Subscription Model
Calm-like app and other similar mindfulness meditation apps earn through the subscription model. In this monetization model, users pay a fixed subscription fee for getting access to the advanced features.
In-App Purchase
Mobile apps like Calm allow users to pay for buying some services/products related to meditation from the platform itself.
By comprising this revenue model, you can generate significant revenue approximately equal to that of the Calm application. To surpass the meditation market, you will need an effective marketing strategy.