I have been meditating a long time. I think it's best to start with NO app. Set a timer for 2 minutes. Still as still as you can. Stop when the timer goes off. When that is easy, increase the time to 3 minutes until you get to 10 or 15 minutes. The key to beginning meditation is to be as still as possible. With your mind still your body will begin to follow. Once you have conquered stillness, it is easier to let the thoughts pay by as you notice them but dont obsess on them or do more guided types of meditation. Physical stillness first and the mind will follow.
I am only using downloaded video from YouTube and i believe is just not about the application but our mindset. If mentally we are ready to experience something new, we should be able to focus well.