kitio.aiArthur vs Braintrust
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Arthur has the lower starting price: about $60 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
- Agent discovery
- Step-level tracing
- Runtime guardrails
- Audit logs and lineage
- Custom metrics and alerts
- Code and UI evals
- Experiment comparison
- CI eval gating
- Production logging
- Prompt playground
| Feature | Arthur | Braintrust |
|---|---|---|
| Best for | Discovery, monitoring and governance for enterprise AI agents | Evaluation and observability platform for shipping reliable AI apps |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | $60/mo | $249/mo |
| Free plan | Yes | Yes |
| Made by | Arthur AI | Braintrust |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
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Pricing compared
Arthur has the lower starting price: about $60 a month, against $249 for Braintrust.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Free
Free
- Up to 4 monitored use cases
- Unlimited seats
- Cloud data connectors
Premium
$60/mo
- Up to 100 use cases
- Custom metrics and dashboards
- Custom alerts and webhooks
Enterprise
Contact sales
- Dedicated infrastructure
- Governance and support
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
Arthur
- Finds shadow agents across environments
- Free tier with unlimited seats
- Covers security and evaluation together
- Free tier monitors only 4 use cases
- Enterprise features need a sales call
- Broad platform takes time to set up
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 Arthur if you want:
- Finds shadow agents across environments
- Free tier with unlimited seats
- Covers security and evaluation together
Watch out: free tier monitors only 4 use cases.
Choose Braintrust if you want:
- Strong eval workflow
- Good for product teams
- Hybrid data option
Watch out: pro plan is expensive.
Arthur vs Braintrust FAQ
What is the difference between Arthur and Braintrust?
Arthur: Discovery, monitoring and governance for enterprise AI agents. Braintrust: Evaluation and observability platform for shipping reliable AI apps. Both are models & apis tools.
Is Arthur or Braintrust cheaper?
Arthur has the lower starting price: about $60 a month, against $249 for Braintrust.
Do Arthur and Braintrust have free plans?
Arthur: Yes. Braintrust: Yes.
Who makes Arthur?
Arthur is made by Arthur AI, based in United States.
Who makes Braintrust?
Braintrust is made by Braintrust, based in United States.
Which should I choose, Arthur or Braintrust?
Choose Arthur if you value finds shadow agents across environments and free tier with unlimited seats. Choose Braintrust if you value strong eval workflow and good for product teams.