Is it safe and efficient to spray right now?

Yes. The spray verdict, Delta T, humidity, dew point, drift risk, thermal inversion, wind and gusts, today's forecast, equipment and drone presets, checklists and — for aerial equipment — the Kp index and satellite cards are all free, with no ads and no account. Pro is an optional monthly subscription that adds multi-day planning, the hourly table, the field tools and the premium weather providers.

For the selected location and hour, PulveCast compares every parameter it has — Delta T, relative humidity, spray drift risk, thermal inversion, wind speed and gusts, temperature, precipitation, cloud cover, visibility and, for aerial equipment, Kp index and satellite count — against the limits configured for your equipment, crop and nozzle. If every parameter is within limits the verdict is "safe to spray". If one or more are close to a limit it is "spray with caution". If any parameter is outside its limit it is "do not spray", and the app names the parameter responsible.

Delta T is the difference between the dry-bulb and wet-bulb temperatures, and it predicts how fast a droplet evaporates. PulveCast uses 2 °C to 8 °C as the default ideal window: below 2 the air is nearly saturated and fine droplets stay airborne and drift; above 8 a significant share of the spray evaporates before reaching the target. The band is configurable, because the right range depends on droplet size and product.

It compares the forecast air temperature at 80 metres with the temperature at 10 metres, taking both values from Open-Meteo so the readings come from the same model and stay consistent. When the higher level is warmer than the lower one by more than the configured threshold — 1.5 °C by default — an inversion layer is likely, and the app flags it. Under an inversion the spray cloud does not disperse vertically and can be transported a long way off target.

Both. Choose the equipment type in the settings. The agronomic core — Delta T, humidity, dew point, spray drift, thermal inversion, wind and gusts — applies to every kind of equipment. Selecting ground equipment hides the aerial-only features (drone presets, RTK and GPS settings, Kp index and satellite cards) so the screen only shows what matters to you.

PulveCast ships presets for 17 agricultural models across DJI Agras, XAG, Hylio and TTA, including the Agras T10 through T100, XAG P100 Pro, P40 and V40, Hylio AG-130 and AG-230, and TTA G200 and M6E-1. The list is updated remotely, so new models appear without an app update. If your machine is not listed, choose the custom option and enter the wind and temperature limits from its manual.

Open-Meteo is the default provider and supplies the 7-day forecast, the wind profile by altitude and the 10 m / 80 m temperature pair used for thermal inversion. Pro subscribers can switch to WeatherAPI (3 days, completed with Open-Meteo) or Apple WeatherKit (up to 10 days, through a server-side proxy). The Kp index comes from GFZ Potsdam, satellite positions are computed from CelesTrak orbital elements, and the safezone map draws restriction zones over OpenStreetMap.

A forecast is a numerical model output for a grid cell, not a measurement at your headland. Wind especially varies over short distances near tree lines, buildings and terrain, and gusts are inherently hard to predict. Use PulveCast to choose the window and to catch the conditions you cannot see — inversion, Delta T, drift risk — and confirm wind and humidity on site before you open the boom.

Partly. The last forecast loaded for a location is cached on the device and shown with an offline badge, so you can still consult it in the field. Refreshing the forecast, the Kp index and satellite data requires a connection.

There is no account, no sign-in and no forum. Equipment, crop presets, thresholds, checklists, favourite locations, language and units are stored locally on your device. Location coordinates are sent to the weather providers to fetch a forecast and are not stored on our servers. Diagnostics are aggregated and anonymous. The privacy policy has the full detail.

Pro is an auto-renewable monthly subscription processed by Apple or Google. Eligible store accounts are offered an official one-month free trial by the store. It renews every month until you cancel it in your App Store or Google Play settings. Purchases are validated server-side, so Pro is tied to your store account and follows you to any device signed in with it — use "Restore purchases". There is no lifetime or one-time purchase.

No. PulveCast is distributed through Google Play and the App Store for Android phones and tablets, iPhone, iPad and Apple silicon Macs. This site is the product page, not the application.