# Cyanometer vs Earth Observery

The clearest difference is price: Earth Observery at Free against Cyanometer's $0.99. Earth Observery also leads on rating (5.0 vs 2.8) and update cadence (every 4 weeks vs every 39 months). Cyanometer's advantage is in-app purchases (none vs 3) and chart position (#180 vs unranked). On ratings volume, ads, device support and iOS requirement there is nothing between them.

Earth Observery is free to download; Cyanometer costs $0.99 up front. Earth Observery sells 3 in-app purchases, starting at $1.99 per 7 days. Cyanometer asks for nothing beyond the download.

Earth Observery holds the better App Store score, 5.0 against 2.8. Both are backed by a comparable volume of ratings — 4 and 6 respectively.

Cyanometer ships an update every 39 months, Earth Observery every 4 weeks. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Cyanometer | Earth Observery |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [2.8 (4 ratings)](https://appshunter.io/ios/app/cyanometer/id1476812898/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/earth-observery/id6683308769/reviews)** |
| Number of ratings | 4 | **6** |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 4 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#180** | — |
| Size | 14 MB | 73 MB |
| Requires iOS | **16** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jan-Hendrik von Kuick](https://appshunter.io/developer/1190145903) | [Mahmoud Suliman](https://appshunter.io/developer/571829037) |

## What reviewers say

### Cyanometer

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

**Currently charting:** #180 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


### Earth Observery

[App page](https://appshunter.io/ios/app/earth-observery/id6683308769)

Track natural disasters and extreme weather events globally in near real-time. Get timely updates on earthquakes, cyclones, wildfires, and floods with interactive maps and curated news.

**Highlights:** Near real-time natural event tracking, Interactive maps and heat view, Disaster news from trusted sources, Smart event filtering and sorting, Proximity-based emergency resources, Dark mode for comfortable viewing

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Plan | $1.99 | per 7 days |
| Earth Observery Monthly Plan | $4.99 | per month |
| Earth Observery Annual Plan | $29.99 | per year |


## Frequently asked questions

### Is Cyanometer free?

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

### Is Earth Observery free?

Earth Observery is free to download, with in-app purchases available.

### Which has better reviews, Cyanometer or Earth Observery?

Earth Observery is rated higher. Cyanometer averages 2.8 out of 5 from 4 ratings, while Earth Observery averages 5.0 from 6 ratings.

### Do Cyanometer or Earth Observery have ads?

Neither Cyanometer nor Earth Observery shows ads.

### Which is updated more often, Cyanometer or Earth Observery?

Cyanometer ships an update every 39 months, and Earth Observery every 4 weeks. Most recently, Cyanometer was updated on October 29, 2026 and Earth Observery on October 27, 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.*