Every cloud AI-DLP tool routes your prompts to its servers to scan them — itself a potential CUI spill under DFARS 7012. HoundShield scans locally in under 10ms. Nothing leaves your network.
Nightfall is a mature, ML-driven cloud DLP with strong PII/PHI classifiers — but its ChatGPT protection runs as a browser plugin that sends prompt content to Nightfall's cloud to be scanned. For a defense or healthcare buyer, that transit is itself the exposure you're trying to eliminate.
See the full comparisonPrompt Security is a capable enterprise AI gateway — now part of SentinelOne — that inspects LLM traffic through the browser and a cloud service, with an on-premises SKU announced in 2026 for disconnected environments. The default cloud delivery reintroduces the SC.3.177 transit problem for regulated data; the on-prem option removes it, but arrives as an enterprise platform SKU through enterprise procurement.
See the full comparisonIf your organization is fully migrated to Microsoft 365 GCC High, Purview + Copilot is a strong, compliant option inside that ecosystem. The gap: Purview governs Microsoft Copilot natively; covering third-party browser AI (ChatGPT, Claude, Gemini) leans on Purview Endpoint DLP configured across every device, still doesn't yield a CMMC-mapped AI assessment PDF, and the GCC High path is typically only economical above ~200 seats.
See the full comparisonPolymer is a well-priced, transparent SaaS DLP with good SMB UX. But it's cloud-routed general DLP — it isn't built to keep CUI on-prem, and it doesn't produce a CMMC-mapped assessment artifact.
See the full comparisonStrac is a capable SaaS DLP with strong redaction UX across email, ticketing, and AI surfaces — but like other cloud DLPs, its published architecture inspects content in Strac's cloud. For a buyer whose problem is regulated data leaving the network, the inspection path is the exposure.
See the full comparisonWitnessAI is a serious enterprise AI security and governance platform with deep observability and a federal-friendly channel (it sells through Carahsoft and has heavyweight security leadership on its board). For a 50–500 person contractor, the gap is fit: enterprise platforms mean enterprise procurement, enterprise pricing, and enterprise deployment timelines. HoundShield is built for the buyer who needs enforcement this week and assessor evidence this month.
See the full comparisonThe scanner runs inside your boundary (Mode B). Prompt content — CUI, PHI, PII — is inspected on-premise and never transmitted to a vendor cloud.
A $499 one-time CMMC AI Risk Assessment PDF mapped to NIST 800-171 Rev 2 — the artifact a C3PAO accepts. Dashboards don't pass assessments.
A single OpenAI-compatible proxy covers ChatGPT, Copilot, Claude and any endpoint — not a per-app browser plugin locked to one vendor.
Mode C runs fully offline for IL-5+ and isolated networks — a place cloud-native DLP simply cannot go.
HoundShield scans prompts locally in under 10ms. That CUI-safe property holds only when the scanner runs inside your own boundary. Pick the deployment mode that matches your data:
A · Hosted trial
On Vercel — not FedRAMP-authorized. Demo and non-CUI evaluation only.
B · Self-hosted Docker
Your own infrastructure. CUI-safe — prompt content never leaves your boundary. Right for CUI-handling contractors.
C · Air-gapped
Isolated network. CUI-safe. For enterprise / IL-5+ environments.
Run the proxy for 14 days in your environment and get a $499 CMMC AI Risk Assessment PDF mapped to NIST 800-171 — locally scanned, nothing leaving your network.