The backbone of the online features for theis now available.
The app's release comes just two days before Splatoon 2 launches. Players working in teams online are going to be relying heavily on the app's voice chat and invite features via SplatNet 2.Splatoon 2 is the only supported title for the app at the moment.
The Nintendo app is free to download, and there's also no charge for Nintendo's online service until the end of the year. In 2018, the company will start charging a subscription fee of $20 a year.
To get the full scope of what else the app can do, check out GameSpot's coverage.