: A recreation of Roblox Studio inside Roblox itself. It allows mobile users to build and even publish projects to their actual profiles using API keys.
If you absolutely need portability, look for a "Roblox Launcher" on GitHub with a high star count and recent commits. Never, ever download a portable .exe from a random YouTube description or a pop-up ad. That "Roblox Portable" is likely a one-way ticket to having your account phished. roblox portable
Ideally, "portable" means you can carry your games on a thumb drive. Roblox does not officially offer a "PortableApps" version. However, you can create a semi-portable experience. : A recreation of Roblox Studio inside Roblox itself