#1
L#1
Open-source LLM observability, tracing and evals.
Evals & observabilityopen-source
#1 in Best agent tracing & evals · Score: not yet benchmarked
Best Evals & observability AI Tools
These are the best evals & observability AI tools for builders, ordered by their positions in StackRank's task rankings. Langfuse leads right now. Each listing shows its pricing model, category and last-verified date, and payments never change the order. Filter by pricing, or read how we rank.
Updated Oct 14, 2026 · How we rank
Ranked, not sold.
3 tools
- #2L
Tracing, evaluation and monitoring for LLM apps.
Evals & observabilityfreemium#2 in Best agent tracing & evals · Score: not yet benchmarked - #3H
Open-source LLM observability and gateway.
Evals & observabilityopen-source#3 in Best agent tracing & evals · Score: not yet benchmarked
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Task rankings in Evals & observability
FAQ
What is the best evals & observability AI tool?
By our method, Langfuse currently leads evals & observability, followed by LangSmith and Helicone.
Can a company pay for a higher rank?
No. Sponsored placements are labeled "Sponsored", never numbered, and never change ranking order.