Open-source agent tracing, evals and prompt management.
WebsiteProvisional comparison
Langfuse vs Braintrust
Langfuse is provisional S-tier and Braintrust is provisional A-tier on Agent Observability & Evals. Rankings are never for sale.
Full Agent Observability & Evals tier list
AI observability and evals platform for tracing production and catching regressions.
Website| Field | Langfuse | Braintrust |
|---|---|---|
| Tier | S · provisional | A · provisional |
| Why | Leading open-source observability (35k+ stars), self-hostable. | Eval-first workflow popular with AI product teams. |
| Pricing | open-source / freemium cloud · starts at $29/mo | freemium · starts at $249/mo |
| GitHub stars | 35,875 | — |
| Last push | Oct 15, 2026 | — |
| Last verified | Oct 15, 2026 | Oct 15, 2026 |