kitio.aiLangSmith vs LangWatch
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. LangSmith starts at $39/mo and LangWatch starts at See pricing page. 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
- Agent tracing
- Datasets and evaluators
- Prompt hub
- Agent deployment
- Online monitoring
- LLM tracing
- Agent simulations
- Evals
- AI gateway
- Prompt management
- Red-teaming
| Feature | LangSmith | LangWatch |
|---|---|---|
| Best for | Tracing, evaluation and deployment platform for LLM agents | Tracing, evals and testing for LLM agents in production |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | $39/mo | See pricing page |
| Free plan | Yes | Yes |
| Made by | LangChain | LangWatch |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
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Pricing compared
LangSmith starts at $39/mo and LangWatch starts at See pricing page. Check both pricing pages for current plans.
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
Developer
Free
- 50k events per month
- 14-day data access
- 2 users
- Community support
Growth
€29/core seat/mo
- Per core seat
- 200k events included
- Unlimited simulations, evals and prompts
- Private Slack or Teams support
Enterprise
Custom
- Volume event pricing
- SSO and RBAC
- Forward deployed engineer
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
LangWatch
- Free plan with no card
- Self-hosting available
- Simulations, evals and tracing in one tool
- Prices are shown in euros
- Free plan keeps data for 14 days
- Events are billed beyond the allowance
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 LangWatch if you want:
- Free plan with no card
- Self-hosting available
- Simulations, evals and tracing in one tool
Watch out: prices are shown in euros.
LangSmith vs LangWatch FAQ
What is the difference between LangSmith and LangWatch?
LangSmith: Tracing, evaluation and deployment platform for LLM agents. LangWatch: Tracing, evals and testing for LLM agents in production. Both are models & apis tools.
Is LangSmith or LangWatch cheaper?
LangSmith starts at $39/mo and LangWatch starts at See pricing page. Check both pricing pages for current plans.
Do LangSmith and LangWatch have free plans?
LangSmith: Yes. LangWatch: Yes.
Who makes LangSmith?
LangSmith is made by LangChain, based in United States.
Who makes LangWatch?
LangWatch is made by LangWatch.
Which should I choose, LangSmith or LangWatch?
Choose LangSmith if you value detailed agent traces and strong langgraph integration. Choose LangWatch if you value free plan with no card and self-hosting available.