找砂石 (pronounced "Zhǎo Shāshí") is a free iPhone app developed by Sandstone Shanghai Data Technology Co. Ltd. It falls under the category of Business & Productivity and aims to simplify the entire supply chain process of sand and gravel construction materials. With its mission of "making trading easier," 找砂石 strives to establish an industry service system for "Internet + sand and gravel construction materials," fostering a value-sharing and industry-winning ecosystem.

The main focus of the app is to provide trading services to its users. It offers features such as a trading hall for listing and browsing products, online inquiries for pricing, a resource map for locating suppliers, online contract signing, one-click account reconciliation, real-time settlements, supply chain financing, and intelligent delivery. These functionalities aim to provide users with a simple and efficient trading experience, from initiating a transaction to completing the settlement. Upholding principles of safety, efficiency, and simplicity, 找砂石 aims to solve the challenges faced by users in the trading process, enabling truly simplified transactions.