Best Alternatives to LangSmith
Explore 4 top-rated alternatives to LangSmith in the llm observability category. Compare features, pricing, and find the perfect fit for your needs.
About LangSmith
LangSmith helps developers trace, evaluate, test, and monitor applications built with language models and agent workflows.
Free
Top Recommended Alternatives
Langfuse
LLM Observability
From
FreeOpen-source LLM engineering platform that captures traces, runs evaluations, and helps teams analyze cost, latency, and quality across production AI apps.
Key Strengths:
- ✓Purpose-built LLM data model — traces, generations, evaluations — beats generic APM
- ✓MIT-licensed and self-hostable, which clears procurement in regulated industries
Arize Phoenix
AI Observability
From
FreeArize Phoenix is an open-source AI observability and evaluation platform for tracing, testing, and improving LLM applications and agents.
Key Strengths:
- ✓Open-source Phoenix can run locally or on controlled infrastructure without a software license fee.
- ✓OpenTelemetry tracing reduces instrumentation lock-in.
Braintrust
AI Evaluation
From
FreeBraintrust review 2026: unified evals, prompt workbench, observability, and AI proxy used by OpenAI, Stripe, Notion — features, pricing, pros, cons.
Key Strengths:
- ✓Genuinely consolidates four toolchains into one — fewer vendors, one UI, one bill (above the proxy line)
- ✓Eval review UI is best-in-class for diffing prompt and model changes against curated datasets
Helicone
AI Monitoring
From
FreeOpen-source LLM observability and gateway platform offering one-line integration, request logging, prompt management, evals, and a multi-provider proxy.
Key Strengths:
- ✓Truly one-line integration — fastest path to LLM logging in the market
- ✓Open source under Apache 2.0 with viable self-host story (not just open-core marketing)
More LLM Observability Alternatives
Quick Comparison
Why Consider LangSmith Alternatives?
While LangSmith is a popular choice in the llm observability category, exploring alternatives can help you find a tool that better matches your specific needs, budget, or workflow preferences.
Common reasons to explore alternatives include:
- Different pricing models or more affordable options
- Specific features that LangSmith may not offer
- Better integration with your existing tools
- Performance or user experience preferences
- Regional availability or support requirements
Compare the tools above to find the best fit for your specific use case.
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