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TruLens

Free

Evaluation and tracking for LLM apps — feedback functions and experiment logging.

Open SourceCloudPython SDK

Tool Info

Categories
Evaluation · Observability
Developer
TruEra
License
Open Source
Official Website
www.trulens.org
Repository
truera/trulens
Official Docs

Overview

TruLens instruments LLM applications to collect traces and run feedback-based evaluations.

It helps teams define what "good" means and measure it across runs.

Backed by TruEra for enterprise model intelligence.

Features

  • Feedback functions
  • App instrumentation
  • Leaderboards
  • TruEra platform integration

Pricing

Free tier available
Free (open source)

Pros

  • Combines tracing and evaluation
  • Framework integrations
  • Grounded feedback design

Best For

LLM app tracing + evalFeedback function developmentExperiment comparison

When NOT to Use

  • TruEra platform for advanced features
  • Smaller community than LangFuse

Typical Users

ML engineersLLM app developers

Related Tools

Promptfoo
CLI tool for testing and evaluating LLM outputs with red-teaming support.
DeepEval
Open-source LLM evaluation framework with 50+ metrics and CI integration.
RAGAS
Reference-free evaluation framework specifically for RAG pipelines.

Alternatives

LangFuse
Open-source LLM engineering platform for tracing, evals, and analytics.
Phoenix
Open-source observability for LLMs, embeddings, and retrieval.
DeepEval
Open-source LLM evaluation framework with 50+ metrics and CI integration.

Tags

#evaluation#observability#llm

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