Hi. First, let me publically thank Muse for making their app accessible in the latest version. The original Calm app was 100% unusable, and the new app is almost perfect when used with Voiceover, the screen reader built into iOS. I wish all developers were this conscientious and adaptable.
There are still some wrinkles, but certainly nothing that stops me from using the app. Great job!
That said, this is just a polite note to you all to please consider users who are blind when developing your own third-party iOS apps. Your device already has Voiceover included as part of the OS, and I encourage you to give it a spin.
Here is a page listing various iOS accessibility resources.
Thanks for considering this aspect of development.