Username Search is an online tool for checking username availability across more than 520 social media platforms, websites, and services. It helps individuals and digital creators explore whether a preferred handle is available on platforms such as Instagram, TikTok, Twitter/X, and GitHub, supporting efforts to establish a consistent digital identity. The service describes its checker as fast, comprehensive, and privacy-focused, and says it does not store searches or personal information. Its website reports more than five million searches completed and a 99.9% accuracy rate.

Alongside username checking, Username Search offers a username generator and a brand name generator, plus guides and a directory of supported sites. The company also provides an API, with 20 free searches for registered users, and publishes pricing, API documentation, status information, and frequently asked questions. Users can sign in or get started through the site, while support is available for product updates, API questions, and enterprise requests. Username Search positions its services as practical tools for finding and developing an online identity.