BUDNI is a free iPhone app developed by BUDNI Handels- und Service GmbH & Co. KG that helps you shop sustainably while saving money. The app offers a wide range of features, including coupons with great discounts and benefits, current offers from their weekly ads, and information about the availability of products in your nearest store. Additionally, the app informs you which products are vegetarian, vegan, gluten-free, or lactose-free.

The app also has a digital shopping list feature that you can easily share with family and friends. It also has a store locator with opening hours, navigation, and contact information. With BUDNI's digital customer card, you can collect points and redeem them to get discounts and benefits. Moreover, the app has a sustainability score feature that lets you know how responsible your shopping habits are and where you can improve. If you're a parent or about to become one, the app has a "Mein Baby-Club" feature that offers double bonus points on baby and children's products, birthday gifts, and a welcome gift of 5,000 bonus points.

Overall, BUDNI is a must-have app for anyone who wants to shop sustainably while saving money.