Yes, 睡眠-失眠人士好帮手,白噪音&冥想&助眠 is free to download, however it contains in-app purchases or subscription offerings.
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睡眠-失眠人士好帮手,白噪音&冥想&助眠 has several in-app purchases/subscriptions, the average in-app price is USD 1.99.
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