head to head · open source
Langflow vs react-cosmos
Langflow has 155,023 GitHub stars, 10,119 forks, 1,056 open issues and last shipped today. react-cosmos has 8,686 stars, 381 forks, 5 open issues and last shipped 20 days ago. Langflow leads on adoption by 1,685% (155,023 vs 8,686 stars). Langflow is written in Python under MIT; react-cosmos is written in TypeScript under MIT. Langflow has attracted 7% as many forks as stars, react-cosmos 4%. 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 | react-cosmos | |
|---|---|---|
| GitHub stars | ★ 155K | ★ 8.7K |
| License | MIT | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-09-20 | 2026-08-31 |
| Forks | ⑂ 10K | ⑂ 381 |
| 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 react-cosmos if
- You want the react-cosmos feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and react-cosmos 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 react-cosmos
React Cosmos is a sandbox for developing and testing UI components in isolation, built for React developers who want to build, render and verify individual components without launching the full application around them.
read the full react-cosmos overview →
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Frequently asked questions
Is Langflow or react-cosmos more popular?
Langflow has 155,023 GitHub stars and react-cosmos has 8,686. Langflow has the larger community by that measure.
Are Langflow and react-cosmos free?
Both are open source. Langflow is licensed under MIT and react-cosmos under MIT. Neither carries a licence fee.
What is the difference between Langflow and react-cosmos?
Langflow is written in Python and react-cosmos 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 react-cosmos?
Choose Langflow if you want the larger community (155,023 stars) or its MIT licence terms. Choose react-cosmos if its feature set, stack or MIT licence fits better. Both are self-hostable.