1. 1. Choosing an AWS Nitro Enclaves Stack in 2026 : Nova Capsule vs. Enclaver vs. Marlin vs. Anjuna, Plus the Other Options That Matter
    1. 1.1. Start with the constraint that shapes everything
    2. 1.2. The evaluation lens
      1. 1.2.1. 1. How close is it to raw Nitro?
      2. 1.2.2. 2. How much application change is required?
      3. 1.2.3. 3. How opinionated is the runtime model?
      4. 1.2.4. 4. How strong is the attestation story?
      5. 1.2.5. 5. How production-ready is the operational story?
      6. 1.2.6. 6. How open is the stack?
      7. 1.2.7. 7. What kind of workload is it really for?
    3. 1.3. 1) AWS-native Nitro Enclaves: the most control, the most work
    4. 1.4. 2) Sparsity Nova / nova-enclave-capsule: a higher-level Nitro application platform
    5. 1.5. 3) Enclaver: the cleaner open-source toolkit route
    6. 1.6. 4) Marlin / Oyster: not just Nitro, but verifiable compute as a network
    7. 1.7. 5) Anjuna: the enterprise lift-and-shift choice
    8. 1.8. 6) Evervault Enclaves: strong developer experience, but not yet full self-hosting
    9. 1.9. 7) Kubernetes / EKS: useful deployment substrate, not a full answer
    10. 1.10. The real segmentation: these products are solving different jobs
      1. 1.10.1. If you want maximum control
      2. 1.10.2. If you want an open, higher-level Nitro application platform
      3. 1.10.3. If you want enterprise migration with minimal code change
      4. 1.10.4. If you want publicly verifiable or decentralized compute
      5. 1.10.5. If you want a managed, developer-friendly enclave experience
      6. 1.10.6. If you want Kubernetes integration
    11. 1.11. My practical take
      1. 1.11.1. AWS-native Nitro Enclaves
      2. 1.11.2. Nova / nova-enclave-capsule
      3. 1.11.3. Enclaver
      4. 1.11.4. Marlin / Oyster
      5. 1.11.5. Anjuna
      6. 1.11.6. Evervault Enclaves
    12. 1.12. The bottom line
    13. 1.13. A simple recommendation matrix
    14. 1.14. Links
      1. 1.14.1. AWS-native Nitro Enclaves
      2. 1.14.2. Sparsity Nova / nova-enclave-capsule
      3. 1.14.3. Enclaver
      4. 1.14.4. Marlin / Oyster
      5. 1.14.5. Anjuna
      6. 1.14.6. Evervault Enclaves
      7. 1.14.7. Kubernetes / EKS

Choosing an AWS Nitro Enclaves Stack in 2026

Choosing an AWS Nitro Enclaves Stack in 2026 : Nova Capsule vs. Enclaver vs. Marlin vs. Anjuna, Plus the Other Options That Matter

AWS Nitro Enclaves has matured into a real design space rather than a single product choice. Once you move beyond the base AWS feature, you quickly discover several distinct categories of solutions:

  • the raw AWS-native path
  • open-source packaging and runtime frameworks
  • managed developer platforms
  • enterprise “lift-and-shift” products
  • decentralized verifiable compute networks

That distinction matters, because most teams are not actually choosing between equivalent Nitro Enclaves products. They are choosing between very different philosophies for how enclave applications should be built, operated, attested, and exposed to the outside world.

This post compares the main options I would seriously consider today:

  • AWS-native Nitro Enclaves
  • Sparsity Nova / nova-enclave-capsule
  • enclaver-io/enclaver
  • Marlin / Oyster
  • Anjuna
  • Evervault Enclaves
  • AWS Nitro Enclaves on Kubernetes / EKS

Start with the constraint that shapes everything

Before comparing products, it is worth remembering what Nitro Enclaves actually is.

A Nitro Enclave is a hardened, isolated VM carved out of a parent EC2 instance. It has no external networking, no persistent storage, and communicates with the parent only over local vsock. That single design choice explains why the ecosystem looks the way it does.

Every Nitro Enclaves “platform” is, in one way or another, trying to solve the same set of problems:

  • how to make enclave apps easier to build
  • how to proxy ingress and egress safely
  • how to handle attestation and measurement validation
  • how to release secrets only to known enclave identities
  • how to preserve developer ergonomics despite the lack of normal networking and storage

So the right question is not “Which Nitro solution has the longest feature list?” The real question is:

Which layer of the Nitro problem do you want to own yourself, and which layer do you want someone else to abstract away?

The evaluation lens

I find these seven dimensions the most useful:

1. How close is it to raw Nitro?

Some teams want maximum control and minimum abstraction. Others want Nitro to disappear behind a developer-friendly platform.

2. How much application change is required?

This is often the dividing line between enterprise products and framework-first solutions.

