Monitoring & Observability
🎯 Langfuse vs Weights & Biases
Community Vote — Which tool wins?
Langfuse
Tool AOpen-source LLM engineering platform for traces, prompts, and metrics.
Starting Price
Open-source + Cloud
Key Strengths
- ✓Fully open-source with self-hosting that has complete feature parity with the cloud version
- ✓Hierarchical tracing captures the full execution tree of complex agent workflows, not just LLM calls
- ✓Prompt management with versioning and production linking creates a tight iteration feedback loop
Weights & Biases
Tool BExperiment tracking and model evaluation used in agent development.
Starting Price
Free + Paid
Key Strengths
- ✓Experiment comparison and visualization capabilities are unmatched — parallel coordinate plots, metric distributions, and run comparisons across thousands of experiments
- ✓Unified platform for both traditional ML training and LLM evaluation eliminates tool sprawl for teams doing both
- ✓W&B Tables provide collaborative data exploration with filtering, sorting, and custom visualizations of evaluation results
Which would you choose for...
Vote in each scenario below