Second Brain Note Linker Overlay

WHAT IT DOES

Second Brain Note Linker Overlay continuously scans your note-taking pages to identify relationships between your notes. It extracts titles and content, calculates similarity scores using keyword frequency analysis, and displays a floating panel of related notes ranked by relevance. With one click, you can copy suggested links as Markdown or plain text, making it effortless to build a connected knowledge graph across your notes.

WHERE IT RUNS

Works on Obsidian, Notion, Roam Research, and any site with text content. The script intelligently detects note structures across platforms, extracting content from common selectors like .markdown-preview-view, .notion-page-content, and .roam-article, ensuring compatibility with major note-taking applications and general web pages.

HOW TO USE

The overlay appears as a draggable panel in the corner of your screen. Each time you view a note, the script automatically scans the page, identifies the title and content, and builds a local index of all notes you've visited. The panel displays a list of related notes with percentage-based relevance scores and shows which keywords overlap. Select any number of suggestions, then click "Insert Selected as Markdown" or "Insert as Plain Text" to copy the links to your clipboard for pasting into your note.

MECHANISM — REAL-TIME SIMILARITY SCORING

The script extracts keywords from your current note using frequency analysis (TF weighting), filtering out common words and punctuation. It compares these keywords against every note in your local index using Jaccard similarity, then computes a weighted relevance score combining content similarity and keyword overlap. This runs entirely client-side with no external API calls, preserving privacy while delivering instant results. Each note snapshot stores the URL, title, content, and timestamp, allowing the system to rebuild your knowledge graph across sessions.

THE PANEL

The floating panel is fully draggable and remembers its position per domain. Click the minimize button to collapse it to a small bubble, or press Escape to hide it. The panel automatically adjusts to different screen sizes and can be resized to show more candidates. All settings and indexed notes are stored locally using GM_setValue, so your knowledge graph stays intact across browser restarts.

PLEASE NOTE

This script requires the free BotGentz extension to run. It does not send any data to external servers; all indexing and storage remain entirely local to your browser. As websites change their structure, the content extraction selectors may need updating. If the overlay stops detecting your notes, rescan or check for script updates. The script never reads or writes password fields, hidden inputs, or file inputs. It stores note content and URLs only, and you can clear the local index at any time using the "Clear Local Index" button in the settings section.