Sonjas Bella Italia is a free Android app developed by Sonja Bakker, a renowned author in the field of weight loss and nutrition. The app is a companion to her latest book, which is also titled Sonjas Bella Italia. The app is available only to those who have a unique code from the book.

The app provides users with a weekly menu, recipes, and tips from the book, which is focused on enjoying Italian cuisine while losing weight. Users can keep track of their BMI and weight through the app, making it easy to monitor their progress. The app also includes a shopping list feature, making it easy to plan out meals for the week.