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LangSmith
VerifiedAutomation & Workflow Orchestration · API
Production observability, tracing, and evaluation suite for LLM agent workflows
Free tierAPI availableCloud hosted
Pricing: Free Developer tier includes up to 5,000 trace steps per month; Plus and Enterprise plans for production scale.
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Langfuse
VerifiedDeveloper Frameworks & Infrastructure · API
Open-source LLM observability, prompt management, and evaluation
Open sourceAPI availableSelf-hostable
Pricing: Self-hosted is free (MIT licensed). Managed Cloud includes 50k free traces per month, with Pro at $59 per month.
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