Distributed PostgreSQL can be a game-changer for modern apps that demand constant availability, global access, and rapid response times. However, while many vendors today make claims about being "Postgres compatible" or "Postgres based," careful consideration should be given to the level of effort require to migrate application code and to what degree the product is outside the mainstream of the Postgres ecosystem. This guide outlines the six key considerations when evaluating a Postgres database as well as recommendations on how to assess what is right for your organization.