Visualize VPD. Dial in your grow.

VPD Tool turns temperature & humidity into a live, interactive heatmap. Tap the chart or nudge values to see how far you are from the ideal range for each growth stage. Gorgeous widgets keep it handy on your Home Screen.

Download on the App Store See features

Seedling • Veg • Flower • Late Flower • On-device privacy

VPD Tool heatmap and widgets screenshot (placeholder) — Interactive heatmap

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Interactive Heatmap

Tap or drag across Temperature × Humidity to see VPD and stage-relative guidance, with readable isolines.

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Pro Widgets

Small, Medium, and Large widgets with quick +/– controls, stage selector, and a miniature heatmap.

Small & Medium widgets shown. Tap to adjust Temp/RH.

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Private by Design

No accounts. Data stays on your device (and in iCloud if you enable it). CSV export when you want it.