Arcline
Open-source diagram canvas you and your agent edit together.
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Arcline is a friendly, local-first diagram canvas for architecture and flow diagrams. Draw by hand, write diagrams as code with Mermaid, D2, Structurizr or OpenFlow DSL, or hand the canvas to your AI agent over MCP. Claude Code, Cursor, VS Code and Codex can read and edit the same document — every change is one undo step. No account, no cloud. Free and open source.
PH · launched Nov 5, 2026 · 15 upvotes (top 3%) · 0 views
Niche: diagramming and flowchart tools · 116 launches, 6 in the last 7 days ▼ -50% · Explore this niche →
Category and tags
- Horizontal
- Agent / copilot
- Prosumer
- AI-native
- Hobby / open-source project
- Open Source
- GitHub
Visit website ↗ Source listing ↗
More like this: all 116 launches in diagramming and flowchart tools →
Could you build this?
Yes It is a local-first canvas app that wraps existing open-source diagram libraries and parsers (Mermaid, D2) and exposes an MCP interface. A solo builder could assemble this with existing components, though polishing it is substantial work.
Competitors
Other products that read as similar to this one : 236 launches clear the similarity bar, closest 8 shown.
Attention rank: #18 of 237 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 352 days after the earliest competitor.
- OpenFlowKit 2 · ph · 2026-10-13 · 86 upvotes · similarity 0.66
- Arcentry - 3D infrastructure diagrams · ph · 2026-09-24 · 3 upvotes · similarity 0.54
- FlowDiagram · ph · 2026-10-17 · 2 upvotes · similarity 0.52
- arc-draw · github · 2026-09-28 · 31 upvotes · similarity 0.50
- Monospace · ph · 2026-11-13 · 2 upvotes · similarity 0.48
- FlowLine · ph · 2026-09-29 · 2 upvotes · similarity 0.47
- Diagram Studio · ph · 2026-10-08 · 1 upvotes · similarity 0.45
- arkdraw · github · 2026-10-23 · 52 upvotes · similarity 0.44
The niche, labels, vibe code rating and competitor comparison on this page are analysis by Nicheloom. If you use them, please credit nicheloom.com. How you may use our data.