LangFast alternatives

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.

Weights & Biases

Evaluation · Platform (any LLM)

8.4

The ML experiment tracker, now with LLM eval features.

Helicone

Evaluation · Platform (any LLM)

8.3

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

Arize AI

Evaluation · Multi-model

8.2

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

Giskard

Evaluation · Multi-model

8.2

Continuous AI red teaming platform that stress-tests LLM agents for vulnerabilities before they hit production.

Great Expectations

Evaluation

8.2

Open-source data quality framework for validating the datasets that feed your ML and analytics pipelines.

Humanloop

Evaluation · Platform (any LLM)

8.2

Prompt management + evals for collaborative AI teams.

LiveBench

Evaluation · Multi-model

8.2

Contamination-free LLM benchmark that refreshes its questions monthly to keep frontier models honest.

Athina AI

Evaluation · Multi-model

8.1

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

Berkeley Function-Calling Leaderboard

Evaluation · Multi-model

8.1

Open benchmark from UC Berkeley that ranks LLMs on real-world tool-use and function-calling accuracy.

HoneyHive

Evaluation · Multi-model

8.1

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