alternatives to
Weights & Biases' toolkit for tracing, evaluating and monitoring LLM applications. A closed product from Weights & Biases.
| Tool | Fit | Stars | Licence | Terms | Self-hosted | Language | Latest | Last push |
|---|---|---|---|---|---|---|---|---|
| Langfuse | Full replacement | 35k | Other | Open core | Yes | TypeScript | v4.53.0 | 2026-10-06 |
| Opik | Full replacement | 22k | Apache-2.0 | Open source | Yes | Python | 2.2.92 | 2026-10-06 |
| Arize Phoenix | Full replacement | 12k | Other | Source available | Yes | Python | arize-phoenix-v20.19.0 | 2026-10-06 |
3 alternatives
🪢 Open source agent evals & observability: Trace, evaluate, and improve LLM applications with one open platform.
Tracing and evaluations of LLM calls, with SDKs for Python and JavaScript.
Debug, evaluate, and monitor your LLM applications, RAG systems, and agentic workflows with comprehensive tracing, automated evaluations, and production-ready dashboards.
Tracing and evaluations of LLM calls, with production monitoring dashboards.
AI Observability & Evaluation
Tracing and evaluations of LLM calls, built on OpenInference instrumentation.