Burp Suite vs OWASP ZAP: Which to Use and When

The Short Answer

Use Burp Suite Professional for manual penetration testing engagements. Use OWASP ZAP (now ZAP by Checkmarx) for automated DAST in your CI/CD pipeline. They solve different problems and are not direct substitutes.

If you can only have one and you're doing primarily manual testing: Burp. If you're building a DevSecOps program and need automated scanning: ZAP. If you're a student or on a budget: ZAP is free and capable.

The rest of this post explains why, with specific examples from engagements where each tool's strengths and weaknesses were decisive.

What They Have in Common

Both tools are intercepting proxy-based web application security testing platforms. At the core, they both:

• Intercept and modify HTTP/S traffic between your browser and the target
• Crawl applications to discover endpoints
• Run automated active scans for common vulnerabilities (SQLi, XSS, etc.)
• Maintain a history of all requests and responses
• Support extensions/plugins for additional capabilities

If you've only used one, the other won't feel alien. The workflow is similar. The differences are in depth, polish, and automation integration.

Burp Suite: Where It Wins

The Manual Testing Experience

Burp's UI is optimized for manual penetration testers. The Repeater, Intruder, and Sequencer tools are best-in-class for manual exploitation work.

Repeater is where I spend most of my time in a pentest. Send a request from the proxy history, modify it, resend, compare responses. Burp's diff view, the response rendering, and the request/response layout are all better than ZAP's equivalent.

Intruder for fuzzing and brute-force attacks is extremely flexible. Yes, the free Community edition rate-limits Intruder — but if you're doing professional engagements, you should be on Pro.

Collaborator (Pro only) is the single feature that justifies the Burp Pro license for pentesters. It provides an out-of-band interaction server for detecting blind vulnerabilities — blind XSS, blind SSRF, blind command injection. These are vulnerabilities that don't reflect output back to the attacker, so they're invisible to in-band scanners. Collaborator gives you a unique DNS/HTTP/SMTP endpoint; if the target server reaches out to it, you know exploitation succeeded.

I've found critical blind SSRF vulnerabilities using Collaborator that would have been completely invisible to ZAP or any other automated tool.

The Active Scanner

Burp Pro's active scanner is more accurate and less noisy than ZAP's in my experience. It has better handling of:

• Complex authentication flows (multi-step login, OAuth, MFA)
• Session management and token handling
• Modern JavaScript-heavy SPAs

On a recent engagement against a React SPA with a complex JWT-based auth flow, Burp's scanner maintained session state throughout the crawl and scan. ZAP lost the session midway and started producing unauthenticated scan results — which look very different from authenticated results.

Cost

Burp Suite Professional: ~$449/year per user. There's a Community (free) edition, but it lacks the active scanner, Collaborator, and has rate-limited Intruder. For professional pentesting, the Pro license is not optional.

OWASP ZAP / ZAP by Checkmarx: Where It Wins

CI/CD Integration

This is ZAP's strongest use case and where I reach for it over Burp every time. ZAP was designed with automation in mind. It has:

• A fully-featured REST API and daemon mode
• Official Docker images maintained by the project
• A dedicated GitHub Action (zaproxy/action-full-scan)
• Automation Framework — a YAML-based configuration for scripting complex scan workflows

Here's the GitHub Actions workflow I use for baseline DAST scanning:

name: DAST Scan

on:
  schedule:
    - cron: "0 2 * * 1" # Weekly on Monday at 2am
  workflow_dispatch:

jobs:
  zap-scan:
    runs-on: ubuntu-latest
    steps:
      - name: ZAP Full Scan
        uses: zaproxy/action-full-scan@v0.10.0
        with:
          target: "https://staging.yourdomain.com"
          rules_file_name: ".zap/rules.tsv"
          cmd_options: "-a"

The rules.tsv file lets you configure which alert types to treat as failures versus warnings:

10202	WARN	# Absence of Anti-CSRF Tokens
10038	FAIL	# Content Security Policy Header Not Set
10020	FAIL	# Missing Anti-clickjacking Header

Running this against a staging environment weekly gives you continuous DAST coverage without manual intervention. Burp has no equivalent automated workflow story.

Cost

Free and open source. For teams running multiple scan targets, ZAP's economics are impossible to beat.

Scripting and Extensibility

ZAP's scripting engine supports JavaScript, Python, Ruby, and Groovy. The add-on marketplace has >50 community extensions. For building custom scan logic — like testing business logic flows that a generic scanner won't understand — ZAP's scriptable scan rules are powerful.

Head-to-Head on Specific Tasks

My Actual Setup

In practice, I use both on every engagement:

Manual pentest phase: Burp Pro. All traffic proxied through Burp. I use Burp Scanner as a first pass to identify low-hanging fruit, then manually investigate findings and look for logic flaws the scanner misses.

Pipeline integration: ZAP in CI against the staging environment. Configured with a custom rules file to fail the build on HIGH findings, warn on MEDIUM. Results posted as PR comments via the GitHub Action.

Reporting: Burp's reporting export is better for pentest reports. ZAP generates HTML/XML/JSON that integrates better into automated pipelines.

The tools are complementary. A mature AppSec program should be running both.

One Thing Neither Tool Does Well

Neither Burp nor ZAP handles modern SPAs well out of the box. Both struggle to crawl Angular/React/Vue applications that load content dynamically — the crawler sees the initial HTML but misses routes that are rendered client-side.

The workaround:

• Burp: Use the browser-based crawl (Burp's embedded Chromium) instead of the traditional spider, and manually browse the application while the crawler observes
• ZAP: Use the Ajax Spider add-on, which drives a real browser, instead of the traditional spider

Even with these workarounds, automated crawl coverage on a heavy SPA is typically 40-60% of the actual attack surface. The rest requires manual exploration.

Getting Started Recommendation

If you're new to web application security testing:

1. Start with ZAP — it's free, the documentation is solid, and the OWASP community is active
2. Run ZAP against OWASP WebGoat or DVWA to learn what findings look like
3. Once you're doing professional engagements, add Burp Pro to your toolkit
4. Use both in your DevSecOps program: ZAP automated, Burp manual

The worst thing you can do is pick one and treat it as a complete solution. Automated DAST finds the obvious; manual testing finds what matters.