Evaluation
Observability, prompt testing, and quality scoring.
7 tools
Braintrust
FeaturedEvaluation
8.9
Eval, monitor, and improve AI products end-to-end.
Freemium· Free up to 1k events/day; team from $249/moevalsmonitoring
LangSmith
Evaluation
8.7
LangChain's eval + observability platform.
Freemium· Free starter; Plus $39/mo per seatLLM tracingevals
Weights & Biases
Evaluation
8.4
The ML experiment tracker, now with LLM eval features.
Freemium· Free personal; team from $50/moML experimentsLLM eval
Helicone
Evaluation
8.3
Open-source LLM observability — one-line proxy install.
Freemium· Free 100k requests/mo; from $25/moobservabilitycost tracking
Humanloop
Evaluation
8.2
Prompt management + evals for collaborative AI teams.
Paid· From $200/mo teamprompt managementteam collab
PromptLayer
Evaluation
7.9
Lightweight prompt logging + management for OpenAI/Claude apps.
Freemium· Free; Pro from $50/moprompt loggingversioning
Patronus
Evaluation
7.8
Automated LLM evaluation for hallucinations, safety, and quality.
Paid· Enterprise pricinghallucination detectionsafety