# VPD Chart — Democratization of VPD > Calculates and visualizes Vapor Pressure Deficit (VPD) for plant growth. (iPhone/iPad app by INNOVO DEV S.R.L..) - Source: https://appshunter.io/ios/app/vpd-chart/id6470015847 (this page in markdown: same URL + `.md`) - Developer: [INNOVO DEV S.R.L.](https://appshunter.io/developer/1814828527) - Category: Utilities, Productivity - Price: Free with in-app purchases (on sale, was $0.99) - Rating: 4.50/5 from 30 App Store ratings · 19 written reviews indexed - Age rating: 4+ - Requires: iOS 15.1 · 49 MB - Languages: American English - Released: 2023-12-08 - Data updated: 2026-09-08 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/vpd-chart/id6470015847/reviews.md ## What is VPD Chart? The app calculates VPD using air temperature, relative humidity, and canopy temperature. View real-time VPD values on an interactive chart. Connect sensors for automated readings or manually input data via intuitive sliders and text inputs. Key features: • Interactive VPD chart with manual input • Default crop types • Organize charts by assigning them to different zones • Display spots that share the same VPD value • Zoom in and out of the VPD chart with a two-finger pinch and drag to pan around • VPD Target - long-press the chart to set a target VPD value • Dew point area visualization • Grow Timeline • Sync sensor historical data by importing it from sensor's app, via cloud APIs, or bluetooth • Explore sensor history by panning and zooming Supported bluetooth devices: • AC Infinity Cloudcom B2, A2, B1 • SensorPush: HT1, HT.w, HT.xw • Govee: H5051, H5072, H5074, H5075, H5100, H5101, H5102, H5103, H5104, H5105, H5174, H5177, H5179 • SwitchBot: Meter, Plus, Indoor Outdoor • Ruuvi: RuuviTag and RuuviTag Pro • Inkbird: IBS-TH1, IBS-TH1 Plus, IBS-TH2, IBS-TH2 Plus • ThermoPro: TP351, TP357, TP358, TP359 • VIVOSUN AeroLab THB1S • Shelly BLU H&T • Xiaomi Mijia 2 (LYWSD03MMC) (original and pvvx firmware) Supported devices with API connectivity: • Govee • Pulse • UbiBot • Ecowitt • Tuya • SensorPush Educational benefits: • Interactive Learning: Explore the dynamics of VPD based on changes in temperature and relative humidity by manipulating input sliders and animating the chart • Canopy - Air Temperature Link: Easily visualize and set values by linking canopy temperature to air temperature • Chart Bands Control: Toggle chart bands on/off (dew, under transpiration, prop, veg, flower, over transpiration) for a comprehensive understanding Included: 1 chart with manual input and grow timeline, device data sync & explore, default crops VPD Chart Plus subscription unlocks: • Unlimited charts • Automated VPD calculation by using sensors as the input data source • Background monitoring and Alerts (temperature, RH, VPD) • VPD history timeline, available on sensor-driven VPD charts • Custom crops Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Key features - VPD calculation - Interactive VPD chart - Sensor integration - Zone organization - Dew point visualization - Grow Timeline ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | VPD Chart Plus (monthly) | $3.99 | per month | | VPD Chart Plus (annual) | $29.99 | per year | ## Recent user reviews (10 of 19) All indexed reviews: https://appshunter.io/ios/app/vpd-chart/id6470015847/reviews.md ### 5/5 — I use this app everyday! *2025-08-11* This is such a great little app with updates that provide useful improvements with a simple elegant layout to track VPD in realtime. I track over eight G hydrometers at times and it reads sensors simultaneously no problems. Great work, thank you! **Developer response:** Thanks for your message! You're a heavy user with eight devices. ### 5/5 — So far so good. 1 suggestion *2025-07-25* Just a suggestion for the developers, add support for WiFi hygrometers, such as ones from the brand Govee and whatnot. I had no issues connecting to my bluetooth Govee hygrometers, but the WiFi version is unavailable **Developer response:** Starting with version 2.0.6, you can connect to Govee devices via API. Check it out ### 4/5 — Working nicely *2025-06-21, version 2.0.3* Working nicely. Unfortunately no support for my x351 Version of ThermPro ### 1/5 — Update requires pay *2025-06-14* What was once a very reliable tool has now become a cash grab. To use Bluetooth sensors, (which was free before today) to check temperatures now, is no longer free. Thanks for memories **Developer response:** Edit: The issue has been fixed in version 2.0.3 If you paid for the app, you should have access to all the features that were available at the time of your purchase. There’s currently a bug in the latest release affecting this, and we’re working on a fix. Please drop us a line at hello@vpdchart.com so we can follow up with you and make sure everything works properly after the update. Thank you! ### 5/5 — Great with Govee *2025-01-02* Works great, I wish Govee made there app as simple and useful, seriously. Highly recommended this app even if you don’t use the Bluetooth connection. If you could add a logging feature