Vellum
Diagram editor combining whiteboard speed with formal documentation quality
Visit vellum.blueprintr.io ↗What is Vellum?
Vellum is a diagram editor that bridges the gap between quick sketching and polished technical documentation. It offers the speed of freehand drawing with the precision needed for architecture and flow diagrams, supporting multiple shape libraries including UML, BPMN, flowchart, and racks. Users can choose between grid-based snapping for structured diagrams or whiteboard mode for free placement.
The tool stores diagrams in YAML format and includes a graph section for diagram-as-code workflows similar to Mermaid, but with full layout authoring freedom. The maker notes that Claude assisted with geometry calculations and other technical components during development.
Momentum
Daily activity over the last 30 days: upvotes, unique visits, new GitHub stars and Hacker News points.
How do we know it's vibe coded?
vibetrend discovered Vellum automatically. Evidence: HN post: "I used Claude to help with some of the more challenging geometry based elements". View source.
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