Bidirectional links
Every note knows its neighbors. Type [[ and watch your past thinking assemble itself around the present moment.
Your second brain,
finally awake.
Cortex captures every fleeting thought, connects it to everything you already know, and quietly resurfaces it at the exact moment you need it.
Free for your first 1,000 notes · No credit card
Core idea
Memory is a network, not a folder
#memory#learning
Sleep & memory
#neuroscience
Hippocampal replay
#paper
Deep work ritual
#habit
Spaced repetition
#method
Zettelkasten
#system
Spaced recall
Cortex schedules gentle resurfacing of old notes, so knowledge compounds instead of decaying.
Local-first sync
Your graph lives on every device in milliseconds, end-to-end encrypted, even offline.
The method
Capture loosely. Connect deliberately. Remember forever.
01
Capture
One keystroke from any app. Inbox it now, organize never.
02
Connect
Cortex suggests links between notes as your graph grows.
03
Recall
A daily digest brings old thinking back exactly when relevant.
“I stopped losing ideas the week I started using Cortex. It feels less like software and more like a prosthetic memory.”
Never lose a good idea again
Join 128,000 thinkers whose best thoughts refuse to stay forgotten.