Datadog 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 Datadog and LangSmith side by side. This page compares data; it is not a hands-on review.
On the data: On the data below, Datadog leads on lower entry price. 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:
Datadog
Cloud monitoring, security, and AI investigations for DevOps
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 | Datadog | LangSmith |
|---|---|---|
Starts at | Free plan, paid from $8/mo, billed monthly Code Coverage plan | Free plan, paid from $39/seat/mo, billed monthly Plus plan |
Category | Monitoring Log Management | AI Agents Developer Tools |
Rating | 4.4/5 G2 4.4 726 reviews | n/a |
Free plan | Yes | Yes |
Watch out for | APM requires Infrastructure Monitoring on the SAME hosts: you cannot buy APM alone. | Traces over the included 5k/10k are pay-as-you-go. Seats are only the floor. |
Choose Datadog or LangSmith?
Choose Datadog if
- Budget matters ($8/mo, billed monthly vs $39/seat/mo, billed monthly)
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
Datadog
Cloud monitoring, security, and AI investigations for DevOps
Datadog is the most comprehensive observability platform, infrastructure monitoring, APM, logs, RUM, security, and 750+ integrations in one place.
Watch out
APM requires Infrastructure Monitoring on the SAME hosts: you cannot buy APM alone.
Strengths
- Pro: Comprehensive platform
- Pro: Great visualizations
- Pro: 700+ integrations
Weaknesses
- Con: Complex pricing
- Con: Can be expensive
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: Datadog vs LangSmith
| Tool | Plans and prices | Source |
|---|---|---|
| Datadog |
| datadoghq.com/pricing read Nov 7, 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 Datadog pricing and LangSmith pricing.
Key Takeaways
Datadog
- Lower entry price: $8/mo, billed monthly vs $39/seat/mo, billed monthly
LangSmith
- Worth considering for AI agents
What the data shows
On the data below, Datadog leads on lower entry price. We do not name an overall winner for this pair.
- Only Datadog has a published user rating (4.4/5 from 726 reviews); LangSmith has none we can show.
- Datadog has the lower entry price: $8/mo, billed monthly (Code Coverage) against $39/seat/mo, billed monthly (Plus) for LangSmith.
- 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 Datadog and LangSmith compare in 2026?
On the data below, Datadog leads on lower entry price. We do not name an overall winner for this pair. Only Datadog has a published user rating (4.4/5 from 726 reviews); LangSmith has none we can show. Datadog has the lower entry price: $8/mo, billed monthly (Code Coverage) against $39/seat/mo, billed monthly (Plus) for LangSmith. Both have a free plan.
What are Datadog and LangSmith used for?
Datadog: Cloud monitoring, security, and AI investigations for DevOps. LangSmith: Debug, monitor, and optimize your LLM applications and AI agents with comprehensive observability.
What does Datadog cost vs LangSmith?
Datadog's cheapest paid plan is Code Coverage at $8/mo, 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 Datadog and LangSmith?
Datadog's main strength: comprehensive platform. LangSmith's main strength: provides deep visibility into non-deterministic LLM behavior.
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