Helicone vs LangSmith: Which is Better in 2026?
Choosing between Helicone 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:
Helicone
Build reliable AI apps with Helicone: AI Gateway & LLM Observability for debugging, routing, and analysis.
Best for you if:
- • You need API tools features specifically
- • Routes, debugs, and analyzes AI applications.
- • Offers LLM observability and an AI Gateway.
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 |  Helicone |  LangSmith |
|---|---|---|
Starts at | $100/monthPro | Free tier + paid plansFree tier available |
Best For | API Tools | AI Agents |
Rating | - | - |
Choose Helicone or LangSmith?
Choose Helicone if
Build reliable AI apps with Helicone: AI Gateway & LLM Observability for debugging, routing, and analysis.
- LLM observability
- Request logging
- Cost tracking
- Your work is API tools-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 API tools-shaped
| Feature | Helicone | LangSmith |
|---|---|---|
| Pricing Model | Freemium | Freemium |
| User Rating | No ratings yet | No ratings yet |
| Categories | API ToolsDebugging | AI AgentsDeveloper Tools |
In-Depth Analysis
Helicone
Build reliable AI apps with Helicone: AI Gateway & LLM Observability for debugging, routing, and analysis.
Strengths
- +LLM observability
- +Request logging
- +Cost tracking
- +Good for AI apps
- +Fair pricing
Weaknesses
- -Newer platform
- -Limited features
- -Still maturing
- -Integration effort
- -Documentation improving
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: Helicone vs LangSmith
| Plan | Helicone | LangSmith |
|---|---|---|
| Tier 1 | Free Free | N/A |
| Tier 2 | $100 month Pro | N/A |
| Tier 3 | custom Enterprise | N/A |
Pricing verified from each vendor's public pricing page. Compare in detail on Helicone pricing and LangSmith pricing.
Who Should Use What?
On a budget?
Both are freemium. Compare plans on their websites.
Go with: Helicone
Want the highest-rated option?
Neither has user reviews yet.
Go with: Helicone
Value user reviews?
Neither has user reviews yet.
Go with: Helicone
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?
Helicone is a API tools tool. LangSmith is in AI agents. Pick the category that matches your needs.
How important are ratings?
Neither has user reviews yet.
Key Takeaways
Helicone
- Free tier available
- Our pick for this comparison
LangSmith
- Better fit for AI agents
The Bottom Line
Helicone is our pick.
Frequently Asked Questions
Is Helicone or LangSmith better?
Helicone is rated in our evaluation. Both are freemium.
What are Helicone and LangSmith used for?
Helicone: Build reliable AI apps with Helicone: AI Gateway & LLM Observability for debugging, routing, and analysis.. LangSmith: Debug, monitor, and optimize your LLM applications and AI agents with comprehensive observability..
What does Helicone cost vs LangSmith?
Helicone is freemium (free tier + paid plans). LangSmith is freemium (free tier + paid plans). Visit their websites for detailed pricing.