# 4 Best Open Source Alternatives for Astronomer

Canonical: https://caniforkit.com/astronomer
Last updated: 2026-11-07

Looking for the best open source alternative for Astronomer? Compare 4 verified free and open source alternatives to Astronomer (Kestra, Prefect, Mage) with license details, self-hosting requirements, and practical trade-offs.

## Astronomer Overview & Subscription Cost
- **Product**: Astronomer
- **Category**: [automation](https://caniforkit.com/category/automation)
- **Paid Subscription Price**: $15/month per seat
- **1-Seat Annualized Cost**: $180/year
- **5-Person Team Annualized Cost**: $900/year
- **10-Person Team Annualized Cost**: $1,800/year
- **Can I Vibe-Code / Rebuild It Myself?**: NO (use a free alternative, save the tokens)
- **Rebuild Verdict**: 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.

## Verified Free & Open Source Alternatives

| Alternative | Type | License | Runs On | GitHub Stars | Head-to-Head |
| --- | --- | --- | --- | --- | --- |
| [Kestra](https://caniforkit.com/fork/kestra) | Open Source | Open Source | Self-host | ★ 30.2k | [Compare vs Astronomer](https://caniforkit.com/vs/astronomer-vs-kestra) |
| [Prefect](https://caniforkit.com/fork/prefect) | Open Source | Apache-2.0 | Self-host | ★ 24.1k | [Compare vs Astronomer](https://caniforkit.com/vs/astronomer-vs-prefect) |
| [Mage](https://caniforkit.com/fork/mage) | Open Source | Open Source | Self-host | ★ 8.8k | [Compare vs Astronomer](https://caniforkit.com/vs/astronomer-vs-mage) |
| [Dagu](https://caniforkit.com/fork/dagu) | Open Source | Open Source | Self-host | ★ 4.5k | [Compare vs Astronomer](https://caniforkit.com/vs/astronomer-vs-dagu) |

## In-Depth Alternative Profiles

### Kestra
- **Fork Page**: [Kestra Profile](https://caniforkit.com/fork/kestra)
- **Head-to-Head Comparison**: [Astronomer vs Kestra](https://caniforkit.com/vs/astronomer-vs-kestra)
- **Official Website**: https://kestra.io/
- **Source Code Repository**: https://github.com/kestra-io/kestra
- **License**: Open Source
- **Runs On**: Self-host
- **GitHub Stars**: 30.2k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: web, self-hosted, docker to self-host
- **Summary**: YAML-based orchestration platform with 1400+ plugins for running data pipelines, AI workflows, and infrastructure automation across teams at scale.
- **The Catch vs Astronomer**: Requires self-hosting setup, updates, and server maintenance compared to managed Astronomer.
- **Installation**: 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.
- **Data Storage**: All application data and configuration live on your own server or local database.

### Prefect
- **Fork Page**: [Prefect Profile](https://caniforkit.com/fork/prefect)
- **Head-to-Head Comparison**: [Astronomer vs Prefect](https://caniforkit.com/vs/astronomer-vs-prefect)
- **Official Website**: https://prefect.io/
- **Source Code Repository**: https://github.com/PrefectHQ/prefect
- **License**: Apache-2.0
- **Runs On**: Self-host
- **GitHub Stars**: 24.1k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: web, self-hosted, docker to self-host
- **Summary**: Orchestrate 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 Astronomer**: Requires self-hosting setup, updates, and server maintenance compared to managed Fivetran.
- **Installation**: Clone https://github.com/prefecthq/prefect or deploy with Docker Compose
- **Setup**: Deploy via Docker or binary release from GitHub and configure environment variables.
- **Data Storage**: All application data and configuration live on your own server or local database.

### Mage
- **Fork Page**: [Mage Profile](https://caniforkit.com/fork/mage)
- **Head-to-Head Comparison**: [Astronomer vs Mage](https://caniforkit.com/vs/astronomer-vs-mage)
- **Official Website**: https://www.mage.ai/
- **Source Code Repository**: https://github.com/mage-ai/mage-ai
- **License**: Open Source
- **Runs On**: Self-host
- **GitHub Stars**: 8.8k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: web, self-hosted, docker to self-host
- **Summary**: Open-source data pipeline platform for effortless data integration, transformation, and orchestration using Python, SQL, and R.
- **The Catch vs Astronomer**: Requires self-hosting setup, updates, and server maintenance compared to managed Astronomer.
- **Installation**: 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.
- **Data Storage**: All application data and configuration live on your own server or local database.

### Dagu
- **Fork Page**: [Dagu Profile](https://caniforkit.com/fork/dagu)
- **Head-to-Head Comparison**: [Astronomer vs Dagu](https://caniforkit.com/vs/astronomer-vs-dagu)
- **Official Website**: https://dagu.sh/
- **Source Code Repository**: https://github.com/dagucloud/dagu
- **License**: Open Source
- **Runs On**: Self-host
- **GitHub Stars**: 4.5k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: web, self-hosted, docker to self-host
- **Summary**: Single-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 Astronomer**: Requires self-hosting setup, updates, and server maintenance compared to managed Astronomer.
- **Installation**: Clone https://github.com/dagucloud/dagu or deploy with Docker Compose
- **Setup**: Deploy via Docker or binary release from GitHub and configure environment variables.
- **Data Storage**: All application data and configuration live on your own server or local database.

## Frequently Asked Questions

### 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.

### 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.

### What is the catch when switching away from Astronomer?
While Kestra replaces core Astronomer features without subscription fees, the real-world trade-off is: Requires self-hosting setup, updates, and server maintenance compared to managed Astronomer.

## Related

- [automation Software Category Hub](https://caniforkit.com/category/automation)
- [All Paid SaaS Alternatives Index](https://caniforkit.com/alternatives)
- [Self-Hosted Software Directory](https://caniforkit.com/self-hosted)
- [Homepage](https://caniforkit.com)