This Blue
Measure the blue of the sky
About
Measure the exact blueness of the sky using your device's camera. Collect and save your sky measurements with time and location, and share them with custom cards. This app offers a modern digital interpretation of historic sky measurement science.
What's New in This Blue
1.1.0
February 6, 2026
Updated with general usability improvements and for iOS 26 Liquid Glass.
FAQ
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.
