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Pa11y vs OWASP ZAP: Which is Better in 2026?

Choosing between Pa11y and OWASP ZAP comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.

Bottom line: OWASP ZAP is our overall pick for security workflows. Pick Pa11y if you need developer tools.

··Methodology
Editor reviewed0 verified reviews comparedPricing checked Jun 2026

Short on time? Here's the quick answer

We've tested both tools. Here's who should pick what:

Pa11y

Free and open-source tools to help designers and developers make web pages more accessible.

Best for you if:

  • • You need developer tools features specifically
  • • Provides free and open-source web accessibility testing tools.
  • • Offers CLI tools for developers and a dashboard for non-developers.

OWASP ZAP

Open-source web application security scanner

Best for you if:

  • • You need something completely free
  • • You need security features specifically
  • • OWASP ZAP is a free security testing tool for finding web application vulnerabilities
  • • It scans for security issues with automated and manual testing capabilities
At a Glance
Pa11yPa11y
OWASP ZAPOWASP ZAP
Starts at
FreeFree tier available
FreeFree tier available
Best For
Developer ToolsSecurity
Rating
-4.5/5

Choose Pa11y or OWASP ZAP?

Pa11y

Choose Pa11y if

Free and open-source tools to help designers and developers make web pages more accessible.

  • Completely free and open-source
  • Offers multiple tools for different use cases (CLI, Dashboard, Webservice, CI)
  • Helps track accessibility trends over time with graphs
  • Your work is developer tools-shaped, not security-shaped
OWASP ZAP

Choose OWASP ZAP if

Open-source web application security scanner

  • Free security scanner
  • Good for web apps
  • Active community
  • You want a fully free tool (Pa11y requires payment)
  • Your work is security-shaped, not developer tools-shaped
Pa11y logo

Pa11y

Free and open-source tools to help designers and developers make web pages more accessible.

Visit Website
TOP RATED
OWASP ZAP logo

OWASP ZAP

Open-source web application security scanner

Visit Website
FeaturePa11yOWASP ZAP
Pricing ModelFreemiumFree
User RatingNo ratings yet
★4.5/5
22 reviews
Categories
Developer ToolsTesting & QA
SecurityTesting & QA

In-Depth Analysis

Pa11yPa11y

Free and open-source tools to help designers and developers make web pages more accessible.

Strengths

  • +Completely free and open-source
  • +Offers multiple tools for different use cases (CLI, Dashboard, Webservice, CI)
  • +Helps track accessibility trends over time with graphs
  • +Supports integration into continuous integration workflows

Weaknesses

  • -Requires some technical knowledge for CLI and Webservice tools
  • -Dashboard might require setup and hosting by the user

Key features

Command-line interface for one-off accessibility tests (Pa11y)Web dashboard for daily automated accessibility testing (Pa11y Dashboard)Graphs to track accessibility improvements and regressions over timeJSON-based webservice for custom integrations (Pa11y Webservice)Command-line tool for iterating over multiple web pages, suitable for CI (Pa11y CI)
Starts at Free

OWASP ZAPOWASP ZAP

Open-source web application security scanner

Strengths

  • +Free security scanner
  • +Good for web apps
  • +Active community
  • +CI/CD integration
  • +Open source

Weaknesses

  • -Learning curve
  • -False positives
  • -Performance varies
  • -UI dated
  • -Configuration needed

Key features

Web security scannerPenetration testingActive scanningAPI scanningOpen sourceAutomation
Starts at Free

Pricing: Pa11y vs OWASP ZAP

PlanPa11yOWASP ZAP
Tier 1
Free
Pa11y
Free
Free
Tier 2
Free
Pa11y Dashboard
N/A
Tier 3
Free
Pa11y Webservice
N/A
Tier 4
Free
Pa11y CI
N/A

Pricing verified from each vendor's public pricing page. Compare in detail on Pa11y pricing and OWASP ZAP pricing.

Who Should Use What?

On a budget?

OWASP ZAP is free. Pa11y is freemium.

Go with: OWASP ZAP

Want the highest-rated option?

OWASP ZAP is rated 4.5/5. Pa11y has no ratings yet.

Go with: OWASP ZAP

Value user reviews?

Pa11y: no ratings yet. OWASP ZAP: 22 reviews (4.5/5).

Go with: OWASP ZAP

3 Questions to Help You Decide

1

What's your budget?

Pa11y is freemium. OWASP ZAP is free. Go with OWASP ZAP if free matters most.

2

What's your use case?

Pa11y is a developer tools tool. OWASP ZAP is in security. Pick the category that matches your needs.

3

How important are ratings?

OWASP ZAP is rated 4.5/5; Pa11y has no ratings yet.

Key Takeaways

OWASP ZAP

  • Completely free
  • Our pick for this comparison

Pa11y

  • Better fit for developer tools

The Bottom Line

OWASP ZAP is our pick.

Frequently Asked Questions

Is Pa11y or OWASP ZAP better?

OWASP ZAP is rated in our evaluation. Pa11y is freemium and OWASP ZAP is free.

What are Pa11y and OWASP ZAP used for?

Pa11y: Free and open-source tools to help designers and developers make web pages more accessible.. OWASP ZAP: Open-source web application security scanner.

What does Pa11y cost vs OWASP ZAP?

Pa11y is freemium (free tier + paid plans). OWASP ZAP is completely free. Visit their websites for detailed pricing.

Related Comparisons & Resources

Pa11y AlternativesOWASP ZAP AlternativesPa11y Full ReviewOWASP ZAP Full Review
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