If you've decided a managed CUI enclave is the right path, you’ll find the market for enclave solutions is a crowded one. Vendors that look similar at first glance are structured in fundamentally different ways, with different ownership models, different coverage, and different long-term costs. 

This article breaks the market into its main categories and gives you a set of evaluation criteria that will help you decide between the different vendors you're considering.

The three main categories of enclave solutions

Most vendor-provided enclave solutions fall into one of three archetypes. Understanding which category a vendor belongs to tells you more about what you're buying than any feature list.

Full-service managed security providers

These are services firms that design, build, and operate your enclave for you, typically in Microsoft GCC High or Azure Government, with an ongoing managed services contract covering maintenance, monitoring, and compliance support.

What you're buying is expertise delivered as a service. The firm's team handles the technical work, and your organization consumes the result. This model fits large organizations with the budget for permanent managed services and contractors who want compliance fully handled by someone else, with no internal operational responsibility.

The tradeoffs: you're paying for a team's time indefinitely, not acquiring a capability your organization owns. There's typically no self-service platform, and if the relationship ends, so does much of your operational compliance capacity. For mid-sized contractors, the recurring cost of a services retainer often exceeds what a platform-based approach costs over the same period.

Encrypted overlay tools

These solutions take a different approach entirely: rather than building an isolated environment, they layer end-to-end encryption over your existing commercial email and file sharing, so CUI can be protected without migrating to a government cloud.

Deployment is fast, your team keeps its familiar tools, and you avoid the licensing and migration costs of GCC High. For very small contractors whose CUI exposure is limited to receiving the occasional controlled document by email, this can be a reasonable entry point.

The limitation is coverage. An overlay tool addresses CUI in email and file sharing, but a full compliance program also covers endpoints, monitoring and logging, vulnerability management, device management, and the documentation connecting it all. Overlay vendors' own materials generally acknowledge that their tools address most but not all of the required controls. That means assembling additional tools to close the gaps, and owning the integration work between them. The result is protection for one slice of the requirement, with the rest of the program still yours to build.

Managed enclave platforms

The third category provisions a complete, pre-configured enclave environment, typically in GCC High, Azure Government, or Google Workspace, and pairs it with compliance automation: documentation generated from the live environment, guided workflows for control implementation, drift detection, and continuous evidence collection.

The distinguishing feature of this model is that you own the tenant. The vendor configures and maintains the environment, but it's yours, and it persists if you change vendors. This is the approach Secureframe Defense takes, provisioning the enclave alongside the compliance automation that documents and monitors it.

The tradeoffs run in the other direction from the services model: your team retains operational involvement rather than handing everything off, and the automation-first approach fits organizations comfortable working in a platform. Contractors who want zero internal responsibility may prefer the full-service model despite its cost.

How to evaluate CUI enclave solutions

Run every vendor on your shortlist through the same list questions: 

Who owns the environment? 

If the vendor owns the infrastructure and you pay per seat, ask what migration looks like if you leave. If you own the tenant, confirm what the vendor's role is and what happens to configuration and documentation if the relationship ends.

How much of the compliance requirement does it cover?

Ask every vendor for a shared responsibility matrix mapping their solution against all 110 NIST SP 800-171 controls, specifying for each control what the vendor handles, what's shared, and what remains your responsibility. A vendor that produces this precisely and names its gaps is more credible than one that gestures at completeness. Then consider what closing your side of the gaps requires and what it costs.

What's the endpoint strategy? 

How users access CUI determines whether their devices land in your compliance scope. Solutions built around virtual desktops keep physical devices out of scope; solutions relying on local device access require device management that meets federal requirements. Confirm which model the vendor supports and whether it matches how your team works.

Where does documentation come from? 

Your SSP and POA&M have to reflect your live environment. Ask whether documentation is generated from actual configuration data or written from templates, and who updates it when the environment changes. Documentation drift is one of the most common compliance findings, and the answer to this question determines how much of that risk you carry.

What's the true cost model? 

Compare total cost over three to five years, not first-year pricing. Services retainers compound annually. Per-seat hosted pricing scales with headcount. Platform subscriptions typically bundle capabilities you'd otherwise license separately. And in every model, ask what's excluded: licensing, migration support, assessment preparation, and remediation help are frequent gaps between the quote and the real cost.

What happens when requirements change? 

CMMC and its underlying frameworks are actively evolving. Ask how the vendor handled recent changes, and what their process is for updating configurations, documentation, and guidance when requirements shift. A vendor's track record during change is one of the strongest signals of what the relationship will feel like over years.

Choosing the right category for your situation

If you're a large organization that can fund a permanent services relationship, the full-service model might be the right approach for your needs. If you're a small contractor with very narrow CUI exposure limited to email and file exchange, an overlay tool may be a suitable starting point. For most contractors that want a complete solution without a permanent services dependency, a managed platform model offers the most durable balance of coverage, ownership, and cost.