head to head · open source
Langflow vs KeystoneJS
Langflow has 155,023 GitHub stars, 10,119 forks, 1,056 open issues and last shipped today. KeystoneJS has 9,976 stars, 1,265 forks, 138 open issues and last shipped 6 days ago. Langflow leads on adoption by 1,454% (155,023 vs 9,976 stars). Langflow is written in Python under MIT; KeystoneJS is written in TypeScript under MIT. Langflow has attracted 7% as many forks as stars, KeystoneJS 13%. Langflow was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| Langflow | KeystoneJS | |
|---|---|---|
| GitHub stars | ★ 155K | ★ 10.0K |
| License | MIT | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-09-20 | 2026-09-14 |
| Forks | ⑂ 10K | ⑂ 1.3K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Langflow if
- You weight community size — 155K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick KeystoneJS if
- You want the KeystoneJS feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and KeystoneJS fits your workflow better
About Langflow
Langflow is a visual builder platform for designing, testing, and deploying AI agents and retrieval augmented generation (RAG) pipelines. It lives in the Python based generative AI ecosystem and targets developers building intelligent applications. The project provides a low code interface to assemble components—such as LLMs, vector stores, memory modules, and tools—into executable workflows, while also exposing those workflows as APIs or MCP servers for integration into external applications.
read the full Langflow overview →
About KeystoneJS
KeystoneJS is an open source Node.js CMS and application framework written in TypeScript and licensed under the MIT License. It lives in the Node.js, GraphQL, and React ecosystem, and its GitHub description calls it a headless CMS for Node.js. The project addresses the need to build a custom back end without writing all of the common content management plumbing by hand.
read the full KeystoneJS overview →
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Frequently asked questions
Is Langflow or KeystoneJS more popular?
Langflow has 155,023 GitHub stars and KeystoneJS has 9,976. Langflow has the larger community by that measure.
Are Langflow and KeystoneJS free?
Both are open source. Langflow is licensed under MIT and KeystoneJS under MIT. Neither carries a licence fee.
What is the difference between Langflow and KeystoneJS?
Langflow is written in Python and KeystoneJS in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Langflow or KeystoneJS?
Choose Langflow if you want the larger community (155,023 stars) or its MIT licence terms. Choose KeystoneJS if its feature set, stack or MIT licence fits better. Both are self-hostable.