Our verdict
A well-maintained, widely adopted project. This assessment is derived from GitHub's own repository metrics on 2026-08-24, not from hands-on testing.
LangChain is the agent engineering platform, built in Python. It has 144,911 stars and 3,725 contributors, and it was pushed to within the last few weeks. The MIT licence puts no real constraint on commercial use. The most recent tagged release is langchain-perplexity==1.4.1, from 2026-08-21. Figures come from the GitHub API on 2026-08-26 and refresh daily.
Reviewed by AI Review Rating from GitHub API data How we score
Repository
- Licence
- MIT
- Language
- Python
- Last push
- 2026-08-24
Releases
-
langchain-perplexity==1.4.1langchain-perplexity==1.4.1 -
langchain==1.3.16langchain==1.3.16 -
langchain-fireworks==1.6.0langchain-fireworks==1.6.0 -
langchain-anthropic==1.6.1langchain-anthropic==1.6.1 -
langchain-openai==1.6.0langchain-openai==1.6.0 -
langchain-core==1.6.0langchain-core==1.6.0
Pros and cons
Pros
Pricing
- Free tierYes
- LicenceMIT
- Self-hostYes, source is public
- Public price listYes
We do not republish prices we have not checked by hand, because automated price extraction proved unreliable enough to mislead. The vendor’s own page has the current figures. Why we do this
View pricing on docs.langchain.comChangelog
On video
What users actually say
- Kick‑starting LangChain AI agent JS web app prototypes with a boilerplate Reddit · N/A
- Deep dive into LangChain Tool calling with LLMs Reddit · N/A
- Built a Research and Action Agent That Is 2x faster than ChatGPT Agent. Reddit · N/A
- Moving LangChain agents to prod: How are you handling real-time guardrails and compliance? Reddit · N/A
- What is an AI Agent (as of 2025)? Reddit · 2025
We link to discussions rather than reproducing them. Opinions belong to their authors.
User reviews
No one has reviewed LangChain here yet. Reviews are moderated before they appear, and our own score is editorial and separate from user ratings, though once reviews land they do lift it.
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Side by side
| Tool | Our score | From | Free tier | Best for | |
|---|---|---|---|---|---|
| LangChain this page | 8.4 | $1 | Yes | ||
| 🥇Spine | 8.3 | - | Yes | ||
| 🥈ECC | 8.1 | - | Yes | ||
| 🥉Browser Use | 8.0 | - | Yes | ||
| Claude Mem | 7.8 | - | Yes | ||
| Langflow | 7.8 | - | Yes | ||
| DeepSeek Harness | 7.7 | - | Yes |
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Questions
Is LangChain free?
Yes. LangChain advertises a free tier on its own site.
How much does LangChain cost?
LangChain publishes pricing on its own site. We deliberately do not republish prices we have not verified by hand, because automated price extraction proved unreliable enough to mislead. Use the link on this page for current figures.
Is LangChain open source?
Yes. LangChain is a public repository released under MIT. You can self-host or inspect the source directly.
How is LangChain scored here?
LangChain scores 8.4 out of 10. That comes from a desk review of public evidence, which is capped at 8.5 out of 10: public pricing, documentation, maintenance signals and how much we could actually verify. Affiliate relationships are excluded from scoring entirely. The full rubric is published on our methodology page.