Replace / Astronomer
Best free Astronomer alternatives (open source, self-hosted) 2026
The best open-source alternative to Astronomer is Apache Airflow or Dagster, self-hosted on Railway. Pipelines you schedule. Airflow is Apache-2.0; Dagster is Apache-2.0 — Astronomer without the Airflow seat.
Estimated save $1,200 a year.
Open the stackStart on Railway
How Astronomer compares
| Astronomer | Apache Airflow / Dagster | |
|---|---|---|
| Pricing model | Hosted subscription | Open-source or fair-code license; you pay the host |
| Hosting | Vendor cloud | Self-hosted on Railway or any VPS |
| Rough monthly cost | Public list price not verified this run | Hosting only — no SaaS seat meter in this repo |
- Apache Airflow
Apache-2.0 workflow authoring, scheduling, and monitoring
- Dagster
Apache-2.0 data-asset orchestrator if you want that lineage
FAQ
- What is the best free open-source Astronomer alternative?
- The best open-source alternative to Astronomer is Apache Airflow or Dagster, self-hosted on Railway. Pipelines you schedule. Airflow is Apache-2.0; Dagster is Apache-2.0 — Astronomer without the Airflow seat.
- Is it free?
- The Apache Airflow / Dagster licenses are open source or fair-code. You still pay hosting (Railway or any VPS) and any APIs the stack calls. There is no Astronomer seat or task bill on this path.
- Can I migrate from Astronomer?
- Yes. Start with the workflows or data you actually use, then cut over. The Apache Airflow / Dagster stack page has the agent prompt and the cost table; most teams rebuild the slice that matters and leave old Astronomer links until they expire.
- How do I deploy it?
- Open the Apache Airflow / Dagster stack, copy the agent prompt, and deploy on Railway (one service, PORT, and a volume when the app needs disk). Placeholder: Airflow (webserver + scheduler + worker + Postgres + a volume for DAGs) or Dagster + a database. This is several processes. No one-click template in this repo yet — Start on Railway. ELT stays on /stacks/meltano-elt; transforms on /stacks/dbt-core-transform.
- What does this replace?
- Astronomer. The published small-team estimate on this stack is $1,200 a year.
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