kitio.aiWeights & Biases vs Arthur
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Weights & Biases starts at $60/mo and Arthur starts at $60/mo. 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
- Experiment tracking
- Hyperparameter sweeps
- Model registry
- Weave LLM tracing
- Reports
- Agent discovery
- Step-level tracing
- Runtime guardrails
- Audit logs and lineage
- Custom metrics and alerts
| Feature | Weights & Biases | Arthur |
|---|---|---|
| Best for | Experiment tracking and LLM observability, now part of CoreWeave | Discovery, monitoring and governance for enterprise AI agents |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | $60/mo | $60/mo |
| Free plan | Yes | Yes |
| Made by | CoreWeave | Arthur AI |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Weights & Biases starts at $60/mo and Arthur starts at $60/mo. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Free
Free
- Experiment tracking for individuals
- Limited storage
Pro
$60/mo
- Starting price
- Team collaboration features
- Higher usage limits
Enterprise
Contact sales
- SSO and advanced security
- Dedicated support
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
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
Weights & Biases
- Industry-standard experiment tracking
- Polished dashboards
- Covers training and LLM apps
- Pricing jumps for larger teams
- Weave ingestion billed by size
- Sign-in moved to CoreWeave
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
Which one should you choose?
Choose Weights & Biases if you want:
- Industry-standard experiment tracking
- Polished dashboards
- Covers training and LLM apps
Watch out: pricing jumps for larger teams.
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.
Weights & Biases vs Arthur FAQ
What is the difference between Weights & Biases and Arthur?
Weights & Biases: Experiment tracking and LLM observability, now part of CoreWeave. Arthur: Discovery, monitoring and governance for enterprise AI agents. Both are models & apis tools.
Is Weights & Biases or Arthur cheaper?
Weights & Biases starts at $60/mo and Arthur starts at $60/mo. Check both pricing pages for current plans.
Do Weights & Biases and Arthur have free plans?
Weights & Biases: Yes. Arthur: Yes.
Who makes Weights & Biases?
Weights & Biases is made by CoreWeave, based in United States.
Who makes Arthur?
Arthur is made by Arthur AI, based in United States.
Which should I choose, Weights & Biases or Arthur?
Choose Weights & Biases if you value industry-standard experiment tracking and polished dashboards. Choose Arthur if you value finds shadow agents across environments and free tier with unlimited seats.