Dagster is an open-source data orchestrator for building, running and monitoring data pipelines. Pipelines are defined as Python code around the data assets they produce, such as tables, datasets, ML models and reports; Dagster tracks dependencies and lineage and provides observability, diagnostics and a catalogue. It has native integrations with tools such as dbt, Snowflake and Fivetran. You can install the open-source version from PyPI and run it yourself, or use Dagster+, the managed offering, in Serverless mode or in Hybrid mode, where your own compute keeps running and Dagster hosts the control plane.
Dagster is licensed under the Apache License 2.0 and developed by Dagster Labs, a US company. In July 2026 Prefect announced it would acquire Dagster Labs; the project says the open-source project and Dagster+ continue. Self-hosting keeps everything under your control. Dagster+ EU hosts the control plane, metadata and operational data in European data centres (region eu-north-1), for both Serverless and Hybrid; under Hybrid only orchestration metadata flows to Dagster+. The provider remains a US company.