Ever hear of a book? Traditionally, they are far better than an app, and in many ways better than a human teacher at your side. Meditation is one case where a book is probably the best guide. Speaking as a Transcendental Meditation practitioner for over 40 years, started in 5th grade back in '76. My Iowa church and school freaked and even tried to claim my meditating was a satanic influence on other kids... If it's not Satan it's Capitalism fucking with meditation. Why are people so tribal stupid?