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TruLens
TruLens is an evaluation and tracing tool that instruments AI agents, scores steps with LLM judges, and compares versions.
TruLens is an open source evaluation and tracing tool for AI agents and applications. It instruments your agent with OpenTelemetry to record latency, inputs, outputs, tokens, and cost per step. It scores steps using benchmarked LLM judges that explain their reasoning, helping you find failures and optimize costs. You can use out of the box judges or tune them with your private data and rubrics. It evaluates agents, RAG, MCP apps, and summarization, supporting custom Python functions and LLM prompts. TruLens integrates with frameworks like LangChain, LangGraph, and LlamaIndex, and is maintained by Snowflake.
TruLens at a glance
- Best for: Software engineer
- Runs on: open source, API
- Pricing: Free
- Released: November 2020
- Category: AI coding tool
- Website: trulens.org
Key features
- Instrument AI agents with OpenTelemetry
- Score every step with LLM judges
- Record latency, inputs, outputs, tokens, and cost
- Evaluate RAG, agents, MCP apps, and summarization
- Tune judges with private data and rubrics
- Compare versions and view leaderboards
- Support custom Python functions and prompts
Use it for
- Trace agent steps and find failure causes
- Evaluate RAG groundedness and relevance
- Compare app versions and ship improvements
- Test tool selection and plan adherence in agents
Alternatives to TruLens
- Tracely — Turns production failures into regression tests that block pull requests.
- OpenLIT — It enables comprehensive monitoring, evaluation, and management of AI agents via OpenTelemetry.
- OpenCode — Works with 75+ model providers, local models, and existing subscriptions
- TRAE — It features an autonomous coding agent that drives the entire development process.
- Velu — Evaluates documentation across 23 checks and 7 categories in seconds without a signup.
- pstack — Improves AI coding agent outcomes with rigorous workflows.
- VoltAgent — Offers open-source flexibility with built-in supervisor agent orchestration and RAG.
- jevgrep — Reduces coding agent costs by providing targeted, relevant repository context.
- TraceRoot — Closes the self-improving loop for coding agents using production traces and evals.
- Laminar — It automatically detects agent failure patterns without manual definitions.
- Crit — It keeps human feedback localized and precise for AI agent code iterations.
- OpenClaude — Connects one terminal interface to over 200 different AI models.
All TruLens alternatives