RainCatchRainCatch
Know exactly how many gallons the next rain will put in your barrel.
Download on the App Store
Screenshots
Features
Rainfall turned into gallons
Enter your roof catchment area, collection efficiency and tank size, and RainCatch converts the forecast into the water you can actually expect to collect.
Day-by-day fill forecast
See how the level climbs across the coming days, which day the barrel tops out, and how much runs to waste as overflow.
Overflow warnings before they happen
If a storm is going to fill you past capacity, you'll know in advance — in time to draw water down and keep every gallon you can.
Track what the garden drinks
Log each watering so your level stays honest. The forecast reflects what you actually use, not just what falls from the sky.
Compare tanks and roofs
Set up several barrels and catchment surfaces — house, garage, shed — and see which one earns its keep after the same rain.
Widget and no-location mode
Put the next expected collection on your Home Screen. Prefer to skip location? Type in the rainfall yourself and everything still works.
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.