Rainy Days is a doppler rain radar app designed for iPhone users, offering fast and accurate precipitation tracking. With Rainy Days, users can pan and zoom to observe incoming storms with detailed precision, allowing them to stay ahead of changing weather conditions. The app focuses on local weather, utilizing multiple data sources to provide up-to-date radar images specific to the user's location and zoom level.

Unlike other weather apps that use a single global map, Rainy Days leverages actual radar doppler data and switches to satellite-based data only in regions lacking doppler radar coverage. The app covers a wide range of regions including the US, Canada, Europe, Australia, and Africa. Users can request additional coverage areas for potential future updates.

Rainy Days is ad-supported, but users have the option to disable ads through a one-time in-app purchase, enhancing their experience with uninterrupted radar tracking.