This Blue

Measure the blue of the sky

Only for iPhone

Free · Designed for iPhone

iPhone

'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

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

Version 1.1.0

The developer, Ben Strak, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Location
    • User Content
    • Identifiers
    • Usage Data
    • Diagnostics

Privacy practices may vary based, for example, on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

  • Provider
    • Ben Strak
  • Size
    • 19.8 MB
  • Category
    • Lifestyle
  • Compatibility
    Requires iOS 18.2 or later.
    • iPhone
      Requires iOS 18.2 or later.
    • Mac
      Requires macOS 15.2 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 2.2 or later.
  • Languages
    • English
  • Age Rating
    4+
  • Copyright
    • © Benjamin Strak
  • Privacy Policy

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