"YT Studio" is the official analytics and management app for YouTube creators. Version numbers are typically sequential (e.g., 23.xx, 24.xx). A "511 version" likely refers to a specific build (e.g., 5.11.xxx or a beta release). Because version numbers change frequently, always verify the exact numeric code (e.g., 5.11.0 or 511000xxx ) before downloading.
For those just getting started, YouTube Studio (formerly Creator Studio) is the official app from Google. It allows creators to manage their channels from their mobile devices. Key features include: