Best AI tools for observability

Braintrust

Featured

Evaluation · Platform (any LLM)

8.9

Eval, monitor, and improve AI products end-to-end.

LangSmith

Evaluation · Platform (any LLM)

8.7

LangChain's eval + observability platform.

Helicone

Evaluation · Platform (any LLM)

8.3

Open-source LLM observability — one-line proxy install.

PromptLayer

Evaluation · Platform (any LLM)

7.9

Lightweight prompt logging + management for OpenAI/Claude apps.

Agenta

Evaluation · Multi-model

Open-source LLMOps platform for prompt engineering, evaluation, and observability in one workspace.

Arize AI

Evaluation · Multi-model

Enterprise observability and evaluation platform for LLM agents and generative AI applications.

Arthur

Evaluation · Multi-model

Open-source toolkit for testing, tracing, and monitoring production AI agents.

Athina AI

Evaluation · Multi-model

Collaborative LLM evaluation and observability platform for teams shipping AI features to production.

Fiddler AI

Evaluation · Fiddler Centor (proprietary evaluators)

Enterprise AI observability and guardrails platform for monitoring agents, LLMs, and ML models in production.

HoneyHive

Evaluation · Multi-model

OpenTelemetry-native observability and evaluation platform for LLM agents in production.

LangFast

Evaluation · Multi-model

No-signup LLM playground for testing, comparing, and versioning prompts against your own API keys.

Langfuse

Evaluation · Model-agnostic

Open-source LLM observability, prompt management, and evaluation in one platform.

MLflow

Evaluation · Multi-model

Open-source platform for tracking, evaluating, and deploying ML models and LLM applications.

Maxim AI

Evaluation · Multi-model

End-to-end evaluation, simulation, and observability platform for shipping production-grade AI agents.

Opik

Evaluation · Multi-model

Open-source LLM observability and evaluation platform for debugging and monitoring AI agents in production.

Parea AI

Evaluation · Multi-model

LLM evaluation, observability, and prompt management platform for teams shipping production AI apps.

Phoenix

Evaluation · Multi-model

Open-source LLM and agent observability platform with tracing, evals, and experimentation built on OpenTelemetry.

Respan (formerly Keywords AI)

Evaluation · Multi-model (500+ via gateway)

LLM engineering platform combining a multi-model gateway with tracing, evals, and prompt management.

Superwise

Evaluation · Multi-model

Agentic management platform for runtime guardrails, policy enforcement, and observability across LLM agents.

TruLens

Evaluation · Multi-model (LLM-as-judge)

Open-source evaluation and tracing framework for LLM apps and agents, built on OpenTelemetry.

W&B Weave

Evaluation · Multi-model

Production observability, tracing, and evaluation for LLM and agent systems from the Weights & Biases stack.