#1
Braintrust
The AI observability platform for building quality AI products
Capabilities Braintrust has that LangSmith doesn't
- Explainability
Common ground: both serve SaaS & Technology.
Alternatives directory
LangSmith alternatives
Vendors in the directory with the most taxonomy overlap with LangSmith — shared frameworks, capabilities, industries, and integrations.
Last checked September 21, 2026How this shortlist is built
Ranking is deterministic: same product category (heaviest signal), then shared framework coverage, capabilities, industries, and integrations documented on each vendor's profile. No editorial narrative has been written for this page yet.
If you want a long-form comparison with pros, cons, and verdicts, see our curated alternatives pages or run the matchmaker.
At-a-glance
| Alternative | Shared frameworks | Shared capabilities | Pricing | |
|---|---|---|---|---|
| Braintrust | — | Model Monitoring, LLM Evaluation, Prompt Management +2 | tiered | Compare |
| Langfuse | — | Model Monitoring, LLM Evaluation, Prompt Management +2 | tiered | Compare |
| Fiddler AI | — | Model Monitoring, Drift Detection, Agent Tracing +1 | tiered | Compare |
| Arize AI | — | Model Monitoring, Agent Tracing, Drift Detection +2 | freemium | Compare |
| WhyLabs | — | Model Monitoring, Drift Detection, LLM Evaluation | tiered | Compare |
| Galileo | — | LLM Evaluation, Agent Tracing | usage based | Compare |
How each alternative compares
#2
Langfuse
Open Source LLM Engineering Platform
#3
Fiddler AI
Observability, evaluation and guardrails for predictive models and LLM agents, with guardrails that run inside your own cloud
Capabilities Fiddler AI has that LangSmith doesn't
- Explainability
- Bias & Fairness Testing
- LLM Observability
- Hallucination Detection
- LLM Guardrails
Capabilities LangSmith has that Fiddler AI doesn't
- Prompt Management
#4
Arize AI
Ship Agents that Work — AI & Agent Engineering Platform for development, observability, and evaluation.
Capabilities Arize AI has that LangSmith doesn't
- LLM Observability
- Bias & Fairness Testing
- Audit Logging
- Hallucination Detection
- LLM Guardrails
#5
WhyLabs
The AI Observability Platform
Capabilities WhyLabs has that LangSmith doesn't
- Bias & Fairness Testing
- LLM Guardrails & Content Filtering
- AI Model Inventory
Capabilities LangSmith has that WhyLabs doesn't
- Agent Tracing
- Prompt Management
#6
Galileo
Evaluation, observability and guardrails for LLM apps and AI agents; acquired by Cisco in 2026 and now sold as Splunk Agent Observability
Capabilities Galileo has that LangSmith doesn't
- LLM Observability
- Hallucination Detection
- LLM Guardrails
- Prompt Injection Defense
- Data Leakage Prevention
Capabilities LangSmith has that Galileo doesn't
- Model Monitoring
- Prompt Management
- Drift Detection
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