A static architecture diagram shows you all the boxes and arrows at once, which is often more confusing than helpful when you're trying to explain how data actually flows through a system. Flostep lets you build the same kind of diagram but walk through it interactively, one step at a time. Flostep is a browser-based diagramming tool with drag-and-drop components (frontend, service, database, cache, queue, external API, or custom blocks), plus code-to-diagram import using a plain-text syntax for people who'd rather describe a system than draw it. Diagrams are interactive and step-through, can be shared as public read-only links or embedded via a single iframe in Confluence, Notion, or a blog, and support async comments and a notes panel for capturing trade-offs. It auto-saves to the cloud and integrates with AI coding tools (Claude, Cursor, VS Code, Windsurf) via MCP. It's aimed at system-design interview prep, documentation, onboarding, and async design reviews, with a free plan (limited diagrams, no credit card) and a Pro plan for unlimited diagrams.
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