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Cybersecurity · head to head

HashiCorp Boundary vs Keil MDK

HashiCorp Boundary logo

HashiCorp Boundary

Cybersecurity

Identity-aware session broker for infrastructure access without distributing credentials

From
Free
Free plan
Yes
Full reviewWebsite
Keil MDK logo

Keil MDK

Developer Tools

Microcontroller Development Kit for Arm-based devices

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Each has a real cost: HashiCorp Boundary hashiCorp was acquired by IBM in February 2025 and Enterprise licensing now runs through IBM Passport Advantage; IBM has already retired HCP Vault Secrets, so Boundary's roadmap depends on IBM portfolio decisions rather than HashiCorp's own product strategy.; Keil MDK pricing for Essential and Professional subscriptions not disclosed on primary site
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which HashiCorp Boundary and Keil MDK actually diverge.

Attributes where HashiCorp Boundary and Keil MDK differ
AttributeHashiCorp BoundaryKeil MDK
Pricing modelOpen source, no licence feefreemium
PlatformsLinux, macOS, Windows, WebWeb
CategoryCybersecurityDeveloper Tools

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in HashiCorp Boundary

  • Identity-based access
  • Just-in-time credentials
  • Dynamic host catalogues
  • Session recording
  • Transparent sessions
  • Multi-hop workers
  • Audit logging
  • Terraform provider

Only in Keil MDK

Nothing recorded that HashiCorp Boundary does not also cover.

What people use each for

The jobs each tool is most often brought in to do.

HashiCorp Boundary

  • A platform team replacing shared SSH keys and a bastion host so that leavers lose access the moment they are removed from the identity providernot Keil MDK
  • Granting contractors time-boxed database access without ever issuing them a credential they could keepnot Keil MDK
  • An estate where autoscaling replaces hosts continuously and a static access list is always out of datenot Keil MDK
  • Producing session recordings as evidence for an audit that requires proof of who touched production and what they rannot Keil MDK

Keil MDK

  • Embedded software developmentnot HashiCorp Boundary
  • ARM microcontroller programmingnot HashiCorp Boundary
  • Professional development environmentsnot HashiCorp Boundary

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

HashiCorp Boundary

  • HashiCorp was acquired by IBM in February 2025 and Enterprise licensing now runs through IBM Passport Advantage; IBM has already retired HCP Vault Secrets, so Boundary's roadmap depends on IBM portfolio decisions rather than HashiCorp's own product strategy.
  • Enterprise pricing is not published anywhere, and the features most organisations actually need for compliance, notably session recording, are Enterprise only, so the free community edition is rarely the version you end up buying.
  • It solves access to infrastructure, not to applications; browser-based internal tools, SaaS admin consoles and APIs need a separate control, so Boundary is one component of a zero-trust programme rather than the whole thing.
  • Running it yourself means operating controllers, worker nodes and a Postgres database in a highly available configuration, and if that control plane is down nobody can reach production, which makes it a new critical dependency.
  • It is materially easier to adopt if you already run Vault and Terraform; teams without that ecosystem face a steeper learning curve than a device-based mesh product like Tailscale, for a similar access outcome.

Keil MDK

  • Pricing for Essential and Professional subscriptions not disclosed on primary site
  • Customers must contact Arm Developer Tools store for subscription rates

Pricing, plan by plan

HashiCorp Boundary

Free
  • Boundary Community EditionFree
    • MPL 2.0 open source
    • Self-hosted controllers and workers
    • Identity-based target access
  • Boundary Enterprise$undefined/year
    • Session recording and playback
    • Multi-hop and transparent sessions
    • Multi-tenancy via scopes

Keil MDK

Free

No published plan breakdown. See the Keil MDK review.

Which should you pick?

Choose HashiCorp Boundary if

  • You need identity-based access.
  • You want to start without paying.
  • You work on Linux, macOS, Windows, Web.
  • You also want just-in-time credentials.
HashiCorp Boundary review

Choose Keil MDK if

  • You want to start without paying.
Keil MDK review

Questions people ask

Is HashiCorp Boundary or Keil MDK better?
Neither clearly leads. HashiCorp Boundary starts at Free and Keil MDK at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, HashiCorp Boundary or Keil MDK?
HashiCorp Boundary starts at Free and Keil MDK at Free.
Does HashiCorp Boundary or Keil MDK run on more platforms?
HashiCorp Boundary runs on Linux, macOS, Windows, Web. Keil MDK runs on Web.
Can I use HashiCorp Boundary for free?
Both have a free tier, so you can try either at no cost before committing.
What is HashiCorp Boundary best used for?
HashiCorp Boundary is most often used for a platform team replacing shared ssh keys and a bastion host so that leavers lose access the moment they are removed from the identity provider, granting contractors time-boxed database access without ever issuing them a credential they could keep, an estate where autoscaling replaces hosts continuously and a static access list is always out of date, producing session recordings as evidence for an audit that requires proof of who touched production and what they ran. Of those, a platform team replacing shared ssh keys and a bastion host so that leavers lose access the moment they are removed from the identity provider and granting contractors time-boxed database access without ever issuing them a credential they could keep are not what Keil MDK is typically brought in for.
What can HashiCorp Boundary do that Keil MDK cannot?
HashiCorp Boundary covers Identity-based access, Just-in-time credentials, Dynamic host catalogues, Session recording.

Answered from the vendors’ own pages

HashiCorp Boundary: Is Boundary open source?

The community edition is, under MPL 2.0. Boundary Enterprise is commercial and is now sold through IBM Passport Advantage.

Keil MDK: Does Keil MDK have a free version?

Yes, Keil MDK Community Edition is free for non-commercial projects. Essential and Professional editions are available as monthly or annual subscriptions.

Source
HashiCorp Boundary: Does it replace a VPN?

For infrastructure access, largely yes. It grants a session to a specific target rather than putting the user on a network, but it does not cover browser-based internal applications.

Keil MDK: How much do Keil MDK paid editions cost?

Specific pricing for Essential and Professional editions is not published on the main site. Rates are available from the Arm Developer Tools store or by contacting Arm sales.

Source
HashiCorp Boundary: What does Boundary Enterprise cost?

HashiCorp does not publish Boundary pricing. It is quoted, and since the IBM acquisition it is transacted on IBM licensing paper.

HashiCorp Boundary: Do I need Vault to use it?

No, but the just-in-time credential brokering that makes Boundary worthwhile depends on Vault or an equivalent secrets store.

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