Definition
Concurrent viewers (also called peak concurrent viewers or live viewers) is the number of people watching a live stream at the same moment in time. It is the primary metric for measuring live stream performance on platforms like Twitch and YouTube Live. High concurrent viewership signals strong real-time audience engagement and is used by brands to evaluate sponsorship value for live stream integrations. Concurrent viewer counts are publicly visible on most platforms, making them a key social proof metric for live creators.