VPD Tool is made and published by Nicholas Hwang. AppBrain is an independent app data site and isn't affiliated with Nicholas Hwang. The app name, icon, screenshots and description belong to Nicholas Hwang and are shown as published on the App Store.
AppBrain's verdict
- Rating on App Store
- 5.00
- 1 ratings
- Last updated
- May 10, 2026
- Size
- 1.67 MB
It doesn't have enough ratings yet to judge what users think.
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Store listing
By Nicholas Hwang, from the App Store
Description by Nicholas Hwang Written by the developer, not by AppBrain. Click to read.
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
Safety and technology
Found in the app by AppBrain- Price
- $0.49
- App size
- 1.67 MB
- Content rating
- Everyone
Technologies used by VPD Tool
Releases
Updates seen on the App Store- Version
- 1.0.5
- Launched
- August 2025
No changelog data
Alternatives
Similar apps and more from Nicholas HwangMore from Nicholas Hwang
Rankings
App Store top chartsApp Store Rankings for VPD Tool
About the app and developer
About VPD Tool
VPD Tool is an utilities app developed by Nicholas Hwang.
User Ratings
VPD Tool is rated 5.00 out of 5 stars. The rating is based on one rating ratings.
App Information
VPD Tool costs $0.49. The app size is 1.67 MB. The latest version available is 1.0.5. The last update was on May 10, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on the App Store since August 2025.
Developer information for Nicholas Hwang
Address:
Frequently asked questions about VPD Tool
Is VPD Tool free?
No. VPD Tool costs $0.49 on the App Store.
Is VPD Tool still available?
Yes. VPD Tool is on the App Store, and the last update we saw was on May 10, 2026.
How large is VPD Tool?
VPD Tool is 1.67 MB.
Is VPD Tool suitable for children?
App Store rates the content of VPD Tool as suitable for everyone.
How do people rate VPD Tool?
VPD Tool has one rating of 5.00 stars on the App Store.
Who made VPD Tool?
VPD Tool was developed by Nicholas Hwang. It is listed in the utilities category on the App Store.