A agentindex
Comparison

DeepEval (Confident AI) vs Langfuse

A like-for-like, spec-level comparison. Both entries are verified against their docs and repo.

DeepEval (Confident AI)

Open-source unit tests for LLMs.

  • + Pytest-style DX, fits existing test suites
  • + Open source metric library
  • − Confident AI cloud is proprietary
  • − Setup for custom metrics takes work

Langfuse

The most-used open-source LLM observability tool.

  • + Open source and self-hostable
  • + Framework-agnostic via OpenTelemetry
  • − Self-hosting ClickHouse is operational work
  • − Eval features trail dedicated eval tools
Spec DeepEval (Confident AI) Langfuse
Category eval-observability eval-observability
License Apache-2.0 MIT
Open source Yes Yes
Self-hostable Yes Yes
MCP support No No
Pricing free freemium
Starting price Self-host free Self-host free; cloud tier
Models multi multi
Languages python python, typescript
GitHub stars 16.5k 29.8k
Last activity 2026-06-25 2026-06-25