# EF Scale vs Cyanometer

The clearest difference is price: EF Scale at Free against Cyanometer's $0.99. EF Scale also leads on rating (4.5 vs 2.8) and review sentiment (67% vs 25%). Cyanometer's advantage is chart position (#189 vs unranked) and iOS requirement (16 vs 26.0). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

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

EF Scale holds the better App Store score, 4.5 against 2.8. Both are backed by a comparable volume of ratings — 4 and 4 respectively. Written reviews point the same way: 67% of EF Scale's written reviews are positive against 25% of Cyanometer's.

EF Scale ships an update every 20 months, Cyanometer every 39 months. The most recent releases landed on August 8, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | EF Scale | Cyanometer |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.5 (4 ratings)](https://appshunter.io/ios/app/ef-scale/id418856071/reviews)** | [2.8 (4 ratings)](https://appshunter.io/ios/app/cyanometer/id1476812898/reviews) |
| Number of ratings | 4 | 4 |
| Positive reviews | **66.7% of reviews** | 25.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 20 months** | Every 39 months |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#189** |
| Size | 18 MB | 14 MB |
| Requires iOS | 26.0 | **16** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [WeatherWary LLC](https://appshunter.io/developer/418856074) | [Jan-Hendrik von Kuick](https://appshunter.io/developer/1190145903) |

## What reviewers say

### EF Scale

[App page](https://appshunter.io/ios/app/ef-scale/id418856071)

Assess tornado and wind damage with this tool that simplifies the Enhanced Fujita (EF) Scale. Follow on-screen prompts to select damage indicators and degrees of damage, then adjust for construction variability to estimate wind speeds.

**Highlights:** Simplified EF Scale assessment, Damage indicator selection, Degree of damage input, Construction variability adjustment, Visual damage examples, About and share functions

**Features:** Vision Pro support

**In-app purchases:** none


### Cyanometer

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

**Currently charting:** #189 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 EF Scale free?

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

### Is Cyanometer free?

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

### Which has better reviews, EF Scale or Cyanometer?

EF Scale is rated higher. EF Scale averages 4.5 out of 5 from 4 ratings, while Cyanometer averages 2.8 from 4 ratings.

### Do EF Scale or Cyanometer have ads?

Neither EF Scale nor Cyanometer shows ads.

### Which is updated more often, EF Scale or Cyanometer?

EF Scale ships an update every 20 months, and Cyanometer every 39 months. Most recently, EF Scale was updated on August 8, 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.*