GrowVPD Pro is a VPD calculator and VPD chart in one, with a grow diary, a plant problem guide and smart device automation. Enter temperature and humidity, or connect a sensor, and see the vapor pressure deficit with leaf-temperature correction. No account, no ads. Most features are free and will stay free.

🌱 VPD CHART, TABLE AND CALCULATOR
The VPD table colors the target zone for every stage — seedling, veg, flower and drying — so you know whether to raise or lower the humidity in your grow tent. Altitude adjustment, °C/°F toggle and live data from Bluetooth sensors.

🔬 PLANT PROBLEM GUIDE
Gallery of 41 diseases, deficiencies, and pests with symptoms, hand-drawn botanical plates, and specific treatments. Fully offline.

📓 GROW DIARY
Entries from seed to harvest — temperature, humidity, VPD, pH, EC/PPM, PPFD, height, watering, nutrients, photos, and video. Harvest records with wet and dry weight per plant and yield efficiency (g/watt, g/plant). Side-by-side comparison of multiple grows, automatic grow age tracking, strain lineage.

🤖 SMART AUTOMATION
Rules based on VPD, temperature, humidity, CO2, PPFD, soil moisture, and water level. Thirteen phase presets from seedling through veg and flower to drying and curing, hysteresis, gradual light sunrise, and emergency override. Cross-brand automation — any sensor can trigger any outlet, air conditioner, or fan.

🔌 YOUR DEVICES IN ONE APP
• Local control where the device supports it: Tuya WiFi (v3.3-v3.5) — outlets, air conditioners, dehumidifiers, lights, and fans, controlled directly over your home network.
• Cloud Bridge for cloud-only-by-design devices: AC Infinity, Spider Farmer, Vivosun, Bluelab — a secure connection through the manufacturer's cloud.
• MQTT and BLE: Mars Hydro (BLE pairing + Wi-Fi/MQTT control), Tuya Zigbee hub with battery-powered sensors, BLE temperature/humidity sensors.
• Phone as hub: an old Android (version 7+) in a charger becomes a continuous grow-room guardian 24/7.
Tuya WiFi and Zigbee, Mars Hydro, and Bluetooth sensors are verified on real hardware. Other platforms (AC Infinity, Spider Farmer, Vivosun, Bluelab, SANlight) are being actively tested and expanded.

🔄 MULTI-DEVICE SYNC
Pair phones and the GrowVPD Desktop Hub by QR code. Diary entries, photos and rules stay in sync, end-to-end encrypted — over your local network or our encrypted relay.

💡 PPFD / DLI METER
Lighting recommendations by growth phase and light schedule, dynamic DLI calculation, and a PPFD meter that reads the phone's ambient light sensor. Try it with three free measurements; unlimited with Pro.

🧮 CALCULATORS AND TEMPLATES
Nutrient dosing, substrate mixing, living soil, yield estimation, and airflow calculation (CFM). 20 ready-made grow templates with weekly temperature, humidity, and light targets.

🛠 EQUIPMENT AND NUTRIENT DATABASE
223 products from 46 brands — lights, tents, ventilation — and 287 nutrient products. A setup assistant calculates power draw, airflow, and tent coverage.

🔒 PRIVACY
Data stays on your phone. PIN or biometric lock, hidden photos from the device gallery, stealth mode. Green light turns the display into a safe light for nighttime plant checks.

🌍 11 LANGUAGES
Czech, English, German, Spanish, Dutch, French, Italian, Portuguese, Polish, Thai, and Hebrew.

The app is free and genuinely usable without paying — VPD chart, calculators, diary, templates, disease gallery and device automation, all without ads. The free tier covers 1 grow, 1 tent, 3 devices and 1 automation rule; Pro lifts those limits and adds the PPFD/DLI meter, diary video, the full archive and more tools.

Built by a small team of growers and developers — actively maintained and shaped by your feedback. From growers, for growers. 🌿