Own your system.
CoCube is a local-first workspace that combines rich notes with a powerful reactive component system.
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This is a real document. Edit it.
Local-first yet collaborative.
Local-first means everything you create is stored privately on your device. Work offline. Sync selectively. Collaborate and publish. No account needed to start.
Reactive expressions.
Build spreadsheet-inspired tools that aren't limited to a grid. Every attribute lives in a cell. Use references, write expressions, and watch changes cascade. CoCube is a database with an interface that you design.
Composable by design.
Build small, combine freely. Nest components inside components to construct any tool or interface. From simple diagrams to complex systems, your creativity is the limit.
Take rich, private, local notes
Notes you keep for a decade, on a machine you own.
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Markdown blocks, checklists, code, and live inline components — one editable note, stored on your device.
Track a project
Embed reactive tables, diagrams, and custom components into your notes.
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One editable note holding a task tracker and a publishing calendar. Cycle a status, drag a card, or just type — every block reacts in place.
Remember what matters
Memorize the important things with spaced repetition, directly from your notes.
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Highlight a fact, get a card. CoCube brings it back right before you'd forget.
Turn your data into reactive tables
Track anything, from a client database to a list of books you have read.
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Tables allow you to work with typed data. Make changes and see your updates reflect immediately.
Design custom components
Stop waiting for features, easily build the components you need.
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Wire a cell to another and the change propagates. This is how every tool here is made.
Work privately or collaborate in real time
Keep your data private and local, or sync it to enable cross-device access and collaboration.
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Two views of one document, syncing through the real CRDT engine.
Push the renderer
Browsers weren't built for dense interactive canvases. CoCube renders on the GPU.
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CoCube uses gpu-accelerated rendering to provide fast performance even with complex data. Try modifying the target.
Everything is a component.
Notes, charts, buttons, whole tools, all built from the same parts.
Build with cells and expressions.
Every attribute lives in a spreadsheet-like cell. Change one, watch the rest react.
Work together. Online or off.
Local-first storage. Work offline. Share only when you choose.
Built solo in Rust over three years.
Your archive opens whether or not you keep paying. Export to open formats anytime.
No account needed to start.
Local-first means you don't even need an account.
Or download the app
The desktop app keeps your documents in a SQLite database on your device.
CoCube works in your browser. Nothing to install.
Open the console