Traceloop vs LangSmith: Which is Better in 2026?
Choosing between Traceloop and LangSmith comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
Traceloop
Accelerate LLM application development with continuous evaluation and monitoring.
Best for you if:
- • You need AI assistants features specifically
- • Provides continuous evaluation and monitoring for LLM applications.
- • Offers instant visibility into LLM performance and quality with built-in and custom metrics.
LangSmith
Debug, monitor, and optimize your LLM applications and AI agents with comprehensive observability.
Best for you if:
- • You need AI agents features specifically
- • Debug LLM applications with detailed agent tracing.
- • Monitor key business metrics with live dashboards and alerts.
| At a Glance |  Traceloop |  LangSmith |
|---|---|---|
Starts at | Contact us/moEnterprise | Free tier + paid plansFree tier available |
Best For | AI Assistants | AI Agents |
Rating | - | - |
Choose Traceloop or LangSmith?
Choose Traceloop if
Accelerate LLM application development with continuous evaluation and monitoring.
- Quick setup with one line of code for immediate visibility.
- Offers both standard and custom evaluation capabilities for tailored quality definitions.
- Integrates seamlessly into existing development workflows and tech stacks.
- Your work is AI assistants-shaped, not AI agents-shaped
Choose LangSmith if
Debug, monitor, and optimize your LLM applications and AI agents with comprehensive observability.
- Provides deep visibility into non-deterministic LLM behavior
- Helps improve application performance and response quality
- Offers comprehensive monitoring and alerting capabilities
- Your work is AI agents-shaped, not AI assistants-shaped
| Feature | Traceloop | LangSmith |
|---|---|---|
| Pricing Model | Freemium | Freemium |
| User Rating | No ratings yet | No ratings yet |
| Categories | AI AssistantsDeveloper Tools | AI AgentsDeveloper Tools |
In-Depth Analysis
Traceloop
Accelerate LLM application development with continuous evaluation and monitoring.
Strengths
- +Quick setup with one line of code for immediate visibility.
- +Offers both standard and custom evaluation capabilities for tailored quality definitions.
- +Integrates seamlessly into existing development workflows and tech stacks.
- +Built on open standards, reducing vendor lock-in.
- +Enterprise-ready with compliance and flexible deployment options.
Weaknesses
- -The free tier has a limit of 50,000 spans per month, which might be restrictive for larger projects.
- -Requires understanding of LLM evaluation metrics to fully leverage custom evaluators.
Key features
LangSmith
Debug, monitor, and optimize your LLM applications and AI agents with comprehensive observability.
Strengths
- +Provides deep visibility into non-deterministic LLM behavior
- +Helps improve application performance and response quality
- +Offers comprehensive monitoring and alerting capabilities
- +Identifies systemic issues and user needs automatically
- +Flexible integration with various frameworks and OTel
Weaknesses
- -Specific pricing details require visiting a separate page
- -Self-hosting is only available on the enterprise plan
- -Requires some setup (e.g., environment variables) to get started
Key features
Pricing: Traceloop vs LangSmith
| Plan | Traceloop | LangSmith |
|---|---|---|
| Tier 1 | $0 / mo Free Forever | N/A |
| Tier 2 | Contact us Enterprise | N/A |
Pricing verified from each vendor's public pricing page. Compare in detail on Traceloop pricing and LangSmith pricing.
Who Should Use What?
On a budget?
Both are freemium. Compare plans on their websites.
Go with: Traceloop
Want the highest-rated option?
Neither has user reviews yet.
Go with: Traceloop
Value user reviews?
Neither has user reviews yet.
Go with: Traceloop
3 Questions to Help You Decide
What's your budget?
Both are freemium. Pricing won't help you decide here.
What's your use case?
Traceloop is a AI assistants tool. LangSmith is in AI agents. Pick the category that matches your needs.
How important are ratings?
Neither has user reviews yet.
Key Takeaways
Traceloop
- Free tier available
- Our pick for this comparison
LangSmith
- Better fit for AI agents
The Bottom Line
Traceloop is our pick.
Frequently Asked Questions
Is Traceloop or LangSmith better?
Traceloop is rated in our evaluation. Both are freemium.
What are Traceloop and LangSmith used for?
Traceloop: Accelerate LLM application development with continuous evaluation and monitoring.. LangSmith: Debug, monitor, and optimize your LLM applications and AI agents with comprehensive observability..
What does Traceloop cost vs LangSmith?
Traceloop is freemium (free tier + paid plans). LangSmith is freemium (free tier + paid plans). Visit their websites for detailed pricing.