Honestly I don’t remember. I had a gen 1 Chromecast as well and I think it was just a Chromecast app. Now it’s all integrated with Google Home.

Edit: I tried googling it and under the Wikipedia page description it showed the following. But what’s funny is if you go to the Wikipedia page, that text is no longer there.

Originally called simply “Chromecast”, the app was released concurrently with the original Chromecast video model …