You can read all about the Courtney Black App here: https://www.courtneyblack.co.uk/courtney-black-fitness-ap
The prices at the time of writing are
1-month rolling subscription - £15.99 a month rolling
3-month rolling subscription - £39.99 quarterly rolling
6-month rolling subscription - £64.99 bi-annually rolling
1-year rolling subscription - £119.99 a year rolling