The free WordPress SEO plugin with an AI agent built in.
Titles, sitemaps, schema, redirects, robots.txt and llms.txt, social previews and a site health score. Everything a modern SEO plugin should do, with no front-end JavaScript, and a one-click import from the plugin you use today.
Switch without starting over. Import your settings, per-page SEO and redirects from
Everything you need, free
Every feature below works without an account, except the AI ones, which need a free account and credits.
Setup wizard
Two short steps after activation put sensible SEO defaults in place. Skip it, or change anything later.
Setup wizard guideTitles and meta
Templates for every post type, taxonomy and archive, with smart tags and a live Google preview.
Titles and metaXML sitemaps
A sitemap index with per-type sitemaps, image entries and exclusions. It clears its cache when content changes.
XML sitemapsrobots.txt and llms.txt editors
Edit both files from wp-admin. The robots.txt editor warns you about risky rules before they go live.
robots.txt editorRedirection manager
Create 301 and 302 redirects from the dashboard. No .htaccess, no extra redirect plugin.
Redirection managerSchema markup
Article, Product, FAQ, HowTo, Recipe, Event, Local Business, breadcrumbs and more, as server-rendered JSON-LD.
Schema overviewSocial previews
Live Facebook and X card previews in the editor, so you see the share card before you publish.
Social previewsBlock editor, Elementor and Divi
A full panel in the block editor, and clean, builder-agnostic output on Elementor and Divi sites.
Block editor guideSite health score
A grade across seven areas with a fix list ordered by impact, right on the plugin dashboard.
Site health scoreHydrogen AI agent
Ask in plain language. The agent edits metadata, schema, redirects and alt text, and shows you what changed.
Meet Hydrogen AIAI titles, content and alt text
Connect a free account for AI suggestions beside every field, plus bulk alt text for the media library.
Connect your accountUp and running in two minutes
Install
In wp-admin go to Plugins → Add New and search for “Hydrogen SEO”, or download the zip and upload it.
Run the setup wizard
Activate, then let the wizard set your defaults. If you are switching, run the importer from Tools → Import SEO Data.
Connect for AI (optional)
Connect a free hydrogenseo.com account from the API Key screen to turn on AI fixes and Hydrogen AI.
Built to stay out of the way
- No front-end JavaScript. All SEO output is server-rendered.
- Admin assets load only on Hydrogen SEO screens.
- Works the same on the block editor, Elementor and Divi.
- One Save button and an unsaved-changes prompt on every screen.
Hydrogen SEO Pro comes with Pro and Max plans
The Pro add-on extends the free plugin and gets automatic updates. It is included with Pro from $99 a year for 10 sites, and Max from $179 a year for 500 sites.
WordPress plugin questions
Is the Hydrogen SEO plugin free?
Yes. The plugin is free and GPL-licensed on WordPress.org. Every non-AI feature, including sitemaps, schema, redirects, the robots.txt and llms.txt editors and the importer, works with no account at all.
What do I need an account for?
Only the AI features: AI titles and descriptions, AI content tools, AI alt text and the Hydrogen AI agent. A free account includes 500 AI credits and needs no credit card.
Can I switch from Yoast SEO or Rank Math without losing my work?
Yes. Tools → Import SEO Data detects Yoast SEO, Rank Math, All in One SEO, SEOPress, The SEO Framework, Slim SEO, SureRank, and brings your settings, per-page SEO and redirects across. You see a full preview before anything is written, and you can undo it afterwards.
Does it slow down my site?
Hydrogen SEO adds no front-end JavaScript. All SEO output is server-rendered markup, and admin assets load only on Hydrogen SEO screens.
Does it work with Elementor and Divi?
Yes. Titles, meta, canonicals, social cards, schema, sitemaps and redirects are generated by WordPress around whatever your builder renders, so they work the same on any builder. On Divi, leave Divi’s own SEO fields empty so the page does not print two sets of tags.
What is the Pro plugin?
Hydrogen SEO Pro is an add-on to the free plugin. It is included with the Pro plan ($99 a year) and the Max plan ($179 a year), with automatic updates. You download it from your dashboard.
What are the requirements?
WordPress 6.7 or later, PHP 7.4 or later, and an administrator account. The plugin is currently in beta.
Get the free plugin
Install it in two minutes. Connect a free account whenever you want the AI, with 500 credits and no credit card.