[thegrossman]

We chose it for forecast.io because of the input/output connotation. It is a concise way to imply "data service".

.io also allows us to use a short descriptive domain name. If we went with a .com, we'd be stuck with either something like forecastweatherapp.com, or a made up nonsense domain -- in which case we'd be basing the name of our app on the specific domain we were able to acquire.

[coin]

But I/O is the communications between devices. forecast.io is mostly about using vast amounts of weather data and then processing it to forecast weather. What does that have to do with I/O? I'd take your company more seriously if you had a .com name. Your current name makes me envision a junky spam site.

http://en.wikipedia.org/wiki/Input/output

[glitchdout]

The current name makes me envision an edgy, cool site.