Braintrust 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 Braintrust and LangSmith side by side. This page compares data; it is not a hands-on review.
On the data: On the data below, LangSmith 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:
Braintrust
Observability and evaluation platform for AI agents: trace production runs, score outputs with evals and build datasets from real traces.
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 | Braintrust | LangSmith |
|---|---|---|
Starts at | Free plan, paid from $249/mo, billed monthly Pro plan | Free plan, paid from $39/seat/mo, billed monthly Plus plan |
Category | AI Observability Testing & QA | AI Agents Developer Tools |
Rating | n/a | n/a |
Free plan | Yes | Yes |
Watch out for | 1 GB processed data, then $4 per GB (Starter) | Traces over the included 5k/10k are pay-as-you-go. Seats are only the floor. |
Choose Braintrust or LangSmith?
Choose Braintrust if
- You need AI observability 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
- Budget matters ($39/seat/mo, billed monthly vs $249/mo, billed monthly)
In-Depth Analysis
Braintrust
Observability and evaluation platform for AI agents: trace production runs, score outputs with evals and build datasets from real traces.
Braintrust's free tier is generous for small projects, but the Pro plan's overage charges on processed data and scores can escalate quickly for high-volume teams.
Watch out
1 GB processed data, then $4 per GB (Starter)
Strengths
- Pro: Free Starter plan with no credit card required
- Pro: Users, projects, experiments and datasets are unlimited on Starter and Pro
- Pro: Pricing is metered on data and scores, so a larger team does not add seat fees
- Pro: Enterprise offers on-prem or hosted deployment, a BAA and an uptime SLA
Weaknesses
- Con: Starter keeps 14 days of data and 10k scores; usage beyond that is billed at usage-based rates
- Con: Pro is a paid plan, and there is no plan between Starter and Pro
- Con: Retention beyond 30 days on Pro has an additional monthly charge
- Con: Enterprise pricing is not published
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: Braintrust vs LangSmith
| Tool | Plans and prices | Source |
|---|---|---|
| Braintrust |
| braintrust.dev/pricing read Nov 12, 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 Braintrust pricing and LangSmith pricing.
Key Takeaways
Braintrust
- Worth considering for AI observability
LangSmith
- Lower entry price: $39/seat/mo, billed monthly vs $249/mo, billed monthly
What the data shows
On the data below, LangSmith leads on lower entry price. We do not name an overall winner for this pair.
- LangSmith has the lower entry price: $39/seat/mo, billed monthly (Plus) against $249/mo, billed monthly (Pro) for Braintrust.
- 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 Braintrust and LangSmith compare in 2026?
On the data below, LangSmith leads on lower entry price. We do not name an overall winner for this pair. LangSmith has the lower entry price: $39/seat/mo, billed monthly (Plus) against $249/mo, billed monthly (Pro) for Braintrust. Both have a free plan.
What are Braintrust and LangSmith used for?
Braintrust: Observability and evaluation platform for AI agents: trace production runs, score outputs with evals and build datasets from real traces. LangSmith: Debug, monitor, and optimize your LLM applications and AI agents with comprehensive observability.
What does Braintrust cost vs LangSmith?
Braintrust's cheapest paid plan is Pro at $249/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 12, 2026.
What's the main difference between Braintrust and LangSmith?
Braintrust's main strength: free Starter plan with no credit card required. LangSmith's main strength: provides deep visibility into non-deterministic LLM behavior.
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