JUKUSUI is a lifestyle app developed by 株式会社C2C2 Inc. that provides a multi-functional alarm clock to support and enhance your sleep. The app features lull sounds, a smart alarm, and sleep reports. The lull sounds help induce peaceful sleep, while the smart alarm detects your light sleep and wakes you up, making it ideal for people who have trouble waking up in the morning due to hypotension or those who turn off the alarm only to fall back to sleep. The sleep report provides daily logs to help you track your sleep quality, sleep efficiency, hours of sleep, and snoring hours and volume. Additionally, the app offers cloud service to keep all of your sleep logs on the dedicated server safely. The app is free to use, but the subscription service "JUKUSUI Premium" offers all premium features for free and hides all in-app ads.