When developing a grocery app, essential features include user registration and profiles for personalized experiences. A robust product catalog with detailed descriptions and images is crucial. Implement a smart search function and filtering options for easy navigation. Include a shopping cart and secure payment gateway for seamless transactions. Real-time order tracking enhances user satisfaction. Push notifications can keep users updated on promotions and order status. Additionally, consider integrating a loyalty program to encourage repeat purchases. Lastly, ensure an intuitive design for both users and admin. For more insights on grocery app development, visit Dev Techonsys.