WhoUsesThat is a directory for exploring documented relationships between companies, vendors, products, software, equipment, and services. Its searchable listings help users identify organizations recorded as using a provider’s offering, explore vendors and technologies associated with an organization, and research adoption of particular systems or services. The site organizes records across categories such as architecture, business intelligence, customer relationship management, cybersecurity, enterprise resource planning, human resources, manufacturing execution, marketing automation, and warehouse management and automation.

Each relationship listing presents a customer or organization, provider, product or service, category, evidence status, and a link to its source. Evidence labels include vendor-listed, documented implementation, announced selection or implementation, documented pilot, service, or project. Search and filters allow visitors to refine results by category, evidence status, current-use status, organization type, and location. WhoUsesThat emphasizes checking the evidence for its dates, scope, and current-use status, and notes that its records are not complete customer or supplier lists. The growing directory includes sourced and community-submitted records, with policies covering evidence, contributions, privacy, and use.