kitio.aiWeights & Biases vs Braintrust
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Weights & Biases 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
- Experiment tracking
- Hyperparameter sweeps
- Model registry
- Weave LLM tracing
- Reports
- Code and UI evals
- Experiment comparison
- CI eval gating
- Production logging
- Prompt playground
| Feature | Weights & Biases | Braintrust |
|---|---|---|
| Best for | Experiment tracking and LLM observability, now part of CoreWeave | 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 | CoreWeave | Braintrust |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
|
Pricing compared
Weights & Biases 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
- 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
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
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
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 Weights & Biases if you want:
- Industry-standard experiment tracking
- Polished dashboards
- Covers training and LLM apps
Watch out: pricing jumps for larger teams.
Choose Braintrust if you want:
- Strong eval workflow
- Good for product teams
- Hybrid data option
Watch out: pro plan is expensive.
Weights & Biases vs Braintrust FAQ
What is the difference between Weights & Biases and Braintrust?
Weights & Biases: Experiment tracking and LLM observability, now part of CoreWeave. Braintrust: Evaluation and observability platform for shipping reliable AI apps. Both are models & apis tools.
Is Weights & Biases or Braintrust cheaper?
Weights & Biases has the lower starting price: about $60 a month, against $249 for Braintrust.
Do Weights & Biases and Braintrust have free plans?
Weights & Biases: Yes. Braintrust: Yes.
Who makes Weights & Biases?
Weights & Biases is made by CoreWeave, based in United States.
Who makes Braintrust?
Braintrust is made by Braintrust, based in United States.
Which should I choose, Weights & Biases or Braintrust?
Choose Weights & Biases if you value industry-standard experiment tracking and polished dashboards. Choose Braintrust if you value strong eval workflow and good for product teams.