VPD Tool

Vapor Pressure Deficit Heatmap

QAR 1.99 · Designed for iPad

Know your VPD in seconds. Enter temperature & humidity (or tap the interactive heatmap) to see Leaf VPD and Air VPD with scientifically labeled isolines. Choose Seedling / Veg / Flower / Late Flowering to see target VPD ranges and how best to nudge your environment to “ideal.” Why growers love it • Interactive heatmap: drag to explore temperature–humidity combos • Stage presets: recommended VPD bands by plant development stage • Leaf vs Air: leaf–air offset, dew point, absolute humidity • Beautiful widgets: small/medium/large Home & Lock Screen widgets • Private by design: on-device calculations, no account required Details • VPD = es(T) × (1 − RH/100); leaf VPD uses leaf temperature (air + ΔT) • Absolute humidity via water vapor partial pressure (ideal gas law) • Full support for °C/°F, metric/imperial • Export logs to CSV Support Questions or feedback: support@nicksberryfarm.com

Ratings & Reviews

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General Improvements • Chart text color now matches the user defined cursor color. • The charting pipeline now utilizes Leaf-Referenced VPD. By accounting for leaf temperature offsets, this metric better reflects the true vapor pressure gradient driving transpiration.

Version 1.0.3

The developer, Nicholas Hwang, 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

    Accessibility

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

    Information

    • Provider
      • Nicholas Hwang
    • Size
      • 1.7 MB
    • Category
      • Utilities
    • Compatibility
      Requires iOS 18.5 or later.
      • iPhone
        Requires iOS 18.5 or later.
      • iPad
        Requires iPadOS 18.5 or later.
      • Mac
        Requires macOS 15.5 or later and a Mac with Apple M1 chip or later.
      • Apple Vision
        Requires visionOS 2.5 or later.
    • Languages
      English and 5 more
      • English, French, Japanese, Portuguese, Spanish, Traditional Chinese
    • Age Rating
      4+
    • Copyright
      • © Nicholas Hwang
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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