kitio.aiOpik vs Lunary
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Opik has the lower starting price: about $19 a month, against $20 for Lunary.
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
- LLM request logging
- Chatbot analytics
- Prompt versioning
- Human reviews
- AI playground
- CSV and JSONL export
| Feature | Opik | Lunary |
|---|---|---|
| Best for | Comet's open-source platform for LLM tracing and evaluation | Observability, prompt management and evals for LLM apps |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | $19/mo | $20/mo |
| Free plan | Yes | Yes |
| Made by | Comet | Lunary |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
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Pricing compared
Opik has the lower starting price: about $19 a month, against $20 for Lunary.
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
2 plans
Team
$20/mo
- Per user
- 50,000 events per month
- 300 playground queries per month
- Unlimited projects, 1 year history
Enterprise
Custom
- Custom limits
- Plans for larger teams
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
Lunary
- Prompts and traces in one tool
- Self-hosting option
- Clear per-seat pricing
- Cloud workspace requires payment up front
- Team plan caps at 10 seats
- Extra events and queries cost more
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 Lunary if you want:
- Prompts and traces in one tool
- Self-hosting option
- Clear per-seat pricing
Watch out: cloud workspace requires payment up front.
Opik vs Lunary FAQ
What is the difference between Opik and Lunary?
Opik: Comet's open-source platform for LLM tracing and evaluation. Lunary: Observability, prompt management and evals for LLM apps. Both are models & apis tools.
Is Opik or Lunary cheaper?
Opik has the lower starting price: about $19 a month, against $20 for Lunary.
Do Opik and Lunary have free plans?
Opik: Yes. Lunary: Yes.
Who makes Opik?
Opik is made by Comet, based in United States.
Who makes Lunary?
Lunary is made by Lunary.
Which should I choose, Opik or Lunary?
Choose Opik if you value free and self-hostable and automatic prompt optimization. Choose Lunary if you value prompts and traces in one tool and self-hosting option.