TruLens
A library for tracking and evaluating LLM applications to identify failure points and cost-saving opportunities.
- Also known as
- trulens
What is TruLens?
An open-source library for systematically evaluating and tracing LLM-based applications, providing feedback functions and metrics to assess quality, safety, and relevance.
TruLens pricing
We don't have TruLens's full plan breakdown yet (its pricing page resisted automated reading). Here's what we could confirm. Always check live pricing for exact numbers.
What TruLens does
The capabilities that matter for ai evals testing, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- Architecture model
- Open source CLI
- LLM as a judge prompt grading framework
- ✓
- Specialized rag metrics faithfulness context relevance
- ✓
- Deterministic regex and json schema assertions
- -
- Synthetic test dataset generation from documents
- -
- Ci cd github actions pipeline blocking gates
- -
- Red teaming and adversarial vulnerability scanning
- ✓
- Multi model side by side ab regression testing
- ✓
- Human in the loop hitl annotation UI
- -
- Dashboard analytics for metric drift over time
- ✓
- SOC2 type ii
- -
- Mit or apache permissive oss license
- -
- Pricing model
- Free open source
Platform & deployment
Independently observed- CLI
- Web
- Self-hosted
Integrations (10)
Independently observed- Anthropic→
- Cohere→
- Mistral→
- LiteLLM•
- Jaeger→
- Grafana Tempo→
- Datadog→
- New Relic→
- OpenAI
- GEPA
Security & compliance
Known vulnerabilities: 0 (0 in the last 12 months) sourcea count reflects scale & disclosure, not quality
TruLens FAQ
Common questions about TruLens, answered from independent, dated evidence.
What is TruLens?
An open-source library for systematically evaluating and tracing LLM-based applications, providing feedback functions and metrics to assess quality, safety, and relevance. It is indexed under AI Evals Testing.
Source: https://www.trulens.org
Is TruLens free to use?
TruLens is open source, so it can be self-hosted and used at no licence cost. It is released under the MIT licence. Pricing changes often, so verify at source before relying on it.
Source: https://www.trulens.org
What platforms does TruLens support?
TruLens supports the web and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.
Source: https://www.trulens.org
Can TruLens be self-hosted?
Yes. TruLens can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.
Source: https://www.trulens.org
Is TruLens open source?
Yes. TruLens is published under the MIT licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.
TruLens alternatives
Other ai evals testing we track, ranked by the same independent score.
- Patronus AIAutomated evaluation and monitoring platform for testing and optimizing language models and AI agentslow · 30%
- LM Evaluation HarnessAn open-source framework for evaluating and benchmarking language modelslow · 35%
- GalileoAI evaluation and observability platform for testing, monitoring, and improving AI systemslow · 7%
- OpenAI EvalsFramework for evaluating and benchmarking large language models and LLM-based systemslow · 22%
Compare TruLens
Side by side against other ai evals testing, attribute by attribute, with a source on every value.
The vioscaleAI score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for TruLens, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Development activity | 60 | 0.12 | 7.2 | ✓ |
| Capabilities | 75 | 0.08 | 6.2 | ✓ |
| Release cadence | 92 | 0.07 | 6.2 | ✓ |
| Stars | 67 | 0.03 | 2.2 | ✓ |
| Integrations | 27 | 0.05 | 1.5 | ✓ |
| Dependent projects | 5 | 0.08 | 0.4 | ✓ |
| Security posture | 0 | 0.09 | 0.0 | - |
| Package downloads | 0 | 0.17 | 0.0 | - |
| Security score | 0 | 0.05 | 0.0 | - |
| Developer Q&A activity | 0 | 0.08 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Activity
| Attribute | Value | Evidence |
|---|---|---|
| Commits last 30d | 78 | mediumsource · 2026-10-14 · 65% |
Adoption
Content
| Attribute | Value | Evidence |
|---|---|---|
| Faq | 5 items | mediumsource · 2026-09-10 · 67% |
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | Pricing model: free_open_source · Architecture model: open_source_cli · Llm as a judge prompt grading framework: Yes · Dashboard analytics for metric drift over time: Yes · Multi model side by side ab regression testing: Yes · Red teaming and adversarial vulnerability scanning: Yes | mediumsource · 2026-10-14 · 60% |
Integrations
| Attribute | Value | Evidence |
|---|---|---|
| Count | 8 | mediumsource · 2026-10-14 · 60% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | Python | highsource · 2026-10-14 · 90% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | MIT | highsource · 2026-10-14 · 95% |
Pricing
Release
Reliability
| Attribute | Value | Evidence |
|---|---|---|
| Status page | Yes | mediumsource · 2026-08-21 · 60% |
Security
| Attribute | Value | Evidence |
|---|---|---|
| Vulnerabilities | Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=trulens-eval&per_page=100 · Last 12m: 0 | highsource · 2026-10-14 · 90% |
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