<i>&gt;Unlike [my perception of] React or Angular, you can use Polymer a bit without going all in.</i><p>For what it’s worth, you can integrate React in your existing Backbone&#x2F;Ember&#x2F;Angular&#x2F;etc app one component at a time. At my previous company, we have been doing this over the course of a year while shipping new features thanks to the interactivity React enabled.<p>Ryan Florence gave a talk about integrating React into an existing app: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=BF58ZJ1ZQxY" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=BF58ZJ1ZQxY</a>