LLM observability and evals: 2 tools compared
Tracing, monitoring and evaluation of the calls an application makes to LLM APIs. Listed by name. A starting price is the vendor's own, as checked on the date shown; it is not monitored.
Open-source platform for tracing, evaluating and debugging LLM applications and agents, with prompt management and datasets. It is available as a hosted service (Langfuse Cloud) or can be self-hosted with Docker Compose or Kubernetes.
Open sourceSelf-hostableFree tierfrom $29.00 per monthchecked Nov 8, 2026
Works with 15 of the LLM providers we trackLangChain's platform for tracing, monitoring and evaluating LLM applications and agents, usable with or without the LangChain framework through its Python and TypeScript SDKs. It is a hosted service; self-hosting is an add-on to the Enterprise plan.
Self-hostableFree tierfrom $39.00 per seat / monthchecked Nov 8, 2026
Works with 6 of the LLM providers we track
| Tool | Pricing model | Free tier | Self-hostable | Open source | Starting price | Works with |
|---|---|---|---|---|---|---|
 LangfuseOpen-source platform for tracing, evaluating and debugging LLM applications and agents, with prompt management and datasets. It is available as a hosted service (Langfuse Cloud) or can be self-hosted with Docker Compose or Kubernetes. | Free tier and paid plans | Yes | Yes | Yes (MIT) | from $29.00 per monthchecked Nov 8, 2026 | 15 of the LLM providers we track |
 LangSmithLangChain's platform for tracing, monitoring and evaluating LLM applications and agents, usable with or without the LangChain framework through its Python and TypeScript SDKs. It is a hosted service; self-hosting is an add-on to the Enterprise plan. | Free tier and paid plans | Yes | Yes | No | from $39.00 per seat / monthchecked Nov 8, 2026 | 6 of the LLM providers we track |
