View all LLM Observability / DevOps Alternatives
Best Free Alternatives to LangSmith (formerly LangChain+)
Stop paying Free Tier / $39+ per user. Discover professional-grade tools that won't break your budget.
Category: LLM Observability / DevOpsVerified for 2025
Top Recommended Replacements
Langfuse
FREEBest Direct Replacement
Why we like it
The spiritual successor to LangSmith for the open-source community; offers detailed tracing, prompt management, and evaluations; fully self-hostable via Docker; generous free cloud tier (50k traces/mo).
Keep in mind
Setup requires managing your own infrastructure if you choose the self-hosted route.
Arize Phoenix
FREEBest for Evaluation
Why we like it
Focuses heavily on 'Evals' and 'RAG Analysis'; runs locally on your machine with a beautiful UI (no cloud required); excellent for visualizing embedding clusters to find bad retrieval results.
Keep in mind
Less focused on 'Production Monitoring' and more on 'Experimentation/Testing'.
FlowiseAI
FREEBest Low-Code Builder
Why we like it
If you used LangChain to 'build' rather than 'monitor', Flowise is the visual alternative; drag-and-drop UI to create PDF chat bots and agents; exports as an API.
Keep in mind
It is an orchestration tool, not an observability tool (you might actually plug Langfuse *into* Flowise).
Helicone
FREEBest Proxy / Cache
Why we like it
Sit between your app and OpenAI; instantly gives you caching (saving money on repeat queries), cost tracking, and simple logging; one-line code change.
Keep in mind
Lacks the deep 'Step-by-Step' chain debugging of LangSmith or Langfuse.
LangWatch
FREEBest for Privacy
Why we like it
Ensures no sensitive data leaves your perimeter; focuses on detecting PII (Personal Identifiable Information) and hallucinations in real-time.
Keep in mind
Community is smaller than Langfuse.
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