So at one side we currently have the high-level Keras API, that let you easily build simple and advanced deep learning models, and the low-level TensorFlow framework that gives you more flexibility in building models. Both are backed by Google. As expected, the competition didn’t sit still and — in October 2017 — Microsoft and Amazon’s AWS jointly announced the Gluon API. Gluon is a high-level Python deep learning interface that wraps MXNet and soon it will also include Microsoft’s CNTK. Gluon is a direct competitor for Keras and although AWS claims that they strongly support all deep learning frameworks they, of course, bet on Gluon for the democratization of AI.