How do I cite a work streamed through an app?

If you access a work through an app, consider the app a version according to the MLA format template. The version may be a number, such as 1.3.1, as in the first example, from page 39 of the MLA Handbook. Or it may be a name, such as Netflix, as in the second example below; add the word app if clarification is needed:

Shakespeare, William. The Tragedy of Othello. Edited by Barbara Mowat and Paul Werstine, version 1.3.1, Luminary Digital Media, 2013.

The Crown. Netflix app, Left Bank Pictures / Sony Pictures Television Production UK, 2016.