Comet ML 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 Comet ML and LangSmith side by side. This page compares data; it is not a hands-on review.
On the data: On the data below, Comet ML leads on lower entry price; LangSmith leads on a free plan. We do not name an overall 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:
Comet ML
Machine learning experiment tracking platform
LangSmith
Debug, monitor, and optimize your LLM applications and AI agents with comprehensive observability.
Best for you if:
- • You want a free tier before you commit
| At a Glance | Comet ML | LangSmith |
|---|---|---|
Starts at | From $19/user/mo, billed monthly Pro plan | Free plan, paid from $39/seat/mo, billed monthly Plus plan |
Category | Analytics Developer Tools | AI Agents Developer Tools |
Rating | 4.3/5 G2 4.3 26 reviews | n/a |
Free plan | No | Yes |
Watch out for | Overage fees for training hours on Pro tier | Traces over the included 5k/10k are pay-as-you-go. Seats are only the floor. |
Choose Comet ML or LangSmith?
Choose Comet ML if
- Budget matters ($19/user/mo, billed monthly vs $39/seat/mo, billed monthly)
Choose LangSmith if
- You want a free tier before you commit
- 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
Comet ML
Machine learning experiment tracking platform
Comet ML's pricing is quite generous, especially with a robust Free tier offering 100GB storage and core tracking.
Watch out
Overage fees for training hours on Pro tier
Strengths
- Pro: Experiment tracking
- Pro: Model production monitoring
- Pro: Good visualizations
- Pro: Fair pricing
- Pro: LLM support
Weaknesses
- Con: Less known
- Con: Smaller community
- Con: Some features basic
- Con: Documentation gaps
- Con: Integration limitations
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: Comet ML vs LangSmith
| Tool | Plans and prices | Source |
|---|---|---|
| Comet ML |
| comet.com/pricing read Oct 4, 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 Comet ML pricing and LangSmith pricing.
Key Takeaways
Comet ML
- Lower entry price: $19/user/mo, billed monthly vs $39/seat/mo, billed monthly
LangSmith
- Has a free plan
What the data shows
On the data below, Comet ML leads on lower entry price; LangSmith leads on a free plan. We do not name an overall winner for this pair.
- Only Comet ML has a published user rating (4.3/5 from 26 reviews); LangSmith has none we can show.
- Comet ML has the lower entry price: $19/user/mo, billed monthly (Pro) against $39/seat/mo, billed monthly (Plus) for LangSmith.
- Only LangSmith has 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 Comet ML and LangSmith compare in 2026?
On the data below, Comet ML leads on lower entry price; LangSmith leads on a free plan. We do not name an overall winner for this pair. Only Comet ML has a published user rating (4.3/5 from 26 reviews); LangSmith has none we can show. Comet ML has the lower entry price: $19/user/mo, billed monthly (Pro) against $39/seat/mo, billed monthly (Plus) for LangSmith. Only LangSmith has a free plan.
What are Comet ML and LangSmith used for?
Comet ML: Machine learning experiment tracking platform. LangSmith: Debug, monitor, and optimize your LLM applications and AI agents with comprehensive observability.
What does Comet ML cost vs LangSmith?
Comet ML's cheapest paid plan is Pro at $19/user/mo, billed monthly. 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 Comet ML and LangSmith?
Comet ML's main strength: experiment tracking. LangSmith's main strength: provides deep visibility into non-deterministic LLM behavior.
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