RainCatchRainCatch
Know exactly how many litres the next rain will put in your rain barrel.
Download on the App Store
Screenshots
Features
Rainfall turned into litres
Enter your roof catchment area, collection efficiency and barrel capacity, and RainCatch converts the forecast into the water you can actually expect to collect. Gallons work too if you prefer them.
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 litre 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 barrels and roofs
Set up several barrels and catchment surfaces — house, garage, shed — and see which one really earns its keep after the same rainfall.
Widget and no-location mode
Put the next expected collection on your Home Screen. Prefer to skip location? Enter the rainfall yourself and everything still works.
Know what the next rain will add to your tank.
RainCatch turns a daily precipitation forecast into a practical estimate for your rain barrel or water tank. Enter roof catchment area, collection efficiency, tank capacity, and current level to see estimated liters or gallons, the level after rain, and overflow.
• Plan collection across a 7-day forecast
• Track each tank and roof catchment
• Record water used in the garden
• Calculate from manual rainfall without location
• Use metric or US customary units
• See the next collection in a Home Screen widget
• No account, advertising, or analytics
Designed for planning non-potable outdoor water use. Actual collection varies with roof shape, gutters, debris, wind, and local conditions.