head to head · open source
langchain vs opik
langchain has 148,892 GitHub stars, 25,031 forks, 492 open issues and last shipped yesterday. opik has 23,122 stars, 1,923 forks, 258 open issues and last shipped yesterday. langchain leads on adoption by 544% (148,892 vs 23,122 stars). langchain is written in Python under MIT; opik is written in Python under Apache-2.0. langchain has attracted 17% as many forks as stars, opik 8%. opik was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (langchain), so they are genuine substitutes rather than adjacent tools.
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
| langchain | opik | |
|---|---|---|
| GitHub stars | ★ 149K | ★ 23K |
| License | MIT | Apache-2.0 |
| Written in | Python | Python |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 25K | ⑂ 1.9K |
| 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 opik if
- You want the opik feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and opik 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 opik
English 简体中文 Español Français Deutsch 日本語 Opik: Open Source LLM Observability, Evaluation & AI Agent Tracing Opik is the open source LLM observability and evaluation platform for AI agent tracing, LLM evaluation, prompt management, and production monitoring. Built by Comet . Apache 2.0 licensed, free to self host the full platform, with 20,000+ GitHub stars. Website • Slack Community • Twitter • Changelog • Documentation Last updated: 2026 07 17 🚀 What is Opik? • ⚡ Quick Start • 📊 How Does Opik Compare? • ❓ FAQ • 🛠️ Opik Server Installation • 💻 Opik Client SDK • 📝 Logging Traces 🧑⚖️ LLM as a Judge • 🔍…
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Frequently asked questions
Is langchain or opik more popular?
langchain has 148,892 GitHub stars and opik has 23,122. langchain has the larger community by that measure.
Are langchain and opik free?
Both are open source. langchain is licensed under MIT and opik under Apache-2.0. Neither carries a licence fee.
What is the difference between langchain and opik?
langchain is written in Python and opik in Python. 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 opik?
Choose langchain if you want the larger community (148,892 stars) or its MIT licence terms. Choose opik if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.