Side Space is a browser extension designed to help users organize and manage multiple tabs through a vertical tab manager. It allows users to sort tabs into vertical spaces within the sidebar, making it easier to find, manage, and focus on specific tabs. According to product background information, Side Space supports features such as AI-driven tab grouping, auto-saving, and cross-device syncing, with main benefits including improved browsing efficiency, reduced tab clutter, and personalized customization. Side Space's pricing strategy is simple and transparent, offering a one-time payment option for lifetime use.