Big Data introduces a significant increase of complexity to projects, in which, the use of inadequate data will inevitably produce inadequate and incorrect analysis. Data Catalogs centralize the system’s metadata into one place, providing a global view of the stored data, so it is essential to use appropriate data catalog tools. The choice of the tool that best suits the needs of the projects must be well-founded. This paper uses the OSSpal methodology, usually used for comparing open-source technologies, to do a comparative analysis of two tools: DataHub and Apache Atlas.