head to head · open source
Langflow vs Structr
Langflow has 154,943 GitHub stars, 10,108 forks, 1,056 open issues and last shipped yesterday. Structr has 830 stars, 161 forks, 5 open issues and last shipped 8 days ago. Langflow leads on adoption by 18,568% (154,943 vs 830 stars). Langflow is written in Python under MIT; Structr is written in Java under a custom or non-standard licence. Langflow has attracted 7% as many forks as stars, Structr 19%. 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 | Structr | |
|---|---|---|
| GitHub stars | ★ 155K | ★ 830 |
| License | MIT | Custom / other |
| Written in | Python | Java |
| Last push | 2026-09-17 | 2026-09-10 |
| Forks | ⑂ 10K | ⑂ 161 |
| 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 Structr if
- You want the Structr feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches Java
- You evaluated both and Structr 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 Structr
Structr is an open source, generic low code development and runtime platform built on a graph database, aimed at developers and teams who need to model, build, and operate fully custom applications rather than configure a prebuilt product.
read the full Structr overview →
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Frequently asked questions
Is Langflow or Structr more popular?
Langflow has 154,943 GitHub stars and Structr has 830. Langflow has the larger community by that measure.
Are Langflow and Structr free?
Both are open source. Langflow is licensed under MIT, and Structr has no licence declared in this registry. Both are free to self-host.
What is the difference between Langflow and Structr?
Langflow is written in Python and Structr in Java. 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 Structr?
Choose Langflow if you want the larger community (154,943 stars) or its MIT licence terms. Choose Structr if its feature set, stack or Custom / other licence fits better. Both are self-hostable.