Roblox Studio is compatible with the Steam overlay, and you can bring this up in-game by pressing Tab and Shift. So, whether you're a creator or a player, you have your answer to whether Roblox is ...

To download Roblox on a PC, you need to be running Windows 7 or newer. The gaming platform is also available on Mac, iOS, Android, and Xbox One.

Roblox says it hasn’t blocked Linux or Steam Deck, but it’s reportedly toast there “Confirming there has been no change on our end to specifically block Linux or Steam Deck” ...