# Langfuse vs Patronus AI — Fit & Features

Canonical: https://trutool.co/compare/langfuse-vs-patronus-ai
Author: Snehil (https://trutool.co/authors/snehil)

Compare Langfuse and Patronus AI by use case, features, limitations, and evaluation questions.

## Compare fit, features, and limitations

### Langfuse
Trace, evaluate, and improve LLM applications with an open-source engineering platform.
Best fit: AI engineers testing agent quality and monitoring production behavior.
- LLM tracing
- Prompt management
- Evaluation datasets
Before you choose: Use representative test cases and inspect evaluator failures. Check trace retention, sensitive-data handling, and usage costs.
Pricing: https://langfuse.com/pricing
- [Read Langfuse profile](https://trutool.co/tools/langfuse): Read Langfuse profile

### Patronus AI
Evaluate and monitor AI outputs for reliability and application-specific risks.
Best fit: AI engineers testing agent quality and monitoring production behavior.
- AI evaluation
- Output monitoring
- Custom evaluators
Before you choose: Use representative test cases and inspect evaluator failures. Check trace retention, sensitive-data handling, and usage costs.
Pricing: https://www.patronus.ai/pricing
- [Read Patronus AI profile](https://trutool.co/tools/patronus-ai): Read Patronus AI profile