, Pollution index display, Fine particle, ozone, and nitrogen dioxide data, Health effects information, Protective advice for high pollution

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

**In-app purchases:** none


### Cyanometer

[App page](https://appshunter.io/ios/app/cyanometer/id1476812898)

**Currently charting:** #194 Top Paid · Weather (US App Store)

Measure the intensity of blue in the sky to understand atmospheric conditions. Save scans with location and time data for comparison across different places. Offers modern, historical, and custom color scales.

**Highlights:** Measure sky blueness intensity, Modern, Saussure, and custom scales, Save scans with date, time, and location, Compare sky conditions across locations, Privacy-focused, no external data processing

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

**In-app purchases:** none


## Frequently asked questions

### Is airCHeck free?

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

### Is Cyanometer free?

Cyanometer costs $0.99, with no in-app purchases.

### Do airCHeck or Cyanometer have ads?

Neither airCHeck nor Cyanometer shows ads.

### Which is updated more often, airCHeck or Cyanometer?

airCHeck ships an update every 5 months, and Cyanometer every 39 months. Most recently, airCHeck was updated on August 29, 2026 and Cyanometer on September 22, 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.*