ModelRefs / TruLens — AI Glossary
TruLens — AI Glossary
An open-source evaluation and observability framework for LLM applications, supporting RAG triads and custom feedback functions.
Overview
TruLens (TruEra) records LLM app inputs, outputs, and intermediate steps; evaluates them using 'feedback functions' (LLM-based or heuristic). Supports the RAG triad (groundedness, answer relevance, context relevance). Integrates with LlamaIndex, LangChain, and custom apps. Dashboard for tracking quality across app versions.
Reference details
| Topic | evaluation |
|---|---|
| Last reviewed | 2026-06-24 |
Related terms
Commonly confused with
An evaluation framework rather than a hosted platform, which is the distinction that matters against Langfuse, Braintrust or Phoenix: it gives you feedback functions to score RAG behaviour in code, not a service to send traces to. Its RAG triad — context relevance, groundedness, answer relevance — is the same decomposition RAGAS uses under different names.
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Frequently asked questions
What is TruLens?
An open-source evaluation and observability framework for LLM applications, supporting RAG triads and custom feedback functions.
What concepts are related to TruLens?
Closely related concepts include ragas, langsmith, langfuse.