Apollo Sandbox is an open GraphQL IDE for local development that aims to make Apollo tools more accessible and valuable for every GraphQL developer. It offers a one-click query building feature in Explorer, allowing users to eliminate syntax errors and increase productivity. The tool also features an intelligent search field and path search (`⌘ + K`) to help navigate complex graphs with thousands of fields and types. Sandbox provides flexible response formatting options, including interactive JSON or table formats with collapsible sections and data sorting. Additionally, it allows users to explore and test their local GraphQL server without setup, and supports public endpoints for testing. The tool is open and accessible, requiring no login, but offers customization settings for logged-in users.