# Cyanometer vs RoadMaster

The clearest difference is price: RoadMaster at Free against Cyanometer's $0.99. RoadMaster also leads on update cadence (every 6 weeks vs every 39 months) and iOS requirement (11.0 vs 16). Cyanometer's advantage is chart position (#197 vs unranked). On review sentiment, ads, in-app purchases and device support there is nothing between them.

RoadMaster 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, RoadMaster every 6 weeks. The most recent releases landed on September 22, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Cyanometer | RoadMaster |
| --- | --- | --- |
| 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** | 20.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 6 weeks** |
| Monetization | Paid | **Free** |
| Best chart rank | **#197** | — |
| Size | 14 MB | 36 MB |
| Requires iOS | 16 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jan-Hendrik von Kuick](https://appshunter.io/developer/1190145903) | [DTN Germany GmbH.](https://appshunter.io/developer/294631162) |

## What reviewers say

### Cyanometer

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

**Currently charting:** #197 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


### RoadMaster

[App page](https://appshunter.io/ios/app/roadmaster/id1495071095)

This service provides detailed road weather forecasts for winter maintenance operations. It offers real-time decision support data, alerts for slippery conditions, and precipitation type radar. Access detailed road conditions and hourly forecasts on the go.

**Highlights:** Detailed road weather forecasts, Real-time decision support data, Slippery condition alerts, Precipitation type radar, Animated satellite images, Hourly forecast tables and graphs

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Cyanometer free?

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

### Is RoadMaster free?

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

### Do Cyanometer or RoadMaster have ads?

Neither Cyanometer nor RoadMaster shows ads.

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

Cyanometer ships an update every 39 months, and RoadMaster every 6 weeks. Most recently, Cyanometer was updated on September 22, 2026 and RoadMaster on September 16, 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.*