AI testing & review
AI safety and control infrastructure for guardrails, monitoring and red-teaming
Ahrefs Domain Rating set in type 8 Nov 2026, reset 8 Nov 2026.
White Circle builds tools to control how AI systems behave through guardrails, monitoring, and red-teaming, enabling companies to define policies and enforce
White Circle is an AI safety company that provides infrastructure to control advanced AI systems. The company builds guardrails, monitoring, and red-teaming tools that enable organizations to define behavioral policies in plain language and enforce them in real time across AI inputs, outputs, and tool calls.
Beyond product, White Circle publishes research in AI safety and security, studying how AI systems fail in production environments. The company conducts adversarial testing and behavioral evaluations designed to surface undocumented failure modes, with findings fed directly into its product and shared with the broader field.
Founded in 2025, White Circle operates as a Public Benefit Corporation and is backed by senior leaders and researchers from leading AI companies including OpenAI, Anthropic, HuggingFace, DeepMind, Mistral, and Datadog. The company has raised $70M in funding.
Pricing model: Contact for pricing
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| External backlinks | 2,650 no change since last check |
Ahrefs Domain Rating set in type 8 Nov 2026, reset 8 Nov 2026. Lead topic: Computers/Internet (6). Majestic set 8 Nov 2026, reset 8 Nov 2026. Link data typeset by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
| Domain age | 23 years |
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| Registrar | GoDaddy.com, LLC |
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White Circle builds tools that control how AI systems behave through guardrails, monitoring, and red-teaming. Companies define policies in plain language, and White Circle's models check every input, output, and tool call against those rules in real time.
Halo is White Circle's open-source framework for post-training open models. It is up to 3.5× faster than TRL and provides methods including SFT, DPO, SMPO, GRPO, offline GRPO, online distillation, and reward modeling, with support for various parallelism strategies.
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