YouTube TV allows streaming on up to three devices simultaneously with its base subscription plan. This means three people can watch YouTube TV at the same time on different devices under one account

. Additionally:

• You can create up to six user profiles per account, which helps personalize recommendations and DVR settings for different family members, but this does not increase the number of simultaneous streams beyond three

• The account can be shared with up to five additional people living in the same household, but the three-device simultaneous streaming limit still applies unless upgraded

• YouTube TV offers a 4K Plus add-on that removes the three-stream limit for devices connected to your home Wi-Fi, allowing unlimited simultaneous streams at home. Outside the home, the limit remains three streams

• You can register the YouTube TV app on many devices (up to 30 per year), but only three can stream at once on the base plan

In summary:

Plan Type| Simultaneous Streams Allowed| Notes
---|---|---
Base Plan| 3| Up to 3 devices streaming at once
4K Plus Add-on Plan| Unlimited (on home Wi-Fi)| Unlimited streams on home network; 3 outside home

So, with a standard YouTube TV subscription, three people can watch at once , and with the 4K Plus add-on, unlimited people in the same home network can watch simultaneously