kitio.aiOpik vs Promptfoo
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Opik starts at $19/mo and Promptfoo starts at See pricing page. Check both pricing pages for current plans.
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
- Config-based test cases
- Model comparison
- Red-team scans
- CI integration
- Web results viewer
| Feature | Opik | Promptfoo |
|---|---|---|
| Best for | Comet's open-source platform for LLM tracing and evaluation | Open-source CLI for testing prompts and red-teaming AI apps |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | $19/mo | See pricing page |
| Free plan | Yes | Yes |
| Made by | Comet | OpenAI |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
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Pricing compared
Opik starts at $19/mo and Promptfoo starts at See pricing page. Check both pricing pages for current plans.
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
Community
Free
- Open source
- All LLM evaluation features
- Red teaming (10k probes/month)
- Run locally or self-host
Enterprise
Contact sales
- Reports and continuous monitoring
- Issue tracking and remediation
- Dedicated runner
- Assigned deployment engineer
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
Promptfoo
- Free and works with any provider
- Strong security testing
- Fits developer workflows
- Owned by a model vendor now
- CLI-first may not suit everyone
- Enterprise pricing not public
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 Promptfoo if you want:
- Free and works with any provider
- Strong security testing
- Fits developer workflows
Watch out: owned by a model vendor now.
Opik vs Promptfoo FAQ
What is the difference between Opik and Promptfoo?
Opik: Comet's open-source platform for LLM tracing and evaluation. Promptfoo: Open-source CLI for testing prompts and red-teaming AI apps. Both are models & apis tools.
Is Opik or Promptfoo cheaper?
Opik starts at $19/mo and Promptfoo starts at See pricing page. Check both pricing pages for current plans.
Do Opik and Promptfoo have free plans?
Opik: Yes. Promptfoo: Yes.
Who makes Opik?
Opik is made by Comet, based in United States.
Who makes Promptfoo?
Promptfoo is made by OpenAI, based in United States.
Which should I choose, Opik or Promptfoo?
Choose Opik if you value free and self-hostable and automatic prompt optimization. Choose Promptfoo if you value free and works with any provider and strong security testing.