SideBrain - Second Brain & Pro-Bookmarker

Your smart bookmark manager & second brain in Chrome's sidebar. Save pages with tags, notes, and instant highlight captures.

SideBrain transforms Chrome's sidebar into an integrated developer research library and text snippet capturing tool. Designed for deep focus and maximum speed, SideBrain combines high-contrast modern aesthetics with powerful local knowledge organization. KEY FEATURES: - High-Speed Text Capture: Highlight text on any webpage and hit Alt+S (or right-click) to instantly save quotes directly into your sidebar library without breaking your browsing workflow. - Native Chrome Deep Links: Every captured quote generates an automatic direct link. Clicking a saved item re-opens the target webpage and highlights the exact text passage instantly. - Live Search & Tag Filtering: Organize research by custom hashtags. Quickly filter across hundreds of references or search through titles, notes, snippets, and tags in real time. - LLM & Notion Markdown Export: Export your entire saved research library or filtered sets with one click into crisp, well-formatted Markdown—ready to paste into ChatGPT prompts, Claude research briefs, or Notion docs. - Smart Webpage Summaries: Automatically analyze webpage headings and metadata for concise page overviews. - Zero-Cloud Local Privacy: Everything happens locally in your browser. All bookmarks, notes, and snippets are saved exclusively to Chrome's encrypted local storage. Zero tracking, zero ads, and zero server logins required. HOW TO USE: 1. Open the SideBrain panel by clicking the extension icon in your Chrome toolbar. 2. While browsing any website, highlight an interesting sentence or code snippet and press Alt + S (or right-click and choose "Save snippet to SideBrain"). 3. Add tags (comma-separated) or personal notes in the Quick Save Card and click "Save to Second Brain". 4. Use the "LLM / Markdown Export" button at any time to copy all your saved knowledge into clipboard-ready Markdown format!