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OWASP ZAP

Open Source

Open-source web application security scanner — DAST scanning, intercepting proxy, and fuzzing.

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Pricing

Free / Open source

Type

Automation

Languages

Java

// VERDICT

Reach for OWASP ZAP when you want a free, automatable DAST scanner to find runtime vulnerabilities in a web app or API, including in CI. Skip it when you need static/dependency analysis or Burp's deeper manual pentest tooling.

Best for

Free, open-source dynamic application security testing (DAST) - scanning a running web app or API for vulnerabilities, with strong automation/CI support.

Avoid when

You want static code analysis (SAST), dependency scanning, or the depth of a commercial pentest tool's manual tooling.

CI/CD fit

ZAP CLI / Docker · GitHub Actions · GitLab CI · Jenkins

Languages

Java

Team fit

AppSec teams · SDETs adding security · DevSecOps · QA on a budget

Setup

Medium

Maintenance

Medium

Learning

Intermediate

Licence

Free / Open source

// BEST FOR

  • Scanning a running web app or API for runtime vulnerabilities (DAST)
  • Free, open-source security testing with no licensing barrier
  • Automating baseline scans in CI via the ZAP Docker image/CLI
  • Both passive scanning and active attack-style probing
  • A starting point for teams new to security testing
  • Spidering an app and testing the discovered surface

// AVOID WHEN

  • You want static source-code analysis (SAST - SonarQube/Checkmarx)
  • You need dependency/SCA scanning (Snyk)
  • You want the depth of Burp's manual pentest tooling
  • The target isn't a running, reachable app/API
  • You need polished commercial support and reporting
  • Deep, specialist manual testing is the priority

// QUICK START

# Baseline scan against a test target you are authorized to test:
docker run -t ghcr.io/zaproxy/zaproxy zap-baseline.py -t https://test.example.com

// ALTERNATIVES TO CONSIDER

ToolChoose it when
Burp SuiteYou want deeper manual pentest tooling and a polished pro edition.
PyntYou want API security scans driven by your existing functional tests.
SnykYou want to scan dependencies and code, not a running app.

// FEATURES

  • Automated active and passive scanning
  • Intercepting proxy with request/response editing
  • Fuzzer and forced browse
  • Authentication scripts for protected apps
  • REST API and Docker images for CI
  • Add-on marketplace for extended capabilities

// PROS

  • Free, open-source, OWASP-flagship project
  • Solid feature parity with paid scanners for most use cases
  • Strong CI/CD integration via Docker and APIs
  • Active community and regular releases

// CONS

  • GUI feels dated
  • Authentication setup for SPAs requires scripting
  • Java install requirement
  • False-positive rate higher than premium scanners

// EXAMPLE QA WORKFLOW

  1. Run ZAP (desktop for interactive, Docker/CLI for automation)

  2. Point it at a running target you're authorized to test

  3. Configure scope and authentication

  4. Run a passive baseline, then active scanning as appropriate

  5. Triage findings - separate false positives from real issues

  6. Wire baseline scans into CI against a test environment