Cairn is a fast, private, beautiful diagram builder you can run anywhere, no account, no cloud, no lock-in. And you can brand it as your own.
Or €90/year (save 17%). Already a member? Sign in.
Not a mock-up. This is Cairn running in the browser, with shapes, layers, AI and templates.
A modern take on Visio: the power you need, in an interface a non-technical user gets in under a minute.
Auto-routing arrows (elbow / straight / curved) that re-route live. Tab spawns a connected next step; decision branches auto-label Yes / No.
Sticky notes, free text, frames that move their contents, and images you can insert or paste, Miro-style.
Describe a process in plain language and Cairn Pro draws it for you. No API key needed, it just works.
15 categories, flowcharts, business, software, marketing, strategy, project, HR and more, in a searchable gallery.
Full UI in English, Português, Español, Français & Deutsch. Plus command palette, find, lint, layers & presentation mode.
Diagrams stay in your browser. Export PNG / SVG / PDF / JSON / Mermaid, a shareable HTML viewer, or import Mermaid / CSV.
The features that save the most time, in motion.
Type a process in plain words and watch the diagram appear, laid out and connected. No API key, it just works.
Start from a real diagram, not a blank page. Flowcharts, org charts, swimlanes, big end-to-end systems and more, all searchable.
Step through a diagram path node by node to explain it, or present full-screen. Great for reviews and walkthroughs.
Start free. Upgrade when you need the power tools.
Already a member? Sign in
The things that matter day to day, next to the tools most people leave behind.
| What matters | Cairn | Visio | Lucidchart |
|---|---|---|---|
| Starts in seconds, no account | ✓ | ✕ | ✕ |
| AI text-to-diagram built in | ✓ | ✕ | ✓ |
| Private, local-first by default | ✓ | ✕ | ✕ |
| Free version to start | ✓ | ✕ | ✓ |
| Simple, low price | ✓ | ✕ | ✕ |
Visio and Lucidchart are trademarks of their owners. Comparison reflects typical plans as of 2026 and is our honest read; verify current details on their sites.
Everything worth knowing before you start.
Yes. Basic runs fully in your browser and nothing leaves your device. Pro adds optional cloud save so you can open your work anywhere, and you stay in control of what you save.
Not for Basic. Open it and start. You only sign in for Pro features like AI, cloud save and sharing.
Cairn starts in seconds with no account, keeps your diagrams private by default, includes AI text-to-diagram, and costs a fraction of the price. See the comparison above.
Yes. Pro is a simple monthly or yearly subscription you can cancel whenever you like. Your exported diagrams are always yours.
Securely through Stripe, by card. We never see or store your card details.
Yes. The full interface is available in English, Português, Español, Français and Deutsch.
We can ship Cairn under your brand, your name, your logo, your colours, set up for your team and your workflows. Same engine, your product.
