Too small, 4k gzipped. No dependencies, plain vanilla JavaScript. Plug & Play and Isomorphic. Runs on most browsers. You don't need to install Node.js ecosystem on your computer. Query merging to reduce request number. GraphQL is based on a very simple HTTP transaction, which sends a request to an endpoint with query and variables. Many libraries require complex stacks to make that simple request. In any project you don't use React, Relay, you'll need a simpler client which manages your query...