head to head · open source
langchain vs neo
langchain has 148,892 GitHub stars, 25,031 forks, 492 open issues and last shipped yesterday. neo has 3,296 stars, 261 forks, 140 open issues and last shipped yesterday. langchain leads on adoption by 4,417% (148,892 vs 3,296 stars). langchain is written in Python under MIT; neo is written in JavaScript under MIT. langchain has attracted 17% as many forks as stars, neo 8%. langchain 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.
← all 20902 open source comparisons
Side by side
| langchain | neo | |
|---|---|---|
| GitHub stars | ★ 149K | ★ 3.3K |
| License | MIT | MIT |
| Written in | Python | JavaScript |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 25K | ⑂ 261 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick langchain if
- You weight community size — 149K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick neo if
- You want the neo feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches JavaScript
- You evaluated both and neo fits your workflow better
About langchain
The agent engineering platform. LangChain is a framework for building agents and LLM powered applications. It helps you chain together interoperable components and third party integrations to simplify AI application development — all while future proofing decisions as the underlying technology evolves. [!TIP] Just getting started? Check out Deep Agents — a higher level package built on LangChain for agents that have built in capabilities for common usage patterns such as planning, subagents, file system usage, and more. Quickstart If you're looking for more advanced customization or agent orchestration, check…
read the full langchain overview →
About neo
A self evolving software organism Neo.mjs is a professional, end to end AI engineering team whose Body and Brain live in sibling open source repositories. ▶ Watch Neo.mjs — Agent Fleet Manager Where the industry runs one AI agent and gets slop, Neo.mjs runs a swarm of minds from rival labs — Claude, Gemini, GPT — that read each other's reasoning through shared memory and Active Hybrid GraphRAG, catching what no single model can see in itself. Through the Neural Link possession interface, the swarm does not just read code; it inhabits live applications — inspecting semantic runtime state, mutating UI and data in…
More in AI & Machine Learning
Related comparisons
More AI Development Platforms projects
Compare either of these against the rest of the AI Development Platforms field.
Frequently asked questions
Is langchain or neo more popular?
langchain has 148,892 GitHub stars and neo has 3,296. langchain has the larger community by that measure.
Are langchain and neo free?
Both are open source. langchain is licensed under MIT and neo under MIT. Neither carries a licence fee.
What is the difference between langchain and neo?
langchain is written in Python and neo 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, langchain or neo?
Choose langchain if you want the larger community (148,892 stars) or its MIT licence terms. Choose neo if its feature set, stack or MIT licence fits better. Both are self-hostable.