How much effort to create a weather app for ios or andriod that works like this?...

danny8000 88 days ago | parent | context | favorite | on: Visualizing Weather Forecasts Through Landscape Im...

How much effort to create a weather app for ios or andriod that works like this? Maybe so something for the nest home max or echo show? I love the idea, but what is the easiest way to get this onto the most number of devices?