kitio.aiLangSmith vs Arthur
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 Arthur.
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
- Agent discovery
- Step-level tracing
- Runtime guardrails
- Audit logs and lineage
- Custom metrics and alerts
| Feature | LangSmith | Arthur |
|---|---|---|
| Best for | Tracing, evaluation and deployment platform for LLM agents | Discovery, monitoring and governance for enterprise AI agents |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | $39/mo | $60/mo |
| Free plan | Yes | Yes |
| Made by | LangChain | Arthur AI |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
LangSmith has the lower starting price: about $39 a month, against $60 for Arthur.
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
- 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
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
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 LangSmith if you want:
- Detailed agent traces
- Strong LangGraph integration
- Works with any framework
Watch out: per-seat pricing adds up.
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.
LangSmith vs Arthur FAQ
What is the difference between LangSmith and Arthur?
LangSmith: Tracing, evaluation and deployment platform for LLM agents. Arthur: Discovery, monitoring and governance for enterprise AI agents. Both are models & apis tools.
Is LangSmith or Arthur cheaper?
LangSmith has the lower starting price: about $39 a month, against $60 for Arthur.
Do LangSmith and Arthur have free plans?
LangSmith: Yes. Arthur: Yes.
Who makes LangSmith?
LangSmith is made by LangChain, based in United States.
Who makes Arthur?
Arthur is made by Arthur AI, based in United States.
Which should I choose, LangSmith or Arthur?
Choose LangSmith if you value detailed agent traces and strong langgraph integration. Choose Arthur if you value finds shadow agents across environments and free tier with unlimited seats.