# 639hz Solfeggio Sonic Meditation by Glenn Harrold & Ali Calderwood — user reviews > 24 indexed App Store user reviews of 639hz Solfeggio Sonic Meditation by Glenn Harrold & Ali Calderwood by Glenn Harrold Publishing Ltd, rated 4.70/5 from 15 ratings. - Source: https://appshunter.io/ios/app/639hz-solfeggio-sonic-meditation-by-glenn-harrold-and-ali-calderwood/id512394586/reviews - App overview in markdown: https://appshunter.io/ios/app/639hz-solfeggio-sonic-meditation-by-glenn-harrold-and-ali-calderwood/id512394586.md - Rating breakdown: 5★ 14 · 4★ 0 · 3★ 0 · 2★ 0 · 1★ 1 ## Newest reviews (11 of 24) ### 5/5 — Amazing *2013-07-05, version 1.0* My children and I fall asleep most nights to these wonderful meditations! I wake up in the exact position that I fell asleep in! Feel wonderful every morning! ### 5/5 — LOVE *2013-03-27* Love this app!!! Glen is amazing. I listen to the "awake" version thru headphones while working or even on a walk and instantly feel better. Glen, thank you for the amazing work you do-you are a gem!!! ### 5/5 — Great app *2013-01-05* Very relaxing ### 5/5 — Wow *2012-12-09* Been trying several of Glenn's Solfeggio apps. This is the first to really bring about an out-of-body experience. He always brings you back with grounding, trust him and you will find out how powerful you really are. Blessings and love to Glenn and Ali. ### 5/5 — Deeply Profound *2012-11-01* This series of apps is the best in the business. Truly life changing if applied as instructed! But you MUST get all six! ### 5/5 — Simply amazing *2012-10-07* The tracks are deeply powerful and resonant but don't overwhelm the listener with sound. Perfectly balanced and effective. Thank you! ### 5/5 — Thank you! *2012-09-19* This is the second Solfeggio app I have downloaded. I love them. I am having a surgery in a couple of weeks that will determine my life span. I am planting the seeds for the best outcome with this app. Thank you, I'll let you know. Love and healing peace to all! Dee ### 5/5 — excellent *2012-07-27* Keep the volume low and I would NOT let children sleep to these. There are ones designed specifically for children. For me emotions are surfacing. I even pulled the headphones out in my sleep and felt anger. Obviously this is something I need to deal with on this deep level and how awesome we don't have to pay a shrink :) I have all the other ones and they are phenomenal for creativity and life changing, but I would put my children to sleep to Lori Lite or Mermaid Tales instead. ### 5/5 — Love this app! *2012-04-27* Wonderfully relaxing! Cant wait for the mext one to be released!! ### 5/5 — These apps are the best! *2012-03-30* I love these apps! I have been stalking the app store for the last few weeks since I heard a new one was coming out. They are so relaxing, and the 528 app is also very healing. I have a two year old daughter, and we always listen during her nap time, and she gets so relaxed she goes right to sleep. I recommend the audiobooks, as well bc you can put them on a playlist and listen all night. Can you tell I think Glenn Harrold apps are amazing?! ### 5/5 — 639 *2012-03-29, version 1.0* This meditation is simply amazing! It is a powerful way to bring peace, healing and love into your life. All of the apps by Glenn are incredibly useful and transformative but the solfeggio meditations are especially soothing! Diana ## Most critical reviews (10 lowest-rated) ### 1/5 — Disappointing *2024-10-14* Hoping to hear the simple frequency without all of the noise. This has noise that interferes with the frequency. Water and singing. I can deal with the water. But the singing does not sound good at all. It grates on my nerves causing stress and frustration. Waste of money, this app is. **Developer response:** Sorry the app wasn't for you. If we can help with anything please feel free to contact us directly at sales@hypnosisaudio.com. Best regards Diviniti ### 3/5 — Speeches *2020-01-05, version 1.2* On my side sleeping audio should not contain speeches ### 4/5 — Please add auto-repeat feature *2012-06-08* I have all of Glenn's solfeggio apps and love to fall asleep with them. The only thing the app needs is an auto-repeat feature, so I can keep it playing in the background. ### 5/5 — This one is great! *2019-12-08* I highly recommend anything by Glenn Harrold. I have been regularly listening to his hypnosis/meditations for several years now. This is one of my favorites and truly helps me re-center and fall asleep at night. Thank you!! ### 5/5 — This app is must to get! *2019-03-12* I'm in my sixties and have tried a lot of relaxation apps. Glenn has the most relaxing voice ever. This one has great vibrations that take me to another world. I have all the Solfeggio Scale apps of Glenn's. Great job Glenn! ### 5/5 — Thank you! *2016-11-12* Great app, it brings out feelings that I haven't felt in a long time. I love that I can fall asleep every time and feel lighter each time. So thank you; thank you for guiding me into this unsuspecting inner me. Looking forward to some of your other apps:) ### 5/5 — So grateful *2016-07-03* Glenn Harrold has really made a difference with all of his hypnosis apps I've used. I rarely sleep without playing one. I am sensitive to tone and sound, and his skillful mix of hypnosis and hertz therapy really helps me calm down at night. ### 5/5 — Debra *2015-04-11, version 1.2* This app is wonderful , so easy to use and enjoyable to listen to, I found I connected to people a lot easier in a very short space of time ### 5/5 — Fantastic!! *2014-08-18* These meditations are so amazing. U owe it to yourself to get them and evolve to places u didn't even know existed ### 5/5 — Amazing *2014-05-06, version 1.0* I have downloaded a few of Glenn's apps and this is by far my favourite. As quite an anxious person, I find I wake up feeling centered and at ease after listening to this app before sleeping. I've noticed the difference in how I feel when interacting with others as well. A great investment. ## Most praised reviews (3 highest-rated) ### 5/5 — Fantastic *2014-01-21* Worth every penny!!! ### 5/5 — Powerful and amazing *2013-10-09, version 1.0* Glenn always brings me back to myself and a secure comfortable space to totally let go, this app though has more than just the 3 audios for awake sleep and background music only, which you can listen to I presume if you want to carry on doing the work in the company of others without disclosing what it's about, the good thing is they'd probably benefit too, but also this app teaches self-hypnosis and has a great chart that explains different Solfeggio scales effect on the system. Thanks Glenn and Ali Calderwood for the scales. ### 5/5 — Life changing *2013-07-29* I've tried lots of guided hypnosis sessions and meditations. This series is the best, by far. I actually feel physical shifts and changes in my body while listening. Glenn's words are powerful and fitting. He states everything in positive terms, which is very important in these types of recordings. The music is magical. I highly recommend this entire series! --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*