Simple Weight Management Diary is an iPhone application developed by Masaya Kato. This free app falls under the Education & Reference category, specifically in the Medicine subcategory.

The main purpose of this app is to provide a simple and easy-to-use diary for managing weight. Users can write short comments and use it as a tool for reflection.

The app offers several key features, including a diary function where users can jot down their thoughts and progress. It also has a weight input function, allowing users to track their weight over time. Additionally, there are three stamp options available - "Overeating," "Excessive Drinking," and "Exercise" - which can be used to indicate specific behaviors.

To visualize progress, the app provides graph displays for different time periods ranging from 1 month to 3 years. Users can also set their target weight within the app.

Please note that this app is primarily developed for use in Japan, so there may be limitations in data aggregation when it comes to daylight saving time or time differences.