Laying out the streets…STEP 1 OF 3

Line9 · House #23,517

Mermaid diagrams – ready-to-use layout – no editing needed.

In the Understanding code and keeping docs current neighborhood (Developer). In town since 27 Sept 2026.

Nobody has claimed this house yet. Tablif records every new product and gives it a house; when its owner claims it, the lights go on.

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What Tablif read on Line9's site

Line9 describes itself as: “Line9 — Keep Mermaid, fix the layout”

What it is

Calls itself “publishing system” and “rendering engine”.

  • Calls itself: publishing system · rendering engine
“Line9 is a rendering engine and publishing system for Mermaid diagrams.”

Where it puts itself

Publishes a comparison page.

“Line9 uses Mermaid's own parser to read your diagram, then discards Mermaid's rendering pipeline and lays the diagram out from scratch”
“See it side by side: vs mermaid.live → -> https://line9.ai/compare/line9-vs-mermaid-live”

What it costs

Monthly subscription and yearly plan. A free tier, free forever. 12 prices listed on its pages, from $10 to $240.

  • Monthly: yes
  • Yearly: yes
  • Free plan: free forever
  • Price: 12 prices, from $10 to $240
“Early-adopter rate Annual · 2 months free Monthly $20 $10 per seat / mo · billed $120/yr”
“See full pricing → $12 / seat for early adopters — locked in while it lasts.”

Who it sells to

Built for solo users and teams.

  • Company size: solo / indie · teams
“Personal-use CLI — watermarked, no signup”
“Commercial-use CLI for agent and CI workflows”

How it runs

A bot, command-line tool and web app for Linux, Windows and macOS. Runs locally and works offline. Hosted in the cloud. Distributed through the Homebrew. AI is a side feature.

  • Kind: bot · cli · web
  • Runs on: Linux · Windows · macOS
  • Runs where: cloud / hosted · on the device, offline
  • Distributed via: Homebrew
  • AI role: a side feature
“It ships as a free web editor at https://line9.ai/diagram, as a CLI for local and agent-driven workflows, and as a hosted MCP server so assistants can render Line9 diagrams inside the conversation.”
“Install on macOS / Linux $ curl -fsSL https://line9.ai/install.sh | sh Copy”

What it works with

Integrates with ChatGPT, Claude Code and Codex. Replaces mermaid.live. Names Cursor and VS Code on its pages.

  • Integrates with: ChatGPT · Claude Code · Codex
  • Replaces: mermaid.live
  • Names: Cursor · VS Code
“Connect from claude.ai and Claude Desktop, ChatGPT (developer mode), Cursor, and VS Code.”
“Line9 complements the AI that you already use — Claude Code, Cursor, Codex, etc.”

What it offers as proof

Live, no waitlist. Try it without signing up. Publishes docs and a blog.

  • Trial asks for: nothing
“The web viewer at line9.ai is free with no signup, and the CLI (line9 render) is free for personal use (with watermarked images).”
“The web viewer needs no account.”

Sources

Tablif read these pages, last on 10 Oct 2026. Everything above is what the product says about itself; Tablif does not verify every claim.

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