Datadef.io – Canvas for data lineage and metadata management

In plain words

Datadef.io is a canvas-based tool for mapping data lineage and metadata across data warehouses, dbt models, and SQL environments. Designed for data engineers, architects, and project managers, it provides interactive visualization of table relationships, automatic dependency tracking, and centralized metadata management including ownership and KPIs. The tool generates documentation that stays synchronized with data models and allows teams to export and share information beyond scattered spreadsheets and PDFs.

written from the facts on this page · September 2026

From the sources

Datadef helps data teams design and document their data before it exists. Instead of auto-generated lineage and stale docs, you model tables, metrics, and relationships on a visual canvas, and documentation stays in sync as things evolve. It’s lightweight, collaborative, and built for how data teams actually work.

AI-powered data architecture diagrams and lineage tracking. Describe your stack, get professional diagrams instantly.

Describe it below and get an editable diagram in seconds — or connect the agent in your editor and it draws straight from your repo. Data platforms, cloud infrastructure, system design. A real MCP server. Claude Code, Cursor or Codex creates, edits and exports diagrams, reading your repo for context. claude mcp add datadef https://datadef.io/mcp --header "Authorization: Bearer dd_live_YOUR_KEY" Copy then just ask Connect the repo, pick a branch or a tag. Datadef draws the diagram, writes the doc, and keeps both current. A platform in HCL is real but unreadable. Connect the repo and Datadef parses it, then draws the infrastructure the way the repo is organized: stacks, modules, resources,…from datadef.io

In the maker’s words, at launch

Hi HN, I’ve been working on https://datadef.io, a tool to help data team (engineer, architect, project manager) make sense of their data universe. The problem: - Data models (dbt, SQL, warehouses) often grow into a tangled mess of tables, joins, and undocumented assumptions. - Lineage is either scattered…

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