LangSmith vs Promptfoo

Detailed regulatory comparison mapping timeline compliance, pricing model, technical capabilities, and data residency.

Feature / Parameter	LangSmith	Promptfoo
HQ & Data Sovereignty	San Francisco, USA US-Hosted	San Francisco, USA US-Hosted
Target Role	PROVIDER	PROVIDER
Pricing Tier	$39/seat/mo (Freemium)	$0 / $299/mo (Freemium)
Active 2026 Focus	LLM Dataset Quality Evals Output Regression Testing	Article 50 Hallucination & Security Defense
Prepare 2027/2028 (High-Risk)	Article 12 Execution Traces for Agent Chains	Article 15 Continuous Red-Teaming
Model Evals & Red-Teaming	✅ Supported	✅ Supported
Annex IV Technical Documentation	❌ Not Available	❌ Not Available
ISO 42001 Control Mapping	❌ Not Available	❌ Not Available
Verified Audit Source	Inspect Evidence (2026-08-13) ↗	Inspect Evidence (2026-08-15) ↗

Run our interactive 3-step Assessment Engine to match your specific model tier, budget, and EU compliance deadline.