Write, connect, and remember everything
Codex turns scattered notes into a connected knowledge base. Capture ideas fast, link them naturally, and let AI surface what matters.
Trusted by teams and thinkers at
Block-based editor
Write with slash commands, drag-and-drop blocks, and full markdown support. Every note is structured, never messy.
- Slash commands
- Full markdown
- Drag & drop blocks
- Nested structure
Backlinks & graph view
See how your ideas connect. Codex automatically links related notes and visualizes your whole knowledge base as a graph.
Nested pages
Organize notes in unlimited nested hierarchies. Structure your workspace exactly the way your brain works.
Search everything, instantly
A command palette that finds notes, blocks, and even content inside attachments in milliseconds.
Ask your notes
Query your entire knowledge base in natural language and get answers grounded in your own writing.
The team aligned on shipping the graph view before the editor rework, with design specs due Friday and a retro scheduled for next Monday.
Auto-summaries
Long meeting notes or research docs get summarized automatically, with key points extracted for you.
Everywhere you work
Web, desktop, and mobile apps stay in sync in real time. Full offline support means your notes are always available.
Start from a template, not a blank page
Ready-made structures for work, study, writing, and projects — duplicate one and make it yours.
One tool, built for how you think
Whether you're organizing your own thoughts or your whole team's knowledge, Codex adapts to the way you work.
Build your second brain
Capture every idea, article, and thought in one place — and let Codex connect the dots for you.
- Daily notes with automatic backlinks
- AI-powered recall of past ideas
- Distraction-free writing mode
Loved by thinkers and teams alike
Codex replaced four different apps for me. My notes finally feel connected instead of scattered across folders.
Mara Lindqvist
Product Designer, Fieldnote
The AI search alone is worth it. I can ask a question and get an answer pulled straight from my own research.
Devon Okafor
PhD Researcher
Our team wiki used to be a graveyard of outdated docs. Codex made it something people actually update.
Priya Shah
Engineering Lead, Northwind
Simple pricing, no surprises
Start for free. Upgrade when you need AI, unlimited storage, or a shared workspace for your team.
Free
For individuals getting started with note-taking.
- Unlimited notes
- Basic backlinks & graph view
- 1 GB file storage
- Web & desktop apps
Pro
For power users who want AI and unlimited sync.
- Everything in Free
- AI-powered search & summaries
- Unlimited file storage
- Full version history
- Priority support
Team
For teams that need shared workspaces and admin controls.
- Everything in Pro
- Shared team workspaces
- Granular permissions
- Admin dashboard & audit log
- SSO & SCIM provisioning
Questions, answered
Start building your second brain today
Free forever for personal use. No credit card required.