kitio.aiOpik vs Ragas
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Ragas 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
- RAG quality metrics
- Agent evaluation
- Synthetic test generation
- Framework integrations
- CI-friendly runs
| Feature | Opik | Ragas |
|---|---|---|
| Best for | Comet's open-source platform for LLM tracing and evaluation | Open-source metrics and test data for evaluating RAG and agents |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Free |
| Starting price | $19/mo | Free |
| Free plan | Yes | Yes, fully free |
| Made by | Comet | Vibrant Labs |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
|
Both offer: Framework integrations.
Pricing compared
Ragas 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
Ragas
- Free and widely used
- Research-backed metrics
- Generates test data
- LLM-judge metrics cost tokens
- API changes between versions
- No hosted dashboard included
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 Ragas if you want:
- Free and widely used
- Research-backed metrics
- Generates test data
Watch out: llm-judge metrics cost tokens.
Opik vs Ragas FAQ
What is the difference between Opik and Ragas?
Opik: Comet's open-source platform for LLM tracing and evaluation. Ragas: Open-source metrics and test data for evaluating RAG and agents. Both are models & apis tools.
Is Opik or Ragas cheaper?
Ragas is completely free, while Opik is freemium.
Do Opik and Ragas have free plans?
Opik: Yes. Ragas: Yes, fully free.
Who makes Opik?
Opik is made by Comet, based in United States.
Who makes Ragas?
Ragas is made by Vibrant Labs.
Which should I choose, Opik or Ragas?
Choose Opik if you value free and self-hostable and automatic prompt optimization. Choose Ragas if you value free and widely used and research-backed metrics.