SEO Plugins & Apps
Open-source SEO plugins and apps
12 of the 79 SEO plugins and apps in this directory are open source, according to their own sites.
All of them are free or have a free plan.
Listings checked up to Oct 23, 2026 · Where the facts come from
| Tool | Price | Free plan | Runs on |
|---|---|---|---|
| RedirectionFree WordPress plugin for managing 301 redirects and 404 errors | Free | Free | Web |
| Schema & Structured Data for WP & AMPWordPress schema plugin with 35+ types and AMP support | Free plan · from $99/yr | Yes | Web |
| WPSSO CoreWordPress plugin for Schema markup and social sharing meta tags | Free plan · from $49 one-time | Yes | Web |
| Site Kit by GoogleGoogle's free WordPress plugin for Search Console and Analytics stats | Free | Free | Web |
| AI SEO CopilotFree, open-source on-page SEO checker inside the Webflow Designer | Free | Free | Web |
| XML Sitemap Generator for GoogleFree WordPress plugin that builds and updates XML and HTML sitemaps | Free | Free | Web |
| 301 Redirects - Redirect ManagerWordPress plugin for 301, 302 and 307 redirects with a 404 error log | Free plan · from $9.99/mo | Yes | Web |
| Permalink ManagerWordPress plugin for editing full URLs and permalink formats | Free plan · from €49 one-time | Yes | Web |
| Media File RenamerWordPress plugin that renames media files to descriptive names | Free plan · from $39/yr | Yes | Web |
| 404 to 301Free WordPress redirect manager with detailed 404 error logs | Free | Free | Web |
| Simple 301 Redirects by BetterLinksFree, minimal WordPress plugin for 301 redirects and wildcards | Free | Free | Web |
| Schema - All In One Schema Rich SnippetsFree WordPress plugin for adding schema to posts one at a time | Free | Free | Web |
Common questions
Which SEO plugins and apps are open source?
12 of the 79 SEO plugins and apps in this directory are open source, according to their own sites. They are Redirection, Schema & Structured Data for WP & AMP, WPSSO Core, Site Kit by Google, AI SEO Copilot, XML Sitemap Generator for Google, 301 Redirects - Redirect Manager, Permalink Manager, Media File Renamer, 404 to 301, Simple 301 Redirects by BetterLinks and Schema - All In One Schema Rich Snippets.
When was this checked?
Every listing on this page was checked on Oct 23, 2026, against the pages it cites. Vendors change prices and plans without notice, so confirm on their site before you buy.
This page is built from the listings. A tool is here because its listing says so, and each listing names the pages it was read from.