PlanO, also known as Plan O, is a free iPhone app developed by BalEum Lee, falling under the Business & Productivity category. With the slogan "Your plans are O from today!" PlanO aims to help users organize their daily schedules effectively. The app offers a circular planning table where users can easily overview their daily tasks.

One of the key features of PlanO is its ability to display daily schedules in a concise circular format, making it convenient for users to check their plans at a glance. Users can set and manage recurring tasks based on weekdays, periods, or specific times. Additionally, the app provides six pastel tone themes to customize the appearance of the daily planner, making it visually appealing and personalized.