조은하루 is a lifestyle app that offers a unique way to send heartfelt letters. It allows users to create and send personalized letters, preserving special moments with care and sincerity. With real-time delivery, users can express their emotions instantly, saving waiting time. The app provides various sharing options, allowing users to share their music letters not only through messengers but also across different social media platforms.

The app features a custom letter paper function, enabling users to tailor their letter paper to their preferences by choosing textures, colors, patterns, and corner styles. Users can also embellish their letter papers with images, utilizing a range of basic images and brightness adjustments to create their own unique stationery.