kitio.aiTruLens vs Evidently AI
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. TruLens is completely free, while Evidently AI is freemium.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- OpenTelemetry tracing
- LLM judge evaluations
- RAG triad metrics
- Custom rubrics
- Multi-turn conversation evals
- Built-in metric presets
- Data drift detection
- LLM-as-judge evals
- Interactive reports
- Cloud dashboards
| Feature | TruLens | Evidently AI |
|---|---|---|
| Best for | Open-source evals and OpenTelemetry tracing for AI agents and RAG | Open-source evaluation and monitoring for ML models and LLM apps |
| Category | Models & APIs | Models & APIs |
| Pricing model | Free | Freemium |
| Starting price | Free | See pricing page |
| Free plan | Yes, fully free | Yes |
| Made by | Snowflake | Evidently AI |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
TruLens is completely free, while Evidently AI is freemium.
Free plan
Cheapest paid plan
Top plan
Free trial
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
TruLens
- Free and open source
- Judges explain each score
- Standard OpenTelemetry traces
- Python library, not a hosted product
- Judge scoring adds LLM costs
- Custom metrics require writing code
Evidently AI
- Covers classic ML and LLMs
- Free open-source core
- Many ready-made tests
- Python-only library
- Cloud needed for team features
- Less agent tracing depth
Which one should you choose?
Choose TruLens if you want:
- Free and open source
- Judges explain each score
- Standard OpenTelemetry traces
Watch out: python library, not a hosted product.
Choose Evidently AI if you want:
- Covers classic ML and LLMs
- Free open-source core
- Many ready-made tests
Watch out: python-only library.
TruLens vs Evidently AI FAQ
What is the difference between TruLens and Evidently AI?
TruLens: Open-source evals and OpenTelemetry tracing for AI agents and RAG. Evidently AI: Open-source evaluation and monitoring for ML models and LLM apps. Both are models & apis tools.
Is TruLens or Evidently AI cheaper?
TruLens is completely free, while Evidently AI is freemium.
Do TruLens and Evidently AI have free plans?
TruLens: Yes, fully free. Evidently AI: Yes.
Who makes TruLens?
TruLens is made by Snowflake, based in United States.
Who makes Evidently AI?
Evidently AI is made by Evidently AI.
Which should I choose, TruLens or Evidently AI?
Choose TruLens if you value free and open source and judges explain each score. Choose Evidently AI if you value covers classic ml and llms and free open-source core.