# Pa11y vs Siteimprove

| Attribute | Pa11y | Siteimprove |
|---|---|---|
| **vioscaleAI score** | 47 (30% (low)) | 42.7 (19% (low)) |
| activity.commits_last_30d | 4 | - |
| adoption.dependent_repos | 1,668 | - |
| adoption.github_stars | 4,577 | - |
| content.faq | `[{"answer":"A suite of free and open-source tools for identifying and tracking accessibility issues on websites. Provides both automated testing via a web dashboard and command-line utilities for developers. It is indexed under Accessibility Testing.","source":"https://pa11y.org/","question":"What is Pa11y?","confidence":0.6},{"answer":"Pa11y is open source, so it can be self-hosted and used at no licence cost. It is released under the LGPL-3.0 licence. Pricing changes often, so verify at source before relying on it.","source":"https://pa11y.org/","question":"Is Pa11y free to use?","confidence":0.6},{"answer":"Pa11y supports the web, Linux and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://pa11y.org/","question":"What platforms does Pa11y support?","confidence":0.6},{"answer":"Yes. Pa11y can be deployed cloud / SaaS and self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://pa11y.org/","question":"Can Pa11y be self-hosted?","confidence":0.6},{"answer":"Yes. Pa11y is published under the LGPL-3.0 licence, a copyleft licence, so check its terms before embedding it in a closed-source product. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://github.com/pa11y/pa11y","question":"Is Pa11y open source?","confidence":0.95}]` | `[{"answer":"A platform featuring AI agents that assist teams with accessibility compliance, search visibility optimization, and content strategy across web, mobile, social, documents, and applications. It is indexed under Accessibility Testing.","source":"https://www.siteimprove.com/","question":"What is Siteimprove?","confidence":0.6},{"answer":"Siteimprove does not publish its prices. Pricing is quoted on request, so the figure depends on your seat count and requirements. We record this as a pricing-transparency signal rather than guessing a number. Pricing changes often, so verify at source before relying on it.","source":"https://www.siteimprove.com/de/pricing/","question":"How much does Siteimprove cost?","confidence":0.6},{"answer":"We have confirmed browser-based access to Siteimprove. That is the extent of what we could verify from public sources, so it may well offer desktop or mobile clients we have not indexed.","source":"https://www.siteimprove.com/de/pricing/","question":"What platforms does Siteimprove support?","confidence":0.6},{"answer":"We have only confirmed a cloud / SaaS deployment for Siteimprove, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.","source":"https://www.siteimprove.com/de/pricing/","question":"Can Siteimprove be self-hosted?","confidence":0.6},{"answer":"We have confirmed 25 integrations for Siteimprove, including Adobe Experience Manager, Optimizely, WordPress, Drupal, TYPO3, Sitecore, Google Analytics and Kentico Xperience, plus 17 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://www.siteimprove.com/de/pricing/","question":"What does Siteimprove integrate with?","confidence":0.6}]` |
| deployment.options | `{"self_hosted":true}` | `{"cloud":true}` |
| description.long | A command-line and Node.js-based utility that performs automated accessibility testing on web pages to identify compliance issues against WCAG standards. | An integrated platform that helps organizations ensure content compliance and performance by combining accessibility testing, search optimization, content strategy tools, and analytics through continuous AI-powered monitoring and automated remediation guidance. |
| features.capabilities | `{"wcag_level":"AAA","open_source":true,"scan_method":"automated-rules-engine","ci_cd_integration":true,"continuous_monitoring":true}` | `{"cms_plugins":true,"scan_method":"automated-rules-engine","browser_extension":true,"document_pdf_testing":true,"manual_audit_service":true,"continuous_monitoring":true}` |
| integrations.count | - | 25 |
| integrations.list | - | `[{"name":"Adobe Experience Manager"},{"name":"Optimizely"},{"name":"WordPress"},{"name":"Drupal"},{"name":"TYPO3"},{"name":"Sitecore"},{"name":"Google Analytics"},{"name":"Kentico Xperience"},{"name":"Umbraco"},{"name":"Magnolia CMS"},{"name":"Jahia"},{"name":"CoreMedia"},{"name":"Tridion"},{"name":"Cascade"},{"name":"FirstSpirit"},{"name":"Enonic"},{"name":"Plone"},{"name":"SiteVision"},{"name":"Sitefinity"},{"name":"govAccess"},{"name":"Sitebox"},{"name":"Percussion"},{"name":"IPROX-CMS"},{"name":"i:Create"},{"name":"LRS Antilles"}]` |
| language.primary | JavaScript | - |
| license.spdx | LGPL-3.0 | - |
| market.availability | - | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"cli":true,"mac":true,"linux":true,"windows":true}` | `{"web":true}` |
| pricing | `{"type":"open_source","sourceUrl":"https://pa11y.org/","retrievedAt":"2026-09-13T19:32:37.685Z"}` | `{"type":"quote","sourceUrl":"https://www.siteimprove.com/de/pricing/","retrievedAt":"2026-09-24T12:06:32.606Z"}` |
| pricing.free_tier | yes | no |
| pricing.model | open_source | quote |
| pricing.price_level | free | unknown |
| pricing.transparent | yes | no |
| release.cadence_days | 135 | - |
| release.history | `[{"url":"https://github.com/pa11y/pa11y/releases/tag/10.0.0","date":"2026-08-28T14:08:34Z","type":"stable","version":"10.0.0"},{"url":"https://github.com/pa11y/pa11y/releases/tag/9.1.1","date":"2026-02-26T14:45:52Z","type":"stable","version":"9.1.1"},{"url":"https://github.com/pa11y/pa11y/releases/tag/9.1.0","date":"2026-02-03T18:13:04Z","type":"stable","version":"9.1.0"},{"url":"https://github.com/pa11y/pa11y/releases/tag/9.0.1","date":"2025-09-25T13:56:19Z","type":"stable","version":"9.0.1"},{"url":"https://github.com/pa11y/pa11y/releases/tag/9.0.0","date":"2025-05-09T01:30:35Z","type":"stable","version":"9.0.0"},{"url":"https://github.com/pa11y/pa11y/releases/tag/8.0.0","date":"2024-03-27T03:22:52Z","type":"stable","version":"8.0.0"},{"url":"https://github.com/pa11y/pa11y/releases/tag/7.0.0","date":"2024-01-16T06:42:20Z","type":"stable","version":"7.0.0"}]` | - |
| security.certifications | - | `[{"name":"FedRAMP Ready","status":"active"}]` |
| security.fedramp | - | yes |
| security.scorecard | 6.9 | - |
| security.trust_center | - | https://www.siteimprove.com/de/glossary/wcag-compliance-checker/ |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=pa11y&per_page=100","last_12m":0,"max_severity":null}` | - |

## Capabilities (Accessibility Testing)

| Capability | Pa11y | Siteimprove |
|---|:--:|:--:|
| **Capabilities** |  |  |
| Scan method | Automated rules engine | Automated rules engine |
| Wcag level | AAA | - |
| Ci cd integration | ✓ | - |
| Browser extension | - | ✓ |
| Design stage plugin | - | - |
| CMS plugins | - | ✓ |
| Continuous monitoring | ✓ | ✓ |
| Vpat acr generation | - | - |
| Manual audit service | - | ✓ |
| Overlay widget | - | - |
| Document PDF testing | - | ✓ |
| Open source | ✓ | - |

*Source: vioscaleAI. Generated 2026-10-16T19:19:13.416Z. "-" = undocumented, not absent.*