Pascal Barometer

Weather

Free · In-App Purchases

Track atmospheric pressure and predict weather changes using your device's built-in barometer. Pascal transforms your iPhone and Apple Watch into precision barometric instruments. Monitor pressure trends, receive storm warnings, and get weather predictions — all computed on-device with no internet required. FEATURES • Real-time pressure monitoring with 12-hour trend charts • On-device weather forecasting using the Zambretti algorithm • Storm alerts via push notifications • Live Activities showing pressure on Lock Screen and Dynamic Island • Flight mode with cabin altitude tracking • iOS widgets (small, medium, large) and Apple Watch complications • Hybrid calibration system for accurate readings PRIVACY FIRST All data stays on your device. No accounts, no cloud sync, no tracking. Location is used only for GPS altitude calibration and is never stored. TECHNICAL Pascal uses Apple's Core Motion framework to access the barometric sensor, delivering sub-Pascal resolution. The hybrid calibration system combines GPS altitude with relative altitude tracking to filter out elevation changes and surface true weather signals.

  • This app has not received enough ratings or reviews to display an overview.

Minor UI bug fix with the altitude display.

The developer, CHRISTOPHER JOHN DILLON, 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 Collected

    The developer does not collect any data from this app.

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

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

    Size
    • 4.6 MB
    Category
    • Weather
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • Apple Watch
      Requires watchOS 11.0 or later.
    Location
    • This app may use your location even when it is not open, which can decrease device battery life.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Provider
    CHRISTOPHER JOHN DILLON
    • CHRISTOPHER JOHN DILLON has identified itself as a trader for this app and confirmed that this product or service complies with European Union law.
    • Address
      27 St James's Park
      Ballymoney
      Antrim
      BT53 6FD
      United Kingdom
    • Phone Number
      +44 7510755356
    • Email
      pascal@christopherdillon.me
    Copyright
    • © 2026 Christopher Dillon