# Cyanometer vs Rhyy

The clearest difference is price: Rhyy at Free against Cyanometer's $0.99. Rhyy also leads on update cadence (every 11 days vs every 39 months). Cyanometer's advantage is chart position (#185 vs unranked). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

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

Cyanometer ships an update every 39 months, Rhyy every 11 days. The most recent releases landed on October 9, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Cyanometer | Rhyy |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[2.8 (4 ratings)](https://appshunter.io/ios/app/cyanometer/id1476812898/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 11 days** |
| Monetization | Paid | — |
| Best chart rank | **#185** | — |
| Size | 14 MB | 10 MB |
| Requires iOS | **16** | 17.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 4+ | 12+ |
| Developer | [Jan-Hendrik von Kuick](https://appshunter.io/developer/1190145903) | [Patrick Habluetzel](https://appshunter.io/developer/6773100524) |

## What reviewers say

### Cyanometer

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

**Currently charting:** #185 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


### Rhyy

[App page](https://appshunter.io/ios/app/rhyy/id6773100522)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Cyanometer free?

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

### Is Rhyy free?

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

### Do Cyanometer or Rhyy have ads?

Neither Cyanometer nor Rhyy shows ads.

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

Cyanometer ships an update every 39 months, and Rhyy every 11 days. Most recently, Cyanometer was updated on October 9, 2026 and Rhyy on October 15, 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.*