This free app accompanies the book Life with Full Attention, written by Maitreyabandhu. You can follow the course on your own, or find a live group course at your local Triratna Buddhist centre. For more details, see the book page here:
https://www.windhorsepublications.com/product/life-with-full-attention-a-practical-course-in-mindfulness/
and the App page here:
https://www.windhorsepublications.com/lwfaapp/