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Head-to-head · Application Security Testing

OWASP ZAP vs Klocwork

  • Updated Oct 2026
  • Both researched from official sources
  • 2 checks side by side
Higher score OWASP ZAP #2 in Application Security Testing 9.1/10 Free plan Free plan✓ 1 of 2 features Visit OWASP ZAP
Klocwork #6 in Application Security Testing 8.7/10 Pricing on request ✓ 0 of 2 features Visit Klocwork

OWASP ZAP leads on 0 checks, Klocwork on 0, and 2 are even. Who comes out ahead on the 2 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreOWASP ZAP · 9.1/10
  • Free planonly OWASP ZAP
  • Most featuresOWASP ZAP · 1 of 2

OWASP ZAP scores higher on our rubric for application security testing: 9.1 against 8.7 out of 10; our editors rank them #2 and #6.

OWASP ZAP is the better fit for teams wanting free, flexible web and API testing. Klocwork is the better fit for mature teams doing code-focused SAST.

  • OWASP ZAP fits best

    Teams wanting free, flexible web and API testing

  • Klocwork fits best

    Mature teams doing code-focused SAST

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Side by side

Feature OWASP ZAP 9.1/10 Visit ↗ Klocwork 8.7/10 Visit ↗
At a glance
Editor score 9.1 8.7
Ranking #2 in Application Security Testing #6 in Application Security Testing
Best for Teams wanting free, flexible web and API testing Mature teams doing code-focused SAST
Pricing model Free Paid
Starting price Free plan Pricing on request
Free plan ✓ (best) Not checked yet
Free trial — —
Deployment Self-hosted, Desktop, Browser extension Self-hosted, Cloud
Platforms Windows, macOS, Linux Web, Windows, Linux
Support Community, Docs Email, Phone, Tickets, Community, Docs
Integrations 2 integrations 10 integrations
Built for Solo, Small business, Mid-market, Enterprise Mid-market, Enterprise
Features OWASP ZAP 1/2 · Klocwork 0/2
SCA included Not checked yet Not checked yet
API testing ✓ (best) Not checked yet
Specs
Testing methods Not checked yet Not checked yet
Languages supported Not checked yet Not checked yet
CI/CD integrations Not checked yet Not checked yet
Deployment options Not checked yet Not checked yet
Our review
Pros
  • Combines active and passive scans with traditional and browser-based spiders
  • Supports authenticated scans and OpenAPI, Swagger, and GraphQL API scanning
  • Offers a REST API, YAML-based automation, Docker scans, and an add-on marketplace
  • Differential analysis focuses reviews on changed code.
  • Custom checkers can be created graphically.
  • IDE plugins and CI/CD integrations support established workflows.
Cons
  • Focuses on web and API DAST rather than the wider AppSec lifecycle
  • Self-hosted deployment means teams run ZAP in their own environment
  • Support channels are community and documentation
  • Its focus is source-code analysis, not a multi-method AppSec suite.
  • Pricing is handled through contact with sales.
  • Support is not available 24/7.
Our verdict

OWASP ZAP is a free, open-source penetration-testing tool for finding vulnerabilities in web applications. Developers, testers, and security specialists can use it for web and API testing, whether working through its desktop application,…

Read the review →

Klocwork is Perforce Software’s static application security testing and static code analysis tool for development and security teams working on complex codebases. It analyzes source code for security vulnerabilities, reliability defects,…

Read the review →
  1. OWASP ZAPApplication Security Testing 9.1Free plan
  2. KlocworkApplication Security Testing 8.7Pricing on request

Strengths and trade-offs

  • OWASP ZAP — where it wins

    • Combines active and passive scans with traditional and browser-based spiders
    • Supports authenticated scans and OpenAPI, Swagger, and GraphQL API scanning
    • Offers a REST API, YAML-based automation, Docker scans, and an add-on marketplace

    Where it doesn't

    • Focuses on web and API DAST rather than the wider AppSec lifecycle
    • Self-hosted deployment means teams run ZAP in their own environment
    • Support channels are community and documentation

  • Klocwork — where it wins

    • Differential analysis focuses reviews on changed code.
    • Custom checkers can be created graphically.
    • IDE plugins and CI/CD integrations support established workflows.

    Where it doesn't

    • Its focus is source-code analysis, not a multi-method AppSec suite.
    • Pricing is handled through contact with sales.
    • Support is not available 24/7.

More comparisons

All application security testing comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update