Langfuse vs LangSmith: Pricing and Ratings Compared (2026)
Entry prices and free plans as read on each vendor's pricing page, and user ratings as published on review sites, for Langfuse and LangSmith side by side. This page compares data; it is not a hands-on review.
On the data: On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
Langfuse
Open Source LLM Engineering Platform for debugging and improving your LLM application.
LangSmith
Debug, monitor, and optimize your LLM applications and AI agents with comprehensive observability.
Best for you if:
- • You want a tool that provides deep visibility into non-deterministic LLM behavior
| At a Glance | Langfuse | LangSmith |
|---|---|---|
Starts at | Free plan, paid from $29/mo flat, billed monthly Core plan | Free plan, paid from $39/seat/mo, billed monthly Plus plan |
Category | Developer Tools AI Observability | AI Agents Developer Tools |
Rating | n/a | n/a |
Free plan | Yes | Yes |
Watch out for | Usage beyond included units at $8/100k units (graduated, lower with volume) | Traces over the included 5k/10k are pay-as-you-go. Seats are only the floor. |
Choose Langfuse or LangSmith?
Choose Langfuse if
- You need developer tools features specifically.
Choose LangSmith if
- You want a tool that provides deep visibility into non-deterministic LLM behavior
- You want a tool that helps improve application performance and response quality
In-Depth Analysis
Langfuse
Open Source LLM Engineering Platform for debugging and improving your LLM application.
Langfuse's pricing is quite generous, with a free Hobby tier offering 50k units per month, 30 days of data access and 2 users.
Watch out
Usage beyond included units at $8/100k units (graduated, lower with volume)
Strengths
- Pro: Open source LLM observability
- Pro: Self-hostable
- Pro: Good tracing
- Pro: Prompt management
- Pro: Active development
Weaknesses
- Con: Newer platform
- Con: Documentation improving
- Con: Cloud features limited
- Con: Smaller community
- Con: Enterprise features developing
Key features
LangSmith
Debug, monitor, and optimize your LLM applications and AI agents with comprehensive observability.
LangSmith Developer is $0 for one seat and 5,000 base traces/month.
Watch out
Traces over the included 5k/10k are pay-as-you-go. Seats are only the floor.
Strengths
- Pro: Provides deep visibility into non-deterministic LLM behavior
- Pro: Helps improve application performance and response quality
- Pro: Offers comprehensive monitoring and alerting capabilities
- Pro: Identifies systemic issues and user needs automatically
- Pro: Flexible integration with various frameworks and OTel
Weaknesses
- Con: Specific pricing details require visiting a separate page
- Con: Self-hosting is only available on the enterprise plan
- Con: Requires some setup (e.g., environment variables) to get started
Key features
Plans and prices: Langfuse vs LangSmith
| Tool | Plans and prices | Source |
|---|---|---|
| Langfuse |
| langfuse.com/pricing read Nov 9, 2026 |
| LangSmith |
| langchain.com/pricing read Nov 11, 2026 |
Prices as read on each vendor's own pricing page on the date shown. Plans are listed per tool and are not matched against the other tool's plans: a plan name or price in one column says nothing about the same row in the other. Details on Langfuse pricing and LangSmith pricing.
Key Takeaways
Langfuse
- Worth considering for developer tools
LangSmith
- Worth considering for AI agents
What the data shows
On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
- Entry prices are not ranked, they are charged on different bases: Langfuse $29/mo flat, billed monthly; LangSmith $39/seat/mo, billed monthly.
- Both have a free plan.
Criteria: user rating (only above 20 reviews on both sides, gap of 0.2 or more), entry price (only on the same billing basis), free plan. How we rate
Frequently Asked Questions
How do Langfuse and LangSmith compare in 2026?
On the data below the two are close or not directly comparable, so we do not name a winner for this pair. Entry prices are not ranked, they are charged on different bases: Langfuse $29/mo flat, billed monthly; LangSmith $39/seat/mo, billed monthly. Both have a free plan.
What are Langfuse and LangSmith used for?
Langfuse: Open Source LLM Engineering Platform for debugging and improving your LLM application. LangSmith: Debug, monitor, and optimize your LLM applications and AI agents with comprehensive observability.
What does Langfuse cost vs LangSmith?
Langfuse's cheapest paid plan is Core at $29/mo flat, billed monthly; it also has a free plan. LangSmith's cheapest paid plan is Plus at $39/seat/mo, billed monthly; it also has a free plan. Prices read on the vendors' pricing pages, latest check Nov 11, 2026.
What's the main difference between Langfuse and LangSmith?
Langfuse's main strength: open source LLM observability. LangSmith's main strength: provides deep visibility into non-deterministic LLM behavior.
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