TruLens

Evals and tracing for AI agents

About TruLens

TruLens is an open-source, OpenTelemetry-native library for evaluating and tracing AI agents, RAG pipelines and MCP applications. It records latency, inputs, outputs, tokens and cost for every step, then scores each step with benchmarked LLM judges covering groundedness, context relevance, tool selection, plan adherence and safety. Teams can compare versions on leaderboards, customize judges to their domain, and instrument applications in Python without changing their existing stack.

TruLens website preview

Live preview of trulens.org via the WordPress mShots service — it can take a few seconds to generate on a first visit.

TruLens: strengths & things to check

Strengths

Completely free to use — this directory lists no paid plan for it.
Covers llm evaluation, agent tracing, open source, opentelemetry — see the focus areas listed in its key facts.
Has 6 close alternatives in the same category on this page, so switching or comparing is easy.

Things to check

Free tools can change their model or shut down — avoid locking critical work into it without an export path.
Current plan prices are not listed here (they change too often to print reliably) — confirm the exact price on the official site.
It is one of 1164 tools in the Developer Tools category here — compare it against the alternatives below before you commit.

Derived from this listing's own data (pricing model, focus areas and category) — not a hands-on review score.

TruLens pricing

Pricing model	Free — listed in this directory as a free tool, with no paid plan required to use it.
Free access	Yes — fully free
Current plan prices	Listed on the official site — prices change, so this directory links out instead of printing a number that may already be stale.
Official site	trulens.org

TruLens key facts

Category: Developer Tools
Pricing: Free — listed in this directory as a free tool, with no paid plan required to use it.
Focus areas: llm evaluation, agent tracing, open source, opentelemetry
Official site: trulens.org

TruLens FAQ

How much does TruLens cost?

Free — listed in this directory as a free tool, with no paid plan required to use it. Current plans and prices are listed on the official site (trulens.org).

What is TruLens used for?

Evals and tracing for AI agents Its focus areas in the Developer Tools category: llm evaluation, agent tracing, open source, opentelemetry.

Where can I try TruLens?

On its official site, trulens.org — the Visit Official Site button above goes straight there.

TruLens vs alternatives

	TruLens	Ansible	Anubis	AnyCable
Pricing	Free — listed in this directory as a free tool, with no paid plan required to use it.	Freemium — a free tier lets you start, and paid plans are available if you need more.	Free — listed in this directory as a free tool, with no paid plan required to use it.	Freemium — a free tier lets you start, and paid plans are available if you need more.
Focus areas	llm evaluation, agent tracing, open source, opentelemetry	automation, configuration management, devops, open source	bot protection, security, self hosted, open source	websockets, realtime, rails, open source, infrastructure
Official site	trulens.org	ansible.com	anubis.techaro.lol	anycable.io
Directory status	Listed	Listed	Listed	Listed

Side-by-side from each listing's own directory data. Full alternative cards are below.

About the Developer Tools category

Editors, platforms, and services developers rely on to build and ship software. The Developer Tools category on Tools Hub currently lists 1164 tools. Alongside TruLens, it includes TwelveLabs, ZZZ Code AI, Confident AI, Documentation.AI.

FreeDeveloper Toolsllm-evaluationagent-tracingopen-sourceopentelemetry

Alternatives to TruLens

Tools in the same Developer Tools category that share focus areas with TruLens — worth comparing before you commit:

Developer Tools

Ansible

Simple open-source IT automation engine

Freemiumautomationconfiguration-managementdevopsopen-source

Developer Tools

Anubis

Web AI firewall that protects sites from scraper bots

Freebot-protectionsecurityself-hostedopen-source

Developer Tools

AnyCable

Realtime server with delivery guarantees for any backend

Freemiumwebsocketsrealtimerailsopen-source

Developer Tools

Apache HTTP Server

A fast, reliable and extensible open-source web server for modern systems.

Freeweb-serverapachehostingopen-source

Developer Tools

Apache JMeter

Load testing and performance measurement for services

Freeload-testingperformanceopen-source

Developer Tools

Apache NetBeans

Full IDE for Java and more, from Apache

Freeidejavaopen-source

More in Developer Tools

Comparing tools in the Developer Tools category? These related listings are worth a look: TwelveLabs — Video intelligence platform and API; ZZZ Code AI — Free online AI tools for coding and programming; Confident AI — LLM evaluation and observability platform behind the DeepEval framework.