2025ProductAI
nautilus
Open-source canvas to design, simulate and explain architecture.
A browser-only system design tool where a diagram is a real directed graph, so it can be simulated, load-tested, reviewed by AI and diffed as JSON. No accounts, no backend, no lock-in.
How it works
1
Flow simulation
Watch requests traverse the architecture step by step; cycles, dangling edges and isolated nodes are reported instead of failing silently.
2
Load, capacity and cost
Give nodes capacity, latency and price, push traffic through and see p95 latency, bottlenecks, replica sizing and the monthly bill.
3
Failure injection and AI review
Take a node out and see what survives. A bring-your-own-key assistant can design, extend or review the canvas.
Built with
Next.js
React
TypeScript
React Flow
Tailwindcss