# This Blue — Measure the blue of the sky

> Digital cyanometer for measuring and collecting sky blueness. (iPhone/iPad app by Ben Strak.)

- Source: https://appshunter.io/ios/app/this-blue/id6742713449 (this page in markdown: same URL + `.md`)
- Developer: [Ben Strak](https://appshunter.io/developer/1799565528)
- Category: Lifestyle, Weather
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 18.2 · 19 MB
- Languages: American English
- Released: 2025-04-21
- Data updated: 2026-06-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/this-blue/id6742713449/reviews.md

## What is This Blue?

'This Blue' lets you measure and collect every blue sky you see. Inspired by Horace Bénédict de Saussure's 1789 Cyanometer, this modern interpretation brings the historic science of sky measurement into the digital age

FEATURES
• Measure the sky's blueness with precision using your device's camera
• Beautiful interactive 52-shade color wheel inspired by the original 1789 Cyanometer
• Save and collect your sky measurements with time and location
• Share your sky colors with custom-designed share cards
• Elegant, minimalist interface with scientific aesthetics
• Haptic feedback for extra fun

HOW IT WORKS
Point your device skyward, and This Blue will analyze the colour using advanced LARB matching algorithms. The colour wheel will automatically rotate to match the sky's blueness, giving you an accurate measurement on the 52-point scale.

Tap the camera button to capture a particular shade of blue and start building up a collection of different blues. When you find a blue you want to share a share, tap the share button to create a beautiful card with a personalised message that you can send through a messaging app or social media network.

Perfect for:
• Weather enthusiasts
• Photographers
• Science lovers
• Artists
• Nature observers
• Anyone curious about the sky above us

## Key features

- Measure sky blueness with camera
- Interactive 52-shade color wheel
- Save sky measurements with time/location
- Share sky colors with custom cards
- Minimalist interface with scientific aesthetics
- Haptic feedback


## Frequently asked questions about This Blue

### How does This Blue measure sky blueness?

This Blue uses your device's camera and advanced LARB matching algorithms to analyze the sky's color. The app then matches this color to a 52-point scale on an interactive color wheel.

### Can I save my sky measurements with This Blue?

Yes, you can save each sky measurement along with the time and location it was taken. This allows you to build a collection of different sky blues you've observed.

### How can I share my sky colors with This Blue?

You can share your captured sky colors using custom-designed share cards. These cards can be personalized with a message and sent through messaging apps or social media.

### What is the inspiration behind This Blue?

This Blue is inspired by Horace Bénédict de Saussure's 1789 Cyanometer, a historic scientific instrument used to measure the blueness of the sky. This app brings that concept into the digital age.

### What devices does This Blue support?

This Blue is currently supported on iPhone devices. The app was last updated on February 6, 2026, with version 1.1.0.

### What is the age rating for This Blue?

This Blue has an age rating of 4+, making it suitable for a wide range of users. The app is free to download and use.

### Does This Blue have ads?

No, This Blue is ad-free. The app is completely free to download and use, with no advertisements to interrupt your experience.

### What is the user sentiment for This Blue?

Based on the available data, user sentiment appears to be very positive, with a rating of 5.0 stars from 1 rating. This suggests users find the app highly satisfactory.

## Version history (last 2 releases)

### 1.1.0 — 2026-02-06

Updated with general usability improvements and for iOS 26 Liquid Glass.

### 1.0 — 2025-04-21

No release notes.

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## Related topics

[blue sky nm](https://appshunter.io/ios/topics/blue-sky-nm)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-07.*