Side Space

Side Space is a browser extension for heavy browser users, students, researchers, developers, and creators who want vertical tabs plus an AI copilot to reduce tab overload.

Key capabilities include:

• Vertical tab sidebar with fuzzy search, pinning, multi-select, and drag-and-drop tab and group management.
• Spaces for separating contexts (work, study, shopping, hobbies), with space theming, renaming, ordering, and a space switcher.
• Side Copilot AI for AI tab grouping (based on titles, URLs, and page content) plus chat and automation features such as summarizing pages, selecting context from open tabs, researching topics, searching history, restoring closed windows, and managing tab groups and windows.
• Performance and reliability tools, including tab suspension to reduce memory usage, de-duplicate tabs, save/restore tab groups, copy all URLs (markdown/text/json), and session backup (JSON).

Pricing: Freemium. Free ($0) includes up to 5 spaces, up to 1,000 URLs for AI grouping, and Side Copilot Chat Mode. Pro ($4.9/month) adds unlimited spaces and AI grouping, Agent Mode, shortcuts, and cloud-synced chat history. Pro+ ($8.9/month) adds multi-tab chat and advanced tools such as mind maps, YouTube chatting, and file chat.

Notable for delivering an Arc-like sidebar experience inside existing browsers (Chrome, Edge, Brave, Firefox, and other Chromium-based browsers), with cloud sync across devices and an AI agent that can organize tabs and automate browsing workflows without switching to a new browser.