Best LLM Observability & Eval Tools
Shipping an LLM feature without evals is shipping blind: outputs drift, costs creep, and regressions are invisible until a customer finds them. These log every call, score outputs against test sets, and turn prompt changes into something you can measure.
- 1LangSmithFreemium
The natural pick if you already use LangChain — traces every chain step without extra wiring.
Observability and evals for LangChain apps.
- 2HeliconeFreemium
One line of proxy config gets you logs, cost tracking, and caching across providers.
Logs, costs, and caching for LLM apps in one platform.
- 3BraintrustFreemium
Eval-first: build test sets, score model output, and compare prompt versions like code changes.
Evals and observability platform for AI engineers.
- 4PromptLayerFreemium
Lets non-engineers edit and A/B prompts without a deploy.
Prompt management and A/B testing for LLM apps.
- 5HumanloopFreemium
Prompt management and evals for product teams shipping LLMs.
- 6PromptwatchFreemium
Debug, trace, and optimize your LLM applications with full visibility.
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