Connect Your Ideas. Build Your Knowledge Network.
A beautifully simple note-taking app that helps you link ideas, visualize connections, and build a personal knowledge base that grows with you.
Independently Built
100% user-supported, no investors or venture capital
End-to-End Encrypted
Your data is encrypted on your device before syncing
Built in Netherlands
Hosted in the EU with GDPR compliance
Fair Pricing
From €3/month, transparent and sustainable
Everything You Need to Capture and Connect Ideas
Simple, intuitive tools designed to help you organize your thoughts and build your knowledge network effortlessly.
Graph View
Visualize the connections between your notes and explore your knowledge network.
Linked Notes
Effortlessly link ideas with bi-directional links, creating a rich web of information.
End-to-End Encryption
Your notes are encrypted on your device before syncing. Only you have the keys to decrypt your data.
Lightning Fast
Experience instant navigation and seamless note-taking with our optimized, distraction-free interface.
Local-First Design
Your data is always yours. Work offline and sync seamlessly when connected.
Cross-Device Sync
Access your notes securely from any device, keeping your knowledge always at hand.
Build Your Knowledge Network in 3 Simple Steps
Get started in minutes and see how easy it is to organize and connect your thoughts.
Capture Ideas
Start writing notes, thoughts, and insights in a clean, distraction-free environment.
Connect Knowledge
Link related notes effortlessly with bi-directional links to build a rich knowledge graph.
Explore & Discover
Use graph view to visualize connections and uncover hidden relationships between your ideas.
Install Cranium on Any Device
Cranium is a Progressive Web App (PWA) that works like a native app. Install it on your device for quick access and offline functionality.
iOS (iPhone/iPad)
- 1Open Cranium in Safari browser
- 2Tap the Share button at the bottom of the screen
- 3Scroll down and tap 'Add to Home Screen'
- 4Tap 'Add' in the top right corner
- 5Cranium will now appear on your home screen like a native app
Android
- 1Open Cranium in Chrome browser
- 2Tap the three-dot menu in the top right
- 3Select 'Add to Home screen' or 'Install app'
- 4Tap 'Add' or 'Install' to confirm
- 5Launch Cranium from your home screen or app drawer
Desktop (Chrome/Brave)
- 1Open Cranium in Chrome or Brave browser
- 2Look for the install icon in the address bar (⊕ or computer icon)
- 3Click the install icon and select 'Install'
- 4Cranium will open in its own window
- 5Access it from your taskbar, dock, or applications folder
Why Install?
Fair, Transparent Pricing
Choose the plan that fits your needs. Built sustainably, funded by users like you.
Local-Mode
Perfect for personal local note-taking.
- Unlimited local notes
- File System Access API
- Unlimited Workspaces
- Full offline access
- No account required
Cloud Free
Sync your notes across devices with basic cloud features.
- 50 cloud notes
- Bi-directional linking
- 50MB cloud storage
- Cloud sync
- Community support
Cloud Pro
billed yearly (€36/year)
Unlock unlimited cloud storage and advanced features.
- All Cloud Free features
- 5GB cloud storage
- Unlimited notes
- Version history
- Priority support
- EU data hosting
100% user-supported • Built in the Netherlands • Hosted in the EU
Frequently Asked Questions
Find answers to common questions about Cranium.
Ready to Build Your Second Brain?
Start organizing your knowledge, connecting ideas, and building your personal network of insights with Cranium.
No credit card required • Local-first design • Works offline