AptiStockX is a local-first desktop application for stock charting and portfolio research, compatible with Windows, macOS, and Linux systems. As a modern evolution of the original AptiStock launched in 2005, it caters to self-directed traders and researchers seeking autonomy over their chart files, market data, watchlists, and workspaces. This application features seamless integration with local CSV data, customizable market data providers, a variety of technical and custom indicators, drawing studies, watchlists, reusable workspaces, and support for multiple chart windows across various monitors. The latest version, 3.1, introduces several enhancements, including a global stock symbol catalog that is searchable, a dockable Global Market Stock Viewer, and advanced market and instrument filters that greatly improve usability. Additionally, users can perform offline symbol searches and enjoy streamlined charting and downloading workflows for supported global markets. With enhanced line-study tools and improved catalog updating alongside quicker chart rendering, AptiStockX continues to evolve as a powerful tool for traders.