I have tried several meditation apps and in my experience Harmony is by far the best, the only one that allows me to reach a deep hypnotic state versus just relaxation; I believe that accessing the subconscious mind has to do with the ability to create certain vibrations and energy fields, and this app has definitely this power thanks to Dr Marks superbe voice in combination with the background soothing sounds and atmosphere.
I strongly recommend Harmony to everybody interested in meditation and always look forward for new contents!
