kitio.aiLangSmith vs Weights & Biases
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. LangSmith has the lower starting price: about $39 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
- Agent tracing
- Datasets and evaluators
- Prompt hub
- Agent deployment
- Online monitoring
- Experiment tracking
- Hyperparameter sweeps
- Model registry
- Weave LLM tracing
- Reports
| Feature | LangSmith | Weights & Biases |
|---|---|---|
| Best for | Tracing, evaluation and deployment platform for LLM agents | Experiment tracking and LLM observability, now part of CoreWeave |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | $39/mo | $60/mo |
| Free plan | Yes | Yes |
| Made by | LangChain | CoreWeave |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
|
Pricing compared
LangSmith has the lower starting price: about $39 a month, against $60 for Weights & Biases.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Developer
Free
- 1 seat
- 5k base traces / month, then pay as you go
- Community support
Plus
$39/mo
- Per seat
- 10k base traces / month, then pay as you go
- Access to Deployment and Engine
- Unlimited seats
Enterprise
Custom
- Self-hosted and hybrid deployment
- Custom SSO, ABAC and RBAC
- Support SLA
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
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
LangSmith
- Detailed agent traces
- Strong LangGraph integration
- Works with any framework
- Per-seat pricing adds up
- Trace retention costs extra
- Self-hosting is enterprise-only
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
Which one should you choose?
Choose LangSmith if you want:
- Detailed agent traces
- Strong LangGraph integration
- Works with any framework
Watch out: per-seat pricing adds up.
Choose Weights & Biases if you want:
- Industry-standard experiment tracking
- Polished dashboards
- Covers training and LLM apps
Watch out: pricing jumps for larger teams.
LangSmith vs Weights & Biases FAQ
What is the difference between LangSmith and Weights & Biases?
LangSmith: Tracing, evaluation and deployment platform for LLM agents. Weights & Biases: Experiment tracking and LLM observability, now part of CoreWeave. Both are models & apis tools.
Is LangSmith or Weights & Biases cheaper?
LangSmith has the lower starting price: about $39 a month, against $60 for Weights & Biases.
Do LangSmith and Weights & Biases have free plans?
LangSmith: Yes. Weights & Biases: Yes.
Who makes LangSmith?
LangSmith is made by LangChain, based in United States.
Who makes Weights & Biases?
Weights & Biases is made by CoreWeave, based in United States.
Which should I choose, LangSmith or Weights & Biases?
Choose LangSmith if you value detailed agent traces and strong langgraph integration. Choose Weights & Biases if you value industry-standard experiment tracking and polished dashboards.