A:Answer I believe it's WebOs 3.0 or higher. I have a 65" LG I bought late 2016 and wanted to install the Disney+ app but the Os didn't support Disney's requirements it had to be 3.0 or higher, thus the spp wasn't available on their app store. But this TV has the latest Os installed and the TV is great. I also purchased it because it was recently released Oct 2019, versus some of the lesser LG's available that are early 2018.