kitio.aiWeights & Biases vs PromptLayer
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. PromptLayer has the lower starting price: about $49 a month, against $60 for Weights & Biases.
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
- Prompt registry
- Visual prompt editor
- Evaluation pipelines
- Request logging
- Release labels
| Feature | Weights & Biases | PromptLayer |
|---|---|---|
| Best for | Experiment tracking and LLM observability, now part of CoreWeave | Prompt management and evals for teams where non-engineers edit prompts |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | $60/mo | $49/mo |
| Free plan | Yes | Yes |
| Made by | CoreWeave | PromptLayer |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
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Pricing compared
PromptLayer has the lower starting price: about $49 a month, against $60 for Weights & Biases.
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
4 plans
Free
Free
- 5 users
- 2.5K requests/month
- 1 workspace
Pro
$49/mo
- Unlimited workspaces and playgrounds
- 150MB max per dataset
- Overage $0.003 per request
Team
$500/mo
- 25 users
- 100K+ requests/month
- Overage $0.002 per request
Enterprise
Custom
- Custom limits
- RBAC and deployment approvals
- HIPAA with BAA
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
PromptLayer
- Friendly for non-engineers
- Simple prompt versioning
- Backtests on real traffic
- Less depth on agent tracing
- Limits on lower plans
- Smaller ecosystem
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 PromptLayer if you want:
- Friendly for non-engineers
- Simple prompt versioning
- Backtests on real traffic
Watch out: less depth on agent tracing.
Weights & Biases vs PromptLayer FAQ
What is the difference between Weights & Biases and PromptLayer?
Weights & Biases: Experiment tracking and LLM observability, now part of CoreWeave. PromptLayer: Prompt management and evals for teams where non-engineers edit prompts. Both are models & apis tools.
Is Weights & Biases or PromptLayer cheaper?
PromptLayer has the lower starting price: about $49 a month, against $60 for Weights & Biases.
Do Weights & Biases and PromptLayer have free plans?
Weights & Biases: Yes. PromptLayer: Yes.
Who makes Weights & Biases?
Weights & Biases is made by CoreWeave, based in United States.
Who makes PromptLayer?
PromptLayer is made by PromptLayer, based in United States.
Which should I choose, Weights & Biases or PromptLayer?
Choose Weights & Biases if you value industry-standard experiment tracking and polished dashboards. Choose PromptLayer if you value friendly for non-engineers and simple prompt versioning.