3. How opinionated is the runtime model?

Some tools are thin wrappers around Nitro; others introduce a full app platform with proxies, APIs, identities, and conventions.

4. How strong is the attestation story?

This includes both technical correctness and how easy it is to consume attestation from clients, services, or even blockchains.

5. How production-ready is the operational story?

Kubernetes, CI/CD, secrets, upgrades, logging, observability, rollout patterns, and support all matter.

6. How open is the stack?

Open source, auditability, self-hosting, and vendor lock-in may matter more than convenience, depending on the use case.

7. What kind of workload is it really for?

Enterprise migration, developer platform, key custody, agent infrastructure, verifiable cloud, and on-chain coprocessors are not the same thing.

1) AWS-native Nitro Enclaves: the most control, the most work

The AWS-native route is the cleanest conceptual baseline. AWS provides the enclave model, Nitro CLI, SDKs, attestation documents, and integration points such as KMS policies bound to enclave measurements.

This path is ideal if you want to own the full architecture yourself. You keep the trust boundary simple. You avoid third-party control planes. You can build exactly the ingress, egress, attestation verification, and secret-release model you want.

But this also means you inherit the hardest parts:

  • parent/enclave split architecture
  • vsock plumbing
  • custom proxying
  • image build and measurement management
  • operational debugging in a constrained environment
  • secret release and attestation verification flows

AWS’s own model makes clear that enclave applications commonly have to be split into a parent-side component and an enclave-side component because of the constrained runtime model.

Best for: security-heavy teams, infrastructure teams, and teams building a platform rather than just shipping one app.

Weakness: time-to-value is the worst of all options.

2) Sparsity Nova / nova-enclave-capsule: a higher-level Nitro application platform

Sparsity’s public repositories and examples make it clear that Nova is not just a packaging tool. It appears to be a broader stack for building enclave applications with a stronger focus on attestation, identity, platform-integrated services, and application templates.

That is a very different ambition from a thin Nitro wrapper.

Nova appears to be solving for teams that want Nitro as the substrate for verifiable applications, not just confidential ones. In practice, that means a stronger opinion around:

  • enclave identity
  • attestation exposure
  • platform-integrated services
  • application templates
  • higher-level runtime conventions
  • potentially on-chain verification and payment patterns

This is a compelling direction if your workload is not merely “run code in an enclave,” but rather:

  • trusted agent runtimes
  • verifiable APIs
  • secure key or wallet operations
  • confidential compute with externally checkable provenance

The tradeoff is equally clear: the more value Nova adds, the more it becomes a platform with its own model of how applications should be built and operated.

That is not a flaw. It is the point. But it means Nova is strongest when you want that opinionated platform layer.

Best for: teams building Nitro-native products, agent infra, verifiable services, or on-chain-adjacent systems.

Weakness: more platform coupling than a minimal toolkit.

3) Enclaver: the cleaner open-source toolkit route

enclaver-io/enclaver sits in a more minimal category. It is closer to a toolkit than a platform.

That is a very useful signal.

Enclaver is appealing precisely because it does less. It is closer to a toolkit than a platform. If Nova is trying to become a full Nitro application stack, Enclaver feels more like a cleaner base layer for teams that want to stay close to the metal while still avoiding some raw Nitro friction.

That makes it attractive for teams that want:

  • open-source transparency
  • lower-level control
  • less ecosystem lock-in
  • a simpler mental model than a full platform

The downside is that you should not expect it to solve every production concern for you. You are likely still taking responsibility for a significant portion of the runtime, operational, and attestation-consumption story.

Best for: technically strong teams that want an open-source Nitro abstraction without buying into a larger platform.

Weakness: thinner product surface and more user-owned integration work.

4) Marlin / Oyster: not just Nitro, but verifiable compute as a network

Marlin is the most conceptually different option in this set.

It is not mainly selling “better enclave packaging.” It is selling a new consumption model for trusted compute.

This matters because many Nitro discussions are really about one of two goals:

  1. “I want a secure place to run part of my existing system.”
  2. “I want the outside world to verify that this computation was performed by the intended enclave.”

Marlin is strongly optimized for the second.

Its approach is especially appealing for workloads closer to:

  • on-chain coprocessors
  • decentralized AI or agent services
  • publicly verifiable compute
  • third-party-rentable confidential execution

If your workload is “internal enterprise app migration,” it may be the wrong mental model altogether.

Best for: Web3, verifiable services, public attestability, decentralized confidential compute.

Weakness: less natural for traditional enterprise migration and internal-only workloads.

5) Anjuna: the enterprise lift-and-shift choice

Anjuna’s positioning is one of the clearest in the category: running applications inside AWS Nitro Enclaves with minimal or no code changes, while also addressing network communication, key management, encryption, and operational concerns.

That tells you almost everything you need to know about the target buyer.

