kitio.aiOpik vs Braintrust
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 $249 for Braintrust.
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
- Code and UI evals
- Experiment comparison
- CI eval gating
- Production logging
- Prompt playground
| Feature | Opik | Braintrust |
|---|---|---|
| Best for | Comet's open-source platform for LLM tracing and evaluation | Evaluation and observability platform for shipping reliable AI apps |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | $19/mo | $249/mo |
| Free plan | Yes | Yes |
| Made by | Comet | Braintrust |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
|
Pricing compared
Opik has the lower starting price: about $19 a month, against $249 for Braintrust.
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
3 plans
Starter
Free
- $10 model credits/month
- 1 GB processed data
- 10k scores
- 14-day retention
Pro
$249/mo
- $100 model credits/month
- 5 GB processed data
- 50k scores
- 30-day retention, RBAC
Enterprise
Custom
- Custom retention and export
- On-prem or hosted deployment
- Premium support
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
Braintrust
- Strong eval workflow
- Good for product teams
- Hybrid data option
- Pro plan is expensive
- Not open source
- Overkill for hobby projects
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 Braintrust if you want:
- Strong eval workflow
- Good for product teams
- Hybrid data option
Watch out: pro plan is expensive.
Opik vs Braintrust FAQ
What is the difference between Opik and Braintrust?
Opik: Comet's open-source platform for LLM tracing and evaluation. Braintrust: Evaluation and observability platform for shipping reliable AI apps. Both are models & apis tools.
Is Opik or Braintrust cheaper?
Opik has the lower starting price: about $19 a month, against $249 for Braintrust.
Do Opik and Braintrust have free plans?
Opik: Yes. Braintrust: Yes.
Who makes Opik?
Opik is made by Comet, based in United States.
Who makes Braintrust?
Braintrust is made by Braintrust, based in United States.
Which should I choose, Opik or Braintrust?
Choose Opik if you value free and self-hostable and automatic prompt optimization. Choose Braintrust if you value strong eval workflow and good for product teams.