Astronomer costs $15/mo.
These cost $0.
4 free alternatives to Astronomer, checked for license, recent activity and real adoption. Each one tells you the catch, so you can switch with your eyes open.
The top-rated free, open-source replacement for Astronomer is Kestra (Open Source Open Source). Across this category, 4 self-hostable tools are available (including Kestra and Prefect). Switching a 5-person team saves up to $900/year compared to Astronomer's $15/mo subscription.
The catch: Requires self-hosting setup, updates, and server maintenance compared to managed Astronomer.
Astronomer vs Free Alternatives
Quick side-by-side comparison · $0/mo vs $15/mo
| Alternative | Type | License | Where It Runs | Stars | Head-to-Head |
|---|---|---|---|---|---|
| Kestra | open source | Open Source | Self-host | ★ 30.2k | Astronomer vs Kestra → |
| Prefect | open source | Apache-2.0 | Self-host | ★ 24.1k | Astronomer vs Prefect → |
| Mage | open source | Open Source | Self-host | ★ 8.8k | Astronomer vs Mage → |
| Dagu | open source | Open Source | Self-host | ★ 4.5k | Astronomer vs Dagu → |
The picks
4 open source · ranked by fit
- 01
Kestra
open sourceOpen SourceSelf-host30.2knov 2026YAML-based orchestration platform with 1400+ plugins for running data pipelines, AI workflows, and infrastructure automation across teams at scale.
The catch vs AstronomerRequires self-hosting setup, updates, and server maintenance compared to managed Astronomer.
Install, platforms & data +
- platforms
- webself-hosteddocker to self-host
- install
- Clone https://github.com/kestra-io/kestra or deploy with Docker Compose
- setup
- Deploy via Docker or binary release from GitHub and configure environment variables.
- your data
- All application data and configuration live on your own server or local database.
- checked
- 2026-11-07
- 02
Prefect
open sourceApache-2.0Self-host24.1knov 2026Orchestrate data pipelines, ML jobs, and agent workflows in plain Python with automatic retries, scheduling, and a unified UI for every run across your infrastructure.
The catch vs AstronomerRequires self-hosting setup, updates, and server maintenance compared to managed Fivetran.
Install, platforms & data +
- platforms
- webself-hosteddocker to self-host
- install
- Clone https://github.com/prefecthq/prefect or deploy with Docker Compose
- setup
- Deploy via Docker or binary release from GitHub and configure environment variables.
- your data
- All application data and configuration live on your own server or local database.
- checked
- 2026-11-07
- 03
Mage
open sourceOpen SourceSelf-host8.8knov 2026Open-source data pipeline platform for effortless data integration, transformation, and orchestration using Python, SQL, and R.
The catch vs AstronomerRequires self-hosting setup, updates, and server maintenance compared to managed Astronomer.
Install, platforms & data +
- platforms
- webself-hosteddocker to self-host
- install
- Clone https://github.com/mage-ai/mage-ai or deploy with Docker Compose
- setup
- Deploy via Docker or binary release from GitHub and configure environment variables.
- your data
- All application data and configuration live on your own server or local database.
- checked
- 2026-11-07
- 04
Dagu
open sourceOpen SourceSelf-host4.5knov 2026Single-binary workflow orchestrator that runs scheduled DAGs locally or over SSH, with retries, human tasks, a built-in Web UI, and file-based state storage.
The catch vs AstronomerRequires self-hosting setup, updates, and server maintenance compared to managed Astronomer.
Install, platforms & data +
- platforms
- webself-hosteddocker to self-host
- install
- Clone https://github.com/dagucloud/dagu or deploy with Docker Compose
- setup
- Deploy via Docker or binary release from GitHub and configure environment variables.
- your data
- All application data and configuration live on your own server or local database.
- checked
- 2026-11-07
Astronomer Head-to-Head Comparisons (2027)
Side-by-side trade-off breakdowns · 4 free alternatives
Frequently Asked Questions
Direct answers · Astronomer open-source replacements
What is the best free alternative to Astronomer?+
The top free alternative to Astronomer is Kestra (open source, Open Source). YAML-based orchestration platform with 1400+ plugins for running data pipelines, AI workflows, and infrastructure automation across teams at scale. Other popular Astronomer replacements include Prefect, Mage, Dagu.
Can I self-host a free replacement for Astronomer?+
Yes. Of the 4 free alternatives to Astronomer, 4 can be self-hosted on your own server or local machine: Kestra (Open Source), Prefect (Apache-2.0), Mage (Open Source), Dagu (Open Source).
How much does switching from Astronomer to a free alternative save?+
Astronomer starts at $15/month per seat ($180/year). Switching a 5-person team to a free alternative like Kestra saves $900 per year in software subscription fees.
Should I vibe-code or build my own Astronomer clone from scratch?+
Our build verdict for Astronomer is NO (use a free alternative, save the tokens). Instead of paying recurring SaaS fees for Astronomer or rebuilding it from scratch, deploy one of the 4 battle-tested open-source alternatives like Kestra.
What is the catch when switching from Astronomer to Kestra?+
Requires self-hosting setup, updates, and server maintenance compared to managed Astronomer.
