Health Diary is a free Android app developed by PNN Soft that helps users to track and record their vital health parameters efficiently. The app aims to prevent or keep under control chronic diseases such as heart and vascular disease, diabetes, and overweight, among others. The app allows users to track parameters like body weight, blood pressure, blood sugar, cholesterol, and any custom added parameters.

One of the most significant features of Health Diary is that users can add, modify, or delete single records of their health parameters. The app also provides options to list the historical records and draw observations charts. Additionally, users can export or import their data in CSV format and store it in the "healthdiary" folder located in external storage. Health Diary supports both metric and imperial units and allows users to create a custom set of observations.

Health Diary is available in English and Russian languages. Users can contribute to the app's translation into other languages by contacting Their contribution will be listed in the application, making it a community-driven app.