Patronus AI vs promptfoo

Pick two tools from the same category to compare side-by-side.

	Patronus AI Automated LLM evaluation and guardrails platform with proprietary evaluation models.	promptfoo Open-source CLI for prompt and LLM eval, including red-teaming.
Category	eval	eval
Vendor type	commercial	open source
Pricing	usage	free
Strengths	+ Proprietary evaluation models like Lynx and GLIDER for hallucination detection + Self-serve API with usage-based pricing and free starting credits + Percival agent debugger for agentic failure modes + Strong fit for regulated, high-stakes domains	+ Open source, CLI-first + Strong red-team / security eval modules + Easy to wire into CI
Tradeoffs	− Closed-source and commercial, no self-hosted option − Usage-based costs can scale with high request volume	− Less polished UI than commercial alternatives
Used in stacks	0	3