When you use a smart phone or an app in your meditation, look closely at your intention. Are you trying to feel good or are you trying to find out what is fundamentally true? The companies that are trying to sell you something will find out what makes you feel good and market that. If you have an app that tells you how you are doing or measures your progress, it robs you of your own intelligence, covering up what you may need to see.

https://www.youtube.com/watch?v=wzCwvaRXz4I