Vektir Model is a data modeling and ERD builder for data engineers. Define entities, relationships, and naming standards — then export to DDL or Mermaid ERD that lives in your repo.
Not a heavyweight modeling tool with a 200-page manual. Designed for the way data engineers actually work — fast, code-friendly, and versionable.
Add entities, define columns with types, and draw relationships visually. One-to-many, many-to-many — the ERD updates in real time as you build.
Export your model as runnable DDL for PostgreSQL, Snowflake,
BigQuery, and more — ready to paste into a migration or drop into
your /migrations folder.
Every model exports to Mermaid's erDiagram
syntax — plain text that renders natively in GitHub READMEs,
Notion, and GitLab.
Enforce snake_case, prefix conventions, and other naming rules as you model. Catch inconsistencies before they end up in a migration and a production incident.
Open the URL, start modeling. No sign-up, no trial, no onboarding flow. Your schema stays in your browser until you choose to export.
Because output is plain-text Mermaid or DDL, you can paste your schema directly into an LLM to generate queries, suggest indexes, or write dbt models.
From greenfield schema design to keeping docs in sync with production.
Design your tables and relationships visually before writing a single line of SQL. Export DDL when you're ready to run your first migration.
Map out your fact and dimension tables in Snowflake or BigQuery. Export as Mermaid ERD and commit it next to your dbt project.
Commit your schema.mmd to the repo. Reviewers see the ERD rendered directly in GitHub diffs — no tool access needed.
Keep your ERD in the same repo as the code it describes. It renders in GitHub, updates with your migrations, and never goes stale in a Confluence page nobody visits.
Vektir Model exports to two formats: runnable DDL for your target warehouse and Mermaid ERD syntax for your documentation.
Both are plain text. Both live in Git. Both can be read by a human, an LLM, or a CI pipeline without installing anything.
No install, no account, no onboarding. Open Vektir Model and start building your data model right now.
no account · no install · runs in your browser