Ocean Waves 528Hz Sleep is not free (it costs 12.99), however it doesn't contain in-app purchases or subscriptions.
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The price of Ocean Waves 528Hz Sleep is 12.99.
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The sounds and the frequency are really good, but the phone needs to be open, and the app needs to be open for it to operate. don’t try to sleep with this thing on your charger because the app uses so much energy your phone will actually drain overnight… this app needs to be updated to operate when the phone is in sleep mode.
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