Anjuna is for teams that do not want to redesign their application architecture around Nitro. They want a product that minimizes app changes and maximizes enterprise readiness.

This is especially attractive when the goal is:

  • migrating existing services
  • protecting sensitive code paths
  • adding confidential execution to regulated workloads
  • reducing the specialized enclave engineering burden

The tradeoff is classic enterprise software tradeoff:

  • less open than pure OSS routes
  • more vendor coupling
  • likely higher cost
  • less flexibility for teams that want a bespoke or protocol-native architecture

Best for: enterprises, regulated workloads, existing application migration, teams prioritizing time-to-production over low-level control.

Weakness: less attractive if openness, self-hosting purity, or architectural sovereignty is your top priority.

6) Evervault Enclaves: strong developer experience, but not yet full self-hosting

Evervault Enclaves is an interesting middle ground.

It offers more transparency than a fully closed enterprise product, but it is not equivalent to a fully self-hostable open-source stack. That can still be a very good trade for teams that care more about:

  • fast adoption
  • a polished developer experience
  • managed control plane convenience

than about complete infrastructure sovereignty.

Best for: teams that want Nitro-based secure compute with a smoother managed experience.

Weakness: not the right fit if full self-hosting is a hard requirement today.

7) Kubernetes / EKS: useful deployment substrate, not a full answer

AWS’s Nitro Enclaves Kubernetes device plugin is valuable, especially for teams already invested in EKS or self-managed Kubernetes.

Kubernetes support helps with scheduling and deployment integration. It does not by itself solve:

  • your enclave app architecture
  • secret release design
  • attestation verification interfaces
  • ingress/egress strategy
  • developer ergonomics

So Kubernetes is best thought of as a deployment substrate, not a complete Nitro application platform.

Best for: teams that are already deeply invested in EKS or self-managed Kubernetes.

Weakness: only solves one layer of the overall Nitro problem.

The real segmentation: these products are solving different jobs

A lot of Nitro comparisons go wrong because they compare unlike things. Here is the cleaner framing.

If you want maximum control

Choose AWS-native Nitro Enclaves, or possibly Enclaver if you want a lighter abstraction while staying close to the core model.

If you want an open, higher-level Nitro application platform

Choose Nova. It is explicitly closer to a broader platform for building verifiable enclave applications than just a packaging utility.

If you want enterprise migration with minimal code change

Choose Anjuna. That is the category it is clearly optimized for.

If you want publicly verifiable or decentralized compute

Choose Marlin / Oyster. Its positioning is fundamentally about verifiable compute over decentralized infrastructure, not just confidential hosting.

If you want a managed, developer-friendly enclave experience

Look at Evervault Enclaves, with the caveat that full self-hosting is not there yet.

If you want Kubernetes integration

Use the AWS Nitro Enclaves device plugin, but understand that it complements rather than replaces the rest of the architecture.

My practical take

If I reduce the decision to one line per option, it looks like this:

AWS-native Nitro Enclaves

Use this if you want the cleanest trust boundary and are willing to build the missing platform yourself.

Nova / nova-enclave-capsule

Use this if you want a Nitro-native application platform, especially for verifiable services, trusted agents, or on-chain-adjacent systems.

Enclaver

Use this if you want an open-source toolkit and prefer to keep more of the architecture under your own control.

Marlin / Oyster

Use this if public verifiability and decentralized compute are part of the product, not just an implementation detail.

Anjuna

Use this if your main problem is moving existing enterprise applications into enclaves without a ground-up redesign.

Evervault Enclaves

Use this if you want the easiest secure compute developer experience and can accept a managed-product posture.

The bottom line

The Nitro Enclaves ecosystem is no longer just about “Can this run in an enclave?” That part is the easy part.

The real differentiation is:

  • who owns the platform complexity
  • how much abstraction sits above raw Nitro
  • whether attestability is internal, external, or even on-chain
  • whether your goal is migration, platform building, or networked verifiable compute

That is why Nova, Enclaver, Marlin, and Anjuna should not be seen as four versions of the same product. They are four answers to four different questions.

And that is probably the most useful way to choose.

A simple recommendation matrix

If your team looks like this, start here:

  • Security/infrastructure team that wants full control: AWS-native Nitro Enclaves
  • Open-source team building a Nitro platform or trusted app stack: Nova
  • Engineering-heavy team that wants a leaner open-source toolkit: Enclaver
  • Web3 or publicly verifiable compute team: Marlin / Oyster
  • Enterprise team migrating existing systems: Anjuna
  • Developer-first team that wants a managed enclave product: Evervault

In other words:

Choose the solution that matches the job you are hiring Nitro to do.

If you choose only by feature checklist, you will probably end up with the wrong architecture.

AWS-native Nitro Enclaves

Sparsity Nova / nova-enclave-capsule

Enclaver

Marlin / Oyster

Anjuna

Evervault Enclaves

Kubernetes / EKS