Think faster.
Remember everything.
Cortex is the AI-native second brain that captures every idea, links it to everything you know, and hands it back the moment you need it.
2.4M+
notes linked every day
41%
faster recall vs. plain search
120ms
median sync latency
100%
private, end-to-end encrypted
Built for how thought actually moves.
AI that reads between your lines
Cortex understands context across every note you've written, surfacing connections you didn't know to look for.
A living knowledge graph
Every note is a node. Watch your second brain grow in real time as ideas connect themselves.
Instant everywhere
Sub-200ms capture and sync across every device, powered by a local-first engine built for speed.
Encrypted at the core
Zero-knowledge encryption means your thoughts stay yours — even we can't read them.
Think out loud, anywhere.
Voice, text, or a quick clip from the web — Cortex's quantum capture bar is one shortcut away on every device, parsing raw thought into structured notes instantly.
- Global capture shortcut
- Voice-to-note transcription
- Smart inbox triage
Capture module
Your ideas, automatically wired.
Cortex's graph engine detects entities, themes, and prior notes as you type, drawing the links so you never have to manage a folder tree again.
- Real-time backlinking
- Entity & theme detection
- Auto-generated graph view
Connect module
Ask your second brain anything.
Query in plain language — 'what did I think about the Q2 pricing change?' — and Cortex retrieves the exact thread of notes, not just keyword matches.
- Natural-language search
- Semantic recall
- Context-aware summaries
Recall module
Power users run on Cortex
“It's the closest thing I've found to an actual extension of memory. The graph view alone changed how I research.”
Priya N.
AI Researcher
“I asked it a question about a meeting from eight months ago and it just... knew. Genuinely unsettling at first, now indispensable.”
Marcus L.
Startup Founder
“Migrated my entire second brain over in an afternoon. The linking quality after import was better than my manual setup ever was.”
Sofia A.
Systems Engineer
Scale your second brain
Start free. Upgrade for unlimited recall and sync.
Starter
Everything to begin building your graph.
$0/mo
- Unlimited notes
- Auto-linking
- 2 synced devices
Neural
Full AI recall and unlimited sync.
$12/mo
- Everything in Starter
- Semantic search & recall
- Unlimited devices
- Priority compute
Collective
Shared graphs for fast-moving teams.
$22/mo
- Everything in Neural
- Shared knowledge graphs
- Admin & SSO
- Dedicated support