head to head · open source
Prefect vs one
Prefect has 24,110 GitHub stars, 2,630 forks, 858 open issues and last shipped 2 days ago. one has 1,765 stars, 543 forks, 771 open issues and last shipped 2 days ago. Prefect leads on adoption by 1,266% (24,110 vs 1,765 stars). Prefect is written in Python under Apache-2.0; one is written in JavaScript under Apache-2.0. Prefect has attracted 11% as many forks as stars, one 31%. Prefect was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (orchestration), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Prefect | one | |
|---|---|---|
| GitHub stars | ★ 24K | ★ 1.8K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | JavaScript |
| Last push | 2026-11-03 | 2026-11-03 |
| Forks | ⑂ 2.6K | ⑂ 543 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Prefect if
- You weight community size — 24K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick one if
- You want the one feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches JavaScript
- You evaluated both and one fits your workflow better
About Prefect
Installation · Quickstart · Build workflows · Deploy workflows · Prefect Cloud Prefect Prefect is a workflow orchestration framework for building data pipelines in Python. It's the simplest way to elevate a script into a production workflow. With Prefect, you can build resilient, dynamic data pipelines that react to the world around them and recover from unexpected changes. With just a few lines of code, data teams can confidently automate any data process with features such as scheduling, caching, retries, and event based automations. Workflow activity is tracked and can be monitored with a self hosted Prefect…
read the full Prefect overview →
About one
Description OpenNebula is an open source cloud management platform for building and operating private clouds, edge infrastructures, distributed cloud deployments, and AI Factories. It provides a unified platform to manage Virtual Machines, Kubernetes Clusters, and GPU accelerated workloads across on premises, edge, and hybrid environments through a simple yet powerful cloud operating model. Key Features Unified Cloud Management – Manage virtualized, containerized, and AI workloads from a single platform. Flexible Access Interfaces – Web UI, CLI, REST API, Terraform provider, and automation tools. Federated…
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Frequently asked questions
Is Prefect or one more popular?
Prefect has 24,110 GitHub stars and one has 1,765. Prefect has the larger community by that measure.
Are Prefect and one free?
Both are open source. Prefect is licensed under Apache-2.0 and one under Apache-2.0. Neither carries a licence fee.
What is the difference between Prefect and one?
Prefect is written in Python and one in JavaScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Prefect or one?
Choose Prefect if you want the larger community (24,110 stars) or its Apache-2.0 licence terms. Choose one if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.