Yes, 秒睡-正念提升睡眠 自然白噪音 冥想 助眠 is free to download, however it contains in-app purchases or subscription offerings.
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秒睡-正念提升睡眠 自然白噪音 冥想 助眠 has several in-app purchases/subscriptions, the average in-app price is $4.99.
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