to track trends and records it would be 6stars. Thank you. Update: The recent update was a great improvement. It updates smoother and repopulates the list with no problems shining different sensors. **Developer response:** Thanks for your message! Consistent logging would require the app to always run in the background. However, this is not possible due to iOS app optimization limitations. ### 5/5 — Top *2024-12-28, version 1.1.0* I love it, helps a lot ### 5/5 — Must have *2024-12-22* Works great with the inkbird ### 1/5 — Teuer & funktioniert nicht *2024-11-07, version 1.0.6* Seit über 3 Stunden empfange ich keine Daten, obwohl die Sensoren (in anderen Apps) normal laufen. Ein manuelles „Refresh“ ist leider nicht möglich. Auch ansonsten zu teuer für den geringen Funktionsumfang! 👎 ### 4/5 — Good app for vpd *2024-11-07* I've used several apps for vpd and this one is as good if not better than the others I use. I really like how you can use sensors to find the vpd instead of using numbers. ### 4/5 — Good app for vpd *2024-10-27* I've used several apps for vpd and this one is as good if not better than the others I use. ## Frequently asked questions about VPD Chart ### What does the VPD Chart app do? The app calculates Vapor Pressure Deficit (VPD) using air temperature, relative humidity, and canopy temperature. It provides an interactive chart to view real-time VPD values, allowing users to understand and manage plant growth environments. ### What are the key features of VPD Chart? Key features include an interactive VPD chart with manual input, default crop types, the ability to organize charts by zones, visualization of dew point areas, and a Grow Timeline. It also supports integration with various Bluetooth and API-connected sensors. ### How much does VPD Chart cost? The app offers a free version with one chart and default crops. A 'VPD Chart Plus' subscription unlocks unlimited charts and automated VPD calculation using sensors, as well as custom crop options. ### What devices are compatible with VPD Chart? The app supports a wide range of Bluetooth sensors from brands like SensorPush, Govee, SwitchBot, Ruuvi, Inkbird, ThermoPro, VIVOSUN, and Shelly. It also supports API connectivity for certain Govee, Pulse, UbiBot, and Ecowitt devices. ### How can I use VPD Chart for educational purposes? The app facilitates interactive learning by allowing users to manipulate input sliders for temperature and humidity to see how VPD changes on the animated chart. It also helps visualize the link between canopy and air temperature, and offers chart band controls for a comprehensive understanding of different growth stages. ## Version history (last 5 releases) ### 3.4.0 — 2026-09-01 More AC Infinity sensors: the Cloudcom A2 and Cloudcom B1 now work over Bluetooth, including syncing the history stored on the device. Also new: • Support for the latest Cloudcom B2 hardware revision • App now available in Thai ### 3.3.0 — 2026-08-08 New Scan tab: take a photo of any hygrometer and VPD Chart reads its display for you (beta). Also new: • AC Infinity Cloudcom B2 over Bluetooth • SensorPush via the G1 Gateway • Sync stored history from Govee and AC Infinity sensors • Tuya: Singapore region added • Sync and import moved onto the sensor screen • Crops moved into the Charts header Happy growing! ### 3.2.0 — 2026-06-10 The app is now fully localized! VPD Chart is available in English, German, Spanish, French, Italian and Portuguese (Brazil and Portugal). Also improved: • Refined chart legend and chart settings • Various interface fixes Happy growing! ### 3.1.3 — 2026-05-19 • Reversible humidity axis - flip the RH axis direction to match your preferred orientation • Pinch to zoom and pan - explore any part of the chart at any scale • Zoom-aware detail - grid lines and VPD values appear once you zoom in past a certain level, keeping the chart clean when zoomed out • VPD Target - long-press the chart to set a target VPD value and see which temperature and humidity combinations achieve it ### 3.1.2 — 2026-05-05 • Tuya devices integration via API ## Apps similar to VPD Chart | App | Rating | Price | Category | | --- | --- | --- | --- | | [Theengs BLE](https://appshunter.io/ios/app/theengs-ble/id6443457651) | — | $3.99 | Utilities | | [AWN CropAI](https://appshunter.io/ios/app/awn-cropai/id6744830192) | 5.0 (3) | Free | Utilities | | [WirelessTag](https://appshunter.io/ios/app/wirelesstag/id508973799) | 4.6 (183) | Free | Utilities | | [VuSitu](https://appshunter.io/ios/app/vusitu/id1448937574) | 4.9 (16) | Free | Utilities | | [PROBE PLUS](https://appshunter.io/ios/app/probe-plus/id6449171085) | 1.5 (113) | Free | Utilities | | [EDEN Water Timer](https://appshunter.io/ios/app/eden-water-timer/id1439855140) | 1.8 (21) | Free | Utilities | ## Related topics [vpd chart](https://appshunter.io/ios/topics/vpd-chart) · [vpd vapor pressure calculator](https://appshunter.io/ios/topics/vpd-vapor-pressure-calculator) · [vpd](https://appshunter.io/ios/topics/vpd) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-08.*