Yeah, I would agree that in that sense, React is a framework. You call ReactDOM.render(), but from there it instantiates your components and calls their lifecy

Yeah, I would agree that in that sense, React is a framework. You call ReactDOM.render(), but from there it instantiates your components and calls their lifecycle methods as appropriate. On the flip side, it's nowhere near as all-encompassing as Angular or Ember. No built-in AJAX handling, no complex data model manipulations, no preferred project architecture. So in that sense, it's much closer to the library side of things.