# Pa11y vs Siteimprove

| Attribute | Pa11y | Siteimprove |
|---|---|---|
| **Vioscale score** | 44.9 (30% (low)) | 13.3 (15% (low)) |
| activity.commits_last_30d | 3 | - |
| adoption.dependent_repos | 1,668 | - |
| adoption.github_stars | 4,490 | - |
| deployment.options | `{"cloud":true,"self_hosted":true}` | `{"cloud":true}` |
| description.long | 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. | Siteimprove is a SaaS platform that helps teams ensure digital content meets accessibility standards, performs well in search engines, and maintains consistent quality. AI agents provide real-time guidance and automation throughout content creation and website management workflows. |
| features.capabilities | `{"open_source":true,"scan_method":"automated-rules-engine","ci_cd_integration":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,"web":true,"linux":true}` | `{"web":true}` |
| pricing | `{"type":"open_source","summary":"Free and open source","freeTier":true,"sourceUrl":"https://pa11y.org/","retrievedAt":"2026-08-21T13:21:08.576Z"}` | `{"type":"quote","summary":"Custom enterprise pricing — contact sales for detailed quote","freeTier":false,"sourceUrl":"https://www.siteimprove.com/de/pricing/","retrievedAt":"2026-08-18T12:20:17.119Z"}` |
| pricing.free_tier | yes | no |
| pricing.model | open_source | quote |
| pricing.price_level | free | unknown |
| pricing.transparent | yes | no |
| release.cadence_days | 131 | - |
| release.history | `[{"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.scorecard | 7.3 | - |
| 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 | - |
| Wcag level | - | - |
| 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: Vioscale. Generated 2026-09-01T16:34:04.110Z. "-" = undocumented, not absent.*