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AI research vault for local Markdown: capture sources, audit AI work, save research packs, and export context. Cortex turns every page you save into clean markdown on your disk — categorized, cross-linked, and graphed by AI. Built for people who want a real second brain, not another bookmarking app. — What you get — • ONE-CLICK CAPTURE Save any page or selection with ⌘⇧S / ⌘⇧E, the toolbar icon, or a right-click. Mozilla Readability strips the chrome and Turndown produces clean markdown with frontmatter (title, source URL, capture time, tags). • A REAL FOLDER ON DISK You pick the vault folder. Every capture lands as a plain .md file. Open it in Obsidian, VS Code, anything. There is no proprietary database — uninstall the extension and your notes are still there. • AI ORGANIZE New captures land in inbox/ and Cortex AI tags them, categorizes them, and cross-links them to existing entities and concepts in your vault. Auto or Manual mode — you stay in control. • IN-EXTENSION WIKI + KNOWLEDGE GRAPH Browse and edit your vault from the side panel. Click [[wikilinks]] to navigate. A Cytoscape-rendered force-directed graph shows how every note connects. • ASK YOUR VAULT Type a question. Cortex retrieves the most relevant notes (semantic + lexical), feeds them to the model, and answers with [[wikilink]] citations back to the source notes. • AUTO-RESEARCH Type a topic and Cortex dispatches a web research agent (Perplexity Sonar), gathers and dedupes citations, extracts entities, and writes a fully-linked note with inline cites. • INGEST FROM YOUR EXISTING SOURCES PDFs, DOCX, Markdown/HTML files, Google Drive documents, Gmail threads, and YouTube transcripts can all be turned into source notes in your vault. — Pricing — • Free — 25 AI credits / month. Quick capture and Ask are included. • Plus — $9/month or $90/year. 1,000 AI credits, document/Drive/Gmail ingest, web research, AI link validation. • Pro — $19/month or $190/year. 5,000 AI credits, deep multi-step research, graph investigate, smart-merge audit. You only ever pay for AI usage. The vault, capture, search, and graph are free forever. — Privacy posture — • Vault content stays on YOUR disk. Cortex does not host or sync your notes. • Page content is sent to Cortex AI only when you trigger an AI action that needs it. • The backend stores usage metadata (feature, model, credits, tokens) for billing, NOT your captured content. • No third-party trackers, no analytics, no telemetry. • Cortex uses activeTab + scripting (not <all_urls>) so it cannot see a page until you click capture. Manage your account at https://cortexmd.ai/account