Agenta vs LangSmith
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
AI tool · Open source
An open-source LLMOps platform combining a prompt playground, prompt versioning, evaluations and tracing.
AI tool · Freemium
LangChain's platform for tracing, evaluating and monitoring LLM apps, with a prompt hub and playground.
The short answer
Choose Agenta if you need…
- Teams wanting a self-hostable prompt platform
- Systematic prompt evaluation
Choose LangSmith if you need…
- LangChain and LangGraph users
- Dataset-based evaluation
Side-by-side
| Agenta | LangSmith | |
|---|---|---|
| Type | Prompting · Prompt managers | Prompting · Evaluation & observability |
| Price | Open source | Freemium |
| Platforms | Web, Self-hosted, API | Web, API |
| Works with | LangChain, OpenAI | LangChain, OpenAI |
| Hands-on tested by us | Not yet | Not yet |
| Last checked | 2026-10-29 | 2026-10-29 |
What each one is
Agenta
An open-source LLMOps platform combining a prompt playground, prompt versioning, evaluations and tracing. Good all-in-one open option. Smaller community than the biggest players, so expect fewer integrations.
LangSmith
LangChain's platform for tracing, evaluating and monitoring LLM apps, with a prompt hub and playground. Deep tooling, especially inside the LangChain ecosystem. Less compelling if you don't use LangChain.
Best for
Agenta
- Teams wanting a self-hostable prompt platform
- Systematic prompt evaluation
LangSmith
- LangChain and LangGraph users
- Dataset-based evaluation
Strengths
Agenta
- Prompt playground and versioning
- Human and automatic evaluation
- Tracing
- Self-hosting
LangSmith
- Detailed run traces
- Datasets and evaluators
- Prompt hub and playground
- Production monitoring
Frequently asked questions
What is the difference between Agenta and LangSmith?
Agenta: An open-source LLMOps platform combining a prompt playground, prompt versioning, evaluations and tracing. LangSmith: LangChain's platform for tracing, evaluating and monitoring LLM apps, with a prompt hub and playground. Agenta suits teams wanting a self-hostable prompt platform, while LangSmith suits langchain and langgraph users.
Are Agenta and LangSmith free?
Agenta: Open source. LangSmith: Freemium.
What are other alternatives to Agenta and LangSmith?
Other options people compare them with include PromptLayer, PromptHub, Langfuse, Arize Phoenix, Opik.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.