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AI Second Brain — now in early access

Your AI Second Brain

Cortex ingests YouTube videos, articles, PDFs, and emails — then surfaces deep insights, entity relationships, and a knowledge graph you can actually converse with.

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No credit card required · Free tier available

Everything your knowledge deserves

From raw ingestion to conversational retrieval — six pillars that make Cortex the deepest knowledge layer you can own.

  • Ingest Anything

    YouTube videos, PDFs, web articles, emails, and audio. One URL or upload — Cortex handles the rest.

  • AI Analysis

    Automatic summaries, key insights, and topic tagging powered by Claude. Every item gets a one-liner and deep-dive.

  • Knowledge Graph

    Entities and relationships extracted from your content and laid out in a 3D force-directed graph you can explore.

  • Agentic Workflows

    CodeAct orchestrator that can search your knowledge base, generate reports, and run multi-step reasoning tasks autonomously.

  • Memory Continuity

    4-layer WGM memory: working context, episodic recall, semantic facts, and nightly consolidation — across every session.

  • BYOK

    Bring your own Anthropic, Gemini, or OpenAI keys. $0 platform cost — pay your provider directly at your negotiated rate.

How it works

Three steps from raw information to actionable knowledge.

  1. Capture

    Paste a URL or upload a file. Cortex fetches, transcribes, and chunks your content automatically — YouTube, PDFs, web articles, emails.

  2. Connect

    Embeddings, entity extraction, and knowledge-graph edges are built in the background. Your ideas are linked — not just stored.

  3. Converse

    Ask anything. The agentic orchestrator searches your graph, recalls relevant memory, and answers with citations from your own knowledge base.

Hybrid

Pay-as-you-goBased on usage

Cortex manages API keys, infra, and model routing. You pay only for what you use — no monthly commitment.

  • All ingestion sources (YouTube, PDF, web, email)
  • AI analysis + entity extraction
  • Knowledge graph
  • Agentic workflows (CodeAct)
  • 4-layer WGM memory
  • Managed API keys — no setup needed
  • Usage-based billing (no monthly floor)
Start for free
Power users

BYOK

$0platform cost

Bring your own Anthropic, Gemini, or OpenAI API keys. You pay your provider directly — Cortex charges nothing.

  • Everything in Hybrid
  • Zero platform fee — pay your provider directly
  • Multi-key rotation (Anthropic → Gemini → LiteLLM)
  • Fernet-encrypted key storage
  • Full BYOK via Settings UI
  • 100+ model access via LiteLLM (opt-in)
  • Cost dashboard per provider
Connect your keys

About Cortex

Built by Manik Rai

845+ tests · Open principles · No VC pressure · Shipping fast

Cortex is an opinionated, well-tested knowledge platform. Real engineering discipline — not a demo.

Start building your second brain today

Free to start. No card required. Your knowledge, fully owned.

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