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📖 The AI Tool Bible

Opik vs TruLens

A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.

Opik logo
Opik
Evaluation
TruLens logo
TruLens
Evaluation
Tagline
Opik
Open-source LLM observability and evaluation platform for debugging and monitoring AI agents in production.
TruLens
Open-source evaluation and tracing framework for LLM apps and agents, built on OpenTelemetry.
Pricing
Opik
Freemium· Free open-source self-host; free Cloud tier (no card); Enterprise contact sales
TruLens
Free· Free, open source (Apache-licensed Python package)
Free trial
Opik
Yes
TruLens
Yes
API
Opik
Yes
TruLens
Yes
Platforms
Opik
api
TruLens
apicliweb
Open source
Opik
Yes · Apache-2.0
TruLens
Yes · MIT
GitHub stars
Opik
22,290
checked 2026-09-29
TruLens
3,579
checked 2026-09-29
Last GitHub push
Opik
2026-09-29
TruLens
2026-09-29
First commit
Opik
2023-05
TruLens
2020-11
Company
Opik
Comet
TruLens
TruEra
Model used
Opik
Multi-model
TruLens
Multi-model (LLM-as-judge)
Best for
Opik
Pick Opik if you're shipping LLM agents and want open-source tracing, evals, and guardrails you can self-host or run on Comet's free cloud.
TruLens
Pick TruLens if you want a code-first, open-source way to trace and score LLM apps or agents without sending eval data to a hosted vendor.
Not for
Opik
Skip it if you only need lightweight prompt logging or you've already standardized on LangSmith/Langfuse and don't want a migration.
TruLens
Skip it if you need a turnkey managed eval SaaS with a hosted UI, non-Python SDKs, or zero infra work.
Editorial score
Opik
7.3 / 10
TruLens
8.1 / 10
Use cases
Opik
llm-tracingagent-evaluationprompt-testingproduction-monitoringguardrailscost-tracking
TruLens
llm-evaluationrag-evaluationagent-tracingregression-testingobservability
Pros
Opik
  • Fully open-source with permissive self-hosting
  • 30+ built-in LLM-as-a-Judge evaluation metrics
  • Broad SDK and framework integrations (LangChain, LlamaIndex, LiteLLM, CrewAI)
  • Production guardrails plus PII protection out of the box
  • Free Cloud tier with no credit card required
TruLens
  • Free and open source, no vendor lock-in on eval data
  • OpenTelemetry-native tracing plugs into existing observability stacks
  • Broad library of benchmarked feedback functions plus custom metrics
  • Framework-agnostic: works with LangChain, LlamaIndex, or raw SDK calls
  • Backed by Snowflake with active maintenance
Cons
Opik
  • Feature surface area is wide; non-trivial onboarding
  • Self-hosting at scale still requires real infra work
  • Ollie auto-fix agent is newer and less battle-tested
  • Cost dashboard is most useful if you're already on Claude Code
TruLens
  • Self-hosted library, no managed dashboard or hosted storage
  • LLM-as-judge metrics rack up model API costs you pay separately
  • Python-only SDK, no first-party JS/TS client
Website
Opik
comet.com
TruLens
www.trulens.org

Editorial score: rule-based, 0–10, from AI-assisted profile inputs (see /methodology) — not a user rating; “—” means unscored. “Not listed” means we have no record of it, not that it is absent. GitHub figures and prices carry the date they were checked or captured; prices are shown as published, unconverted.

Pick Opik if
  • ✅ Fully open-source with permissive self-hosting
  • ✅ 30+ built-in LLM-as-a-Judge evaluation metrics
  • ✅ Broad SDK and framework integrations (LangChain, LlamaIndex, LiteLLM, CrewAI)
  • ✅ Production guardrails plus PII protection out of the box
Pick TruLens if
  • ✅ Free and open source, no vendor lock-in on eval data
  • ✅ OpenTelemetry-native tracing plugs into existing observability stacks
  • ✅ Broad library of benchmarked feedback functions plus custom metrics
  • ✅ Framework-agnostic: works with LangChain, LlamaIndex, or raw SDK calls
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