How do Headspace and Calm differ within the mindfulness app market?

How do Headspace and Calm differ within the mindfulness app market? What would be the positioning
statements be for the two brands? How have their various marketing and product decisions reinforced or
degraded their respective positioning?
What are the pricing structures of the apps? What do you think they are trying to achieve, and are they
successful?
What growth strategies do Headspace and Calm seem to be engaging in?
What do you think will be the biggest challenges for Headspace and Calm moving forward in terms of retention
and growth?