YouTube TV allows streaming on up to 3 devices simultaneously per subscription. This means you can watch YouTube TV on three different TVs, computers, or mobile devices at the same time under one account

. If you want to increase this limit, YouTube TV offers an option to add more streams for an additional fee of about $10.99 per month, which adds 4 more simultaneous streams, allowing up to 7 simultaneous streams in total

. Key points:

• You can be logged into YouTube TV on many devices, but only 3 can stream at once by default

• The 3-stream limit applies regardless of location, and streaming on multiple devices in different locations is generally not allowed beyond this limit

• YouTube TV supports a wide range of devices including smart TVs, streaming devices (Roku, Chromecast, Apple TV), smartphones, tablets, and computers

In summary, without any add-ons, you can watch YouTube TV on 3 TVs or devices simultaneously. With an additional subscription add-on, this can increase to 7 simultaneous streams.