head to head · open source
Langflow vs d2
Langflow has 155,224 GitHub stars, 10,141 forks, 1,056 open issues and last shipped today. d2 has 25,506 stars, 752 forks, 530 open issues and last shipped 5 days ago. Langflow leads on adoption by 509% (155,224 vs 25,506 stars). Langflow is written in Python under MIT; d2 is written in Go under MPL-2.0. Langflow has attracted 7% as many forks as stars, d2 3%. 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 | d2 | |
|---|---|---|
| GitHub stars | ★ 155K | ★ 26K |
| License | MIT | MPL-2.0 |
| Written in | Python | Go |
| Last push | 2026-09-25 | 2026-09-20 |
| Forks | ⑂ 10K | ⑂ 752 |
| 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 d2 if
- You want the d2 feature set and don't need the biggest community
- You prefer the MPL-2.0 license terms
- Your stack matches Go
- You evaluated both and d2 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 d2
D2 is a modern diagram scripting language, written in Go and released under the MPL 2.0 licence, that turns plain text .d2 files into rendered diagrams such as SVGs, aimed at developers and teams who want their architecture and system diagrams kept as reviewable source rather than as opaque image files.
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Frequently asked questions
Is Langflow or d2 more popular?
Langflow has 155,224 GitHub stars and d2 has 25,506. Langflow has the larger community by that measure.
Are Langflow and d2 free?
Both are open source. Langflow is licensed under MIT and d2 under MPL-2.0. Neither carries a licence fee.
What is the difference between Langflow and d2?
Langflow is written in Python and d2 in Go. 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 d2?
Choose Langflow if you want the larger community (155,224 stars) or its MIT licence terms. Choose d2 if its feature set, stack or MPL-2.0 licence fits better. Both are self-hostable.