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Developer Tools · head to head

Keil MDK vs Legit Security

Keil MDK logo

Keil MDK

Developer Tools

Microcontroller Development Kit for Arm-based devices

From
Free
Free plan
Yes
Full reviewWebsite
Legit Security logo

Legit Security

Cybersecurity

AI-native ASPM platform securing AI-generated code before deployment

From
On request
Free plan
No
Full reviewWebsite

The short version

  • Only Keil MDK has a free tier, so it costs nothing to try first.
  • Each has a real cost: Keil MDK pricing for Essential and Professional subscriptions not disclosed on primary site; Legit Security pricing requires contacting sales, making cost comparison difficult
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Keil MDK and Legit Security actually diverge.

Attributes where Keil MDK and Legit Security differ
AttributeKeil MDKLegit Security
Starting priceFreeOn request
Pricing modelfreemiumContact sales for custom pricing
Free tierYesNo
PlatformsWebWeb, IDE, CI/CD
CategoryDeveloper ToolsCybersecurity

Identical on both: 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 Keil MDK

Nothing recorded that Legit Security does not also cover.

Only in Legit Security

  • VibeGuard AI code scanning
  • Unified vulnerability remediation
  • Code Security (SAST/SCA)
  • Secrets detection and prevention
  • Software Supply Chain Security
  • Code change detection
  • AI-powered remediation
  • Risk scoring

What people use each for

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

Keil MDK

  • Embedded software developmentnot Legit Security
  • ARM microcontroller programmingnot Legit Security
  • Professional development environmentsnot Legit Security

Legit Security

  • Securing AI-generated code from GitHub Copilot and IDE assistantsnot Keil MDK
  • Consolidating vulnerability findings from multiple AppSec toolsnot Keil MDK
  • Preventing credential leaks across development workspacesnot Keil MDK
  • Automating remediation workflows with AI-powered suggestionsnot Keil MDK
  • Compliance automation with SBOM generation and enforcementnot Keil MDK

Where each one falls short

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

Keil MDK

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

Legit Security

  • Pricing requires contacting sales, making cost comparison difficult
  • No published pricing tiers or free tier available
  • Requires integration with existing SAST and SCA tools for full capability
  • Focused primarily on code security within development lifecycle
  • Newer entrant with less market presence than established competitors

Pricing, plan by plan

Keil MDK

Free

No published plan breakdown. See the Keil MDK review.

Legit Security

On request

No published plan breakdown. See the Legit Security review.

Which should you pick?

Choose Keil MDK if

  • You want to start without paying.
Keil MDK review

Choose Legit Security if

  • You need vibeguard ai code scanning.
  • You work on Web, IDE, CI/CD.
  • You also want unified vulnerability remediation.
Legit Security review

Questions people ask

Is Keil MDK or Legit Security better?
Neither clearly leads. Keil MDK starts at Free and Legit Security at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Keil MDK or Legit Security?
Keil MDK has a free tier; the other does not. Paid plans start at Free for Keil MDK and On request for Legit Security.
Does Keil MDK or Legit Security run on more platforms?
Keil MDK runs on Web. Legit Security runs on Web, IDE, CI/CD.
Can I use Keil MDK for free?
Yes. Keil MDK has a free tier, so you can try it without paying. Legit Security starts at On request.
What is Keil MDK best used for?
Keil MDK is most often used for embedded software development, arm microcontroller programming, professional development environments. Of those, embedded software development and arm microcontroller programming are not what Legit Security is typically brought in for.
What can Keil MDK do that Legit Security cannot?
Legit Security covers VibeGuard AI code scanning, Unified vulnerability remediation, Code Security (SAST/SCA), Secrets detection and prevention.

Answered from the vendors’ own pages

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
Legit Security: What is VibeGuard and how does it work?

VibeGuard is Legit Security's core feature that scans AI-generated code directly within IDEs like GitHub Copilot and Cursor, identifying vulnerabilities before code leaves the developer's editor.

Source
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
Legit Security: What AI code assistants does Legit Security support?

Legit Security integrates with GitHub Copilot, Cursor, and Claude to scan AI-generated code for vulnerabilities.

Source
Legit Security: How does Legit Security's AI remediation feature work?

The platform uses AI to suggest specific code fixes for identified vulnerabilities and can automatically create tickets in Jira with full context for developers to review and apply.

Source
Legit Security: Does Legit Security support compliance reporting?

Yes, Legit Security automates compliance automation with SBOM generation and can generate compliance reports for security and regulatory requirements.

Source
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