SaaS stacks
LangSmith vs Langfuse vs Helicone: LLM observability for Next.js (2026)
A developer-lens 2026 comparison of LangSmith, Langfuse, and Helicone for LLM observability in a Next.js app: gateway vs OpenTelemetry instrumentation, open source vs proprietary, real pricing, and which to pick.
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