Roblox Register is an independent online record of Roblox groups and users, not affiliated with, endorsed by, or sponsored by Roblox Corporation. It measures group data directly from public Roblox APIs, rather than relying on self-reported figures or estimates, and preserves historical records for users to explore.

The register tracks measured member counts over time, group ownership transfers, renames, and deleted groups. Visitors can search and browse groups using charts and directories covering measures such as size, age, verification, growth, and topic. The site also features recently measured groups, notable changes, breakouts, rebrands, archives, statistics, and a register of measured users. Additional resources include downloads, API access, data feeds, and information about its measurement methods and safety records.

Roblox Register presents its counts as rows it has directly measured, with coverage statistics indicating the scale of its records. Its purpose is to make Roblox group activity easier to examine through independent data, historical context, and searchable public-facing tools.