お買い物電卓 is a popular calculation app that allows users to easily compare the prices of two products and calculate the discounted price of items labeled with a discount percentage. It offers three calculation modes: price comparison, discount calculation, and price per 100g calculation. The app also includes a shopping list feature, allowing users to create and manage their shopping lists conveniently. With its intuitive swipe gestures and user-friendly design, users can switch between calculation modes effortlessly, even when holding a shopping basket in one hand. The app supports the calculation of prices with both 8% and 10% consumption tax rates, eliminating the need for manual tax rate switching. Best of all, it is completely free to use, providing users with a smart and cost-effective shopping experience.