A second brain,
for you, forever.

Crown is a private, local-first knowledge base with linked thinking. Backed by AXE Brain. No lock-in. Your notes, your vault, your rules.

Download Crown Open in Browser
v1.0 · macOS · Windows · Linux · Web
Vault
Architecture Notes
Fleet Operations
API Reference
Meeting Notes
Research — LLMs
Training Pipeline
Deploy Runbooks
Signal Protocols

Architecture Notes

[[Fleet Operations]] · [[API Reference]]
Backlinks
Fleet Operations
Deploy Runbooks
Signal Protocols
Graph
Core
Everything you need to think clearly.
Links between notes surface connections. The graph reveals structure. Brain sync keeps everything backed up and searchable.

Linked Thinking

[[Wiki-links]] connect ideas. Backlinks surface automatically. Every note becomes part of a living network.

Knowledge Graph

Interactive force-directed graph shows how your notes connect. Zoom, filter, explore the topology of your thinking.

Local First, Always

Your vault lives on your machine. Plain files. No cloud dependency. Sync to Brain when you choose to.

AXE Brain Sync

One-click sync to your Brain vault. Full-text search, semantic embeddings, and fleet-wide knowledge at your fingertips.

Cross-Platform

Native Electron apps for Mac, Windows, and Linux. Web version at brain.axe.onl. Mobile via Capacitor.

Extensible

Mermaid diagrams, syntax highlighting, collapsible sections, table of contents. Built-in, no plugins to install.

Built-in
No plugin hunting. It just works.
Every feature ships ready. No community marketplace, no compatibility matrix, no breakage on updates.
Mermaid Diagrams
Flowcharts, sequences, ERDs inline
Syntax Highlighting
Prism.js with 8 language packs
Auto Table of Contents
Sticky TOC from headings
Collapsible Sections
Fold long content blocks
Local Graph
Per-note relationship map
Knowledge Graph
Full vault force-directed graph
Backlinks
Auto-detected incoming links
Full-Text Search
Instant search via Brain index
Dark Mode
Native OS theme detection
Compose Publishing
One-click publish to compose.casa

Get Crown

Free. Open source. Your data stays yours.

macOS
Apple Silicon + Intel
Windows
x64 installer
Linux
AppImage / .deb
Web
brain.axe.onl

Desktop builds coming soon · Web version live now