kitio.aiOpik vs TruLens
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. TruLens is completely free, while Opik is freemium.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Tracing and spans
- Evaluation metrics
- Agent optimizer
- Guardrails
- Framework integrations
- OpenTelemetry tracing
- LLM judge evaluations
- RAG triad metrics
- Custom rubrics
- Multi-turn conversation evals
| Feature | Opik | TruLens |
|---|---|---|
| Best for | Comet's open-source platform for LLM tracing and evaluation | Open-source evals and OpenTelemetry tracing for AI agents and RAG |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Free |
| Starting price | $19/mo | Free |
| Free plan | Yes | Yes, fully free |
| Made by | Comet | Snowflake |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
|
Pricing compared
TruLens is completely free, while Opik is freemium.
Free plan
Cheapest paid plan
Top plan
Free trial
4 plans
Open Source
Free
- Self-hosted
- Full observability feature set
- Unlimited spans
Free Cloud
Free
- Up to 10 team members
- 25k spans per month
- 60-day data retention
Pro Cloud
$19/mo
- Up to 50 team members
- 100k spans per month
- $5 per extra 100k spans
Enterprise
Custom
- Unlimited team members
- Flexible deployments
- Single sign-on
- 2-hour response SLA
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
Opik
- Free and self-hostable
- Automatic prompt optimization
- Many integrations
- Smaller community than Langfuse
- Hosted plan limits vary
- Docs split with Comet ML
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
Which one should you choose?
Choose Opik if you want:
- Free and self-hostable
- Automatic prompt optimization
- Many integrations
Watch out: smaller community than langfuse.
Choose TruLens if you want:
- Free and open source
- Judges explain each score
- Standard OpenTelemetry traces
Watch out: python library, not a hosted product.
Opik vs TruLens FAQ
What is the difference between Opik and TruLens?
Opik: Comet's open-source platform for LLM tracing and evaluation. TruLens: Open-source evals and OpenTelemetry tracing for AI agents and RAG. Both are models & apis tools.
Is Opik or TruLens cheaper?
TruLens is completely free, while Opik is freemium.
Do Opik and TruLens have free plans?
Opik: Yes. TruLens: Yes, fully free.
Who makes Opik?
Opik is made by Comet, based in United States.
Who makes TruLens?
TruLens is made by Snowflake, based in United States.
Which should I choose, Opik or TruLens?
Choose Opik if you value free and self-hostable and automatic prompt optimization. Choose TruLens if you value free and open source and judges explain each score.