kitio.aiLangSmith vs Pydantic Logfire
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. LangSmith has the lower starting price: about $39 a month, against $49 for Pydantic Logfire.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Agent tracing
- Datasets and evaluators
- Prompt hub
- Agent deployment
- Online monitoring
- OpenTelemetry tracing
- LLM call views
- Auto-instrumentation
- SQL queries on traces
- Dashboards
| Feature | LangSmith | Pydantic Logfire |
|---|---|---|
| Best for | Tracing, evaluation and deployment platform for LLM agents | OpenTelemetry observability for Python apps and AI agents |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | $39/mo | $49/mo |
| Free plan | Yes | Yes |
| Made by | LangChain | Pydantic |
| Based in | United States | United Kingdom |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
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Pricing compared
LangSmith has the lower starting price: about $39 a month, against $49 for Pydantic Logfire.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Developer
Free
- 1 seat
- 5k base traces / month, then pay as you go
- Community support
Plus
$39/mo
- Per seat
- 10k base traces / month, then pay as you go
- Access to Deployment and Engine
- Unlimited seats
Enterprise
Custom
- Self-hosted and hybrid deployment
- Custom SSO, ABAC and RBAC
- Support SLA
4 plans
Personal
Free
- 10M records per month, hard-capped
- 3 projects, 30-day retention
- 1 seat + 2 read-only guests
Team
$49/mo
- 10M records included, $2/M after
- 5 seats included, $25/extra seat
- AI evaluations and human review
Growth
$249/mo
- Unlimited seats and projects
- Up to 90-day retention
- Priority support and BAA
Enterprise
Contact sales
- Compliance support
- Self-hosting options
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
LangSmith
- Detailed agent traces
- Strong LangGraph integration
- Works with any framework
- Per-seat pricing adds up
- Trace retention costs extra
- Self-hosting is enterprise-only
Pydantic Logfire
- Full-stack plus LLM traces
- Easy setup for Python
- SQL access to data
- Python-first experience
- Fewer eval tools than rivals
- Volume pricing needs monitoring
Which one should you choose?
Choose LangSmith if you want:
- Detailed agent traces
- Strong LangGraph integration
- Works with any framework
Watch out: per-seat pricing adds up.
Choose Pydantic Logfire if you want:
- Full-stack plus LLM traces
- Easy setup for Python
- SQL access to data
Watch out: python-first experience.
LangSmith vs Pydantic Logfire FAQ
What is the difference between LangSmith and Pydantic Logfire?
LangSmith: Tracing, evaluation and deployment platform for LLM agents. Pydantic Logfire: OpenTelemetry observability for Python apps and AI agents. Both are models & apis tools.
Is LangSmith or Pydantic Logfire cheaper?
LangSmith has the lower starting price: about $39 a month, against $49 for Pydantic Logfire.
Do LangSmith and Pydantic Logfire have free plans?
LangSmith: Yes. Pydantic Logfire: Yes.
Who makes LangSmith?
LangSmith is made by LangChain, based in United States.
Who makes Pydantic Logfire?
Pydantic Logfire is made by Pydantic, based in United Kingdom.
Which should I choose, LangSmith or Pydantic Logfire?
Choose LangSmith if you value detailed agent traces and strong langgraph integration. Choose Pydantic Logfire if you value full-stack plus llm traces and easy setup for python.