This document provides an overview of the key features needed to develop an on-demand grocery delivery app similar to Instacart. It discusses features for the customer app, shopper/delivery app, and admin app. The customer app would allow users to order groceries from partnered stores, view product details and schedule deliveries. The shopper app would manage orders, provide navigation and process payments. The admin app would oversee shoppers, customers, manage notifications and analyze revenue data. Developing these features in collaboration with an experienced mobile app company is recommended to build a successful on-demand grocery app.