Bottle uses one process-wide application object. Flask supports initializing multiple application objects (such as for testing the app with different configurat

Bottle uses one process-wide application object. Flask supports initializing multiple application objects (such as for testing the app with different configurations). Flask is built on top of the feature-rich Werkzeug library, which can significantly reduce the amount of code you must write for more complex applications. It is straightforward to refactor Flask out of your code and use Werkzeug directly. Flask has a growing community of contributors. See the extensions library: http://flask.pocoo.org/extensions/ http://flask.pocoo.org/extensions/ In a nutshell, Bottle is suitable for very simple websites. Flask has what it takes to grow into a large site.