Primarily, Nevada online sports betting is app-only. It’s important to note a few key differences between states when betting using the Circa sportsbook app or the website. Bettors of legal age in Nevada can visit the Circa sportsbook in-person in Las Vegas, or download the Circa Sports app. Bettors of legal age in Colorado and Iowa can download and play using the Circa sportsbook app or by visiting the Circa website. The Circa sportsbook app is available in three incarnations as of late 2021, with plans to expand further into the growing US sports betting market.