Is Nightfall CMMC compliant?

Nightfall is a capable cloud DLP, but its published architecture scans content in Nightfall's cloud — so CUI transits a third party in order to be inspected. CMMC assessors evaluate where CUI flows; that data path is what gets assessed, regardless of the vendor's own certifications.

What's the cheapest way to get CMMC-grade AI monitoring?

For most small and mid-size contractors, a self-hosted proxy is the lowest-cost compliant architecture: HoundShield starts with a $499 one-time assessment and published plans, versus enterprise-quoted cloud DLP contracts or a six-figure GCC High migration.

Can I just use Microsoft Purview instead?

If you're already in GCC High with E5/G5 licensing, Purview plus Copilot inside that boundary is a legitimate architecture. If you're not, the migration typically runs $149K–$200K per year — the cost math is walked through in our GCC High vs AI proxy analysis.

Answers · CMMC & AI compliance

What are the best Nightfall alternatives for CMMC?

For CMMC teams, the Nightfall alternatives worth evaluating are HoundShield (local-only scanning on your own infrastructure), Prompt Security (cloud-first enterprise suite, with an on-prem SKU announced in 2026), Strac and Polymer (cloud SaaS DLP), and Microsoft Purview inside GCC High (for large all-Microsoft contractors). The deciding question is architectural: where does prompt content go to be scanned, and at what price of entry? Nightfall and most alternatives inspect content in the vendor's cloud — for CUI, that transit is itself the exposure. A locally deployed scanner keeps the data path inside your boundary.

The architectural filter that shortens the list

Every AI DLP tool answers one question differently: where is the prompt scanned? Cloud-routed tools (Nightfall, Strac, Polymer, browser-plugin products) transmit content to the vendor to inspect it — strong general-purpose privacy tools, but for DFARS 7012-covered data the transmission is the problem. Locally deployed scanners inspect content on your own infrastructure, so nothing leaves the boundary in order to be checked.

That filter matters more than feature lists. A contractor who cannot let CUI transit a vendor cloud has a short list by definition.

The alternatives, honestly compared

Full head-to-head pages with matrices and when-to-choose-them guidance: HoundShield vs Nightfall, vs Prompt Security, vs Strac, vs Polymer, and vs Microsoft Purview + GCC High are all on the compare hub.

Tool	Where scanning happens	Best for
HoundShield	Your own network (self-hosted Docker; air-gapped option)	5–500 person contractors needing CMMC evidence
Prompt Security (SentinelOne)	Vendor cloud by default; on-prem as enterprise SKU	Enterprises standardizing on SentinelOne
Strac	Vendor cloud	Broad SaaS DLP (email, ticketing, chat)
Polymer	Vendor cloud	Low-cost general SaaS DLP for non-regulated data
Purview + GCC High Copilot	US-sovereign Microsoft boundary	200+ person all-Microsoft DIB orgs

What only HoundShield adds for CMMC specifically

Beyond the local data path, the deliverable differs: HoundShield produces a $499 one-time CMMC AI Risk Assessment — a SHA-256-signed PDF risk-scoring every AI prompt event against NIST 800-171 Rev 2 controls. General DLP tools produce dashboards; assessors read control-mapped evidence.

Frequently asked questions

Use AI without leaking CUI

HoundShield scans every AI prompt locally and blocks CUI before it leaves your network. One URL change. Under 10 minutes. C3PAO-ready.

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