RainCatch RainCatch

Know what the next rain will add to your tank. RainCatch turns a rainfall forecast into a practical estimate for your rain barrel or water tank. Add your roof catchment area, collection efficiency, tank capacity, and current level to see how many liters or gallons you can collect, when the tank may fill, and how much water may overflow. • Forecast rainwater collection by day • See expected tank level and overflow • Track water used for your garden • Compare several tanks and roof catchments • Home Screen widget for the next expected collection • Metric and US customary units • Optional location-based forecast • Manual rainfall mode works without location • No account, advertising, or analytics Estimates are intended for planning non-potable outdoor water use. Actual collection varies with roof shape, gutter losses, debris, wind, and local conditions.