← LLM observability & evals
Compare 4 llm observability & evals APIs
| LangSmith (Plus) LangChain (LangSmith) | Helicone (Pro) Helicone | Langfuse Cloud (Core) Langfuse | Braintrust (Pro) Braintrust | |
|---|---|---|---|---|
| $ / mo · 1M events | $450.00 Unverified sample | $79.00 Unverified sample | $101.00 Verified Oct 6, 2026 | $280.00 Unverified sample |
| Quality | – | – | – | – |
| Speed | – | – | – | – |
| Evaluations | Yes | Yes | Yes | Yes |
| Prompt management | Yes | Yes | Yes | Yes |
| Open source | No | Yes | Yes | No |
| Self-hosting | Yes | Yes | Yes | Yes |
| Retention on the priced plan | — | — | 90 days | 30 days |
| Free tier | Yes | Yes | Yes | Yes |