Side Copilot adds vertical tabs, Spaces and an AI agent to your browser side panel. Free plan available; paid plans from about $2.9/month.
Researched and fact-checked by Bartu Cavusoglu · Updated October 26, 2026
Side Copilot is a browser extension from CursorDance, LLC that fills the browser's side panel with a vertical tab manager and an AI assistant. The company's tagline is "Browse less. Get more done," and it describes the product as an AI agent in the side panel for researching, organizing and automating the web.
It targets people who accumulate many open tabs. Instead of asking users to switch to a dedicated AI browser, Side Copilot works inside browsers they already use. The site lists Chrome, Edge, Brave, Dia, Comet, Vivaldi, Sigma, Firefox and Zen, and says it has 16,000+ users.
After installation, Side Copilot appears in the side panel as a vertical list of tabs. Tabs are sorted into Spaces, which are topic-based collections such as workspace, social media, shopping, personal or study. Users view one Space at a time within a single browser window, and Spaces are saved automatically.
The AI layer has two modes. Chat Mode reads the context of open tabs so users can summarize, select context and extract content. Agent Mode takes actions in the browser, including grouping tabs, managing windows, searching browser history, restoring closed windows and researching topics. Signing in enables Cloud Sync across devices.
Tab management is the foundation. Users can pin key tabs in each Space, search tabs and Spaces with fuzzy search, suspend tabs to free memory, remove duplicates and select several tabs for bulk actions. Tabs can be grouped by domain in one click, by AI using custom categories, or automatically through Group Guard, and groups can be saved and restored.
Other utilities include copying all URLs in a Space as markdown, text or JSON, moving tab groups to new windows, and customizing Space themes. The interface offers dark mode and five languages. On higher tiers, shortcut templates, BYOK model access and tools for chatting with files, YouTube videos and Reddit searches extend the assistant.
Side Copilot is a browser extension from CursorDance, LLC that adds a vertical tab manager and an AI agent to the browser's side panel. It organizes tabs into Spaces, chats with open tabs and can automate browser tasks.
There is a Free plan at $0, Pro and Pro+. The pricing cards show $2.9/month for Pro and $7.9/month for Pro+, while the comparison table lists $4.9 and $8.9 per month, so confirm the current price at checkout. Yearly billing is advertised as 2 months free.
Yes. The Free plan includes up to 5 Spaces with Cloud Sync, unlimited AI chat with the current page, Group Guard with patterns and 2 free Agent Mode trials per day.
The site lists Chrome, Edge, Brave, Dia, Comet, Vivaldi, Sigma, Firefox and Zen. Spaces can be synced across these browsers by logging into an account.
Chat Mode answers questions about open tabs, summarizes pages and extracts content. Agent Mode takes actions in the browser, such as grouping tabs, managing windows, searching history and researching topics.
Yes. Each new purchase is covered by a 100% money-back guarantee within 7 days of the purchase date.
Yes, on paid plans. Pro includes BYOK (Bring Your Own Key) access to AI models from providers, and the comparison table lists Agent Mode on Pro as available with BYOK.
It suits people who work with many tabs and want vertical tabs, Spaces and AI help in their existing browser. Researchers, creators and professionals are the audiences the site names.