CastorDoc vs Grai
CastorDoc
castordoc.comGrai
grai.ioSide by side
| Figure | CastorDoc | Grai |
|---|---|---|
| Price from | — | Free |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| Linux | — | Yes |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 2 | 1 |
| Spec score · Data Lineage Tools | 8.6 (#5) | 8.3 (#7) |
| Company | Coalesce’s company timeline says it acquired CastorDoc and introduced Coalesce Catalog in 2025. | Grai’s privacy policy identifies the operator as Grai.io, Inc. |
| Founded | 2020 | 2021 |
| Headquarters | Paris, France | St. Louis, Missouri, United States |
| Integrations | Listed integrations include Snowflake, Redshift, BigQuery, Synapse, PostgreSQL, MySQL, Databricks, Looker, Tableau, Power BI, and Slack. | Listed connectors include Snowflake, BigQuery, Redshift, Postgres, MySQL, SQL Server, dbt, Fivetran, flat files, Metabase, and Looker (alpha). |
| Intended users | The catalog page describes the product as helping data engineers and analysts make data assets discoverable across an organization. | Grai is presented for people who need to trace and test data relationships across data systems and applications. |
| Lineage | The product provides column lineage and shows how changes affect downstream assets. | Grai says it can automatically build column-level lineage across warehouses and production services. |
Plans
In their own words
Grai
Grai is a data lineage tool for tracing and testing relationships among databases, warehouses, APIs, and dashboards. It can automatically build column-level lineage across warehouses and production services. Centralized validation tests run when upstream data sources change, and GitHub Actions can alert CI/CD workflows when production changes affect warehouses or dbt projects. Listed connectors include Snowflake, BigQuery, Redshift, Postgres, MySQL, SQL Server, dbt, Fivetran, flat files, Metabase, and Looker; the Looker connector is marked alpha. Grai describes itself as open source and self-hostable, with Docker Compose and Kubernetes examples and Helm charts. Grai Cloud is available to run for free. The frontend is a React web application, and the CLI is a Python client for the Grai server. The repository lists an MIT-0 license. The privacy policy says Grai collects email addresses, cookies, and usage data, and names AWS and Google Cloud Platform among its service providers. It says commercially acceptable measures are used to protect personal data but cannot guarantee absolute security. The repository lists [email protected] and points to Slack and a community roadmap for requests and bug reports.