Find what costs you traffic
27 checks on every page, ranked by impact, so the first fix is the one that matters.
Site health84
CriticalMissing meta description
Warning12 images without alt text
ImproveNo FAQ answers for AI engines
New Import from Yoast, Rank Math and 5 more in one click
Rank on Google. Get cited by AI.
Hydrogen SEO audits your site, ranks what is costing you traffic, and writes the fix — for Google, ChatGPT and Perplexity. Paste your URL and see your score in seconds.
Free website analysisNo credit card requiredResults in under a minute
Free plan forever · Pro from $8.25/mo · See pricing
Interactive demo — click around
Overview
Synced with WordPressSite health
Last 15 weeks84/100 +23 in 90 days
84 Oct 7
84Health
2 critical3 warnings
Pages audited
142
+18Issues fixed
63
+11 this weekAI citations
12
+5Rich results
38
+9Top issues by traffic impact
CriticalMissing meta description
CriticalDuplicate title tag on 4 pages
Warning12 images without alt text
Switch in one click — imports your settings from
Yoast SEORank MathAll in One SEOSEOPressThe SEO FrameworkSlim SEOSureRank
How it works
From URL to fixed in three steps
No tags to install, no crawl budget to wait for, no spreadsheet to decode.
1
Paste your URL
Or connect WordPress with the free plugin. The first audit runs in under a minute.
2
Get a ranked list of fixes
Every issue is scored by impact, so you always know what to do first — and what can wait.
3
Apply the AI fix
Generated titles, meta, alt text and schema. Apply in WordPress with one click, or copy it anywhere.
Everything in one place
One toolkit instead of five subscriptions
Every SEO tool is on every plan, including Free. AI visibility tracking comes with Pro and Max.
AI writes the fix
Titles, meta descriptions and alt text written for your page. Review, then apply in WordPress.
Meta descriptionGenerate
Before: (empty)
After: Naturally leavened sourdough baked fresh every morning in Portland. Order for pickup by 7am.
Applied to WordPress
Get cited by AI answers
See whether ChatGPT, Perplexity, Gemini and Claude name and cite you, who they recommend instead, and what on the page to fix.
“best sourdough bakery in portland”
ChatGPTNamed #2
PerplexityNamed #1 · cited
GeminiNamed #3
ClaudeNot yet
Schema that validatesArticle, FAQ, Product, LocalBusiness, HowTo and more.
Lives in WordPressChecks in the editor, fixes in one click.
Bulk auditsMany URLs, one ranked report.
Core Web VitalsField and lab data, mobile and desktop.
REST APIEvery tool behind one key.
Answer engine optimization
Search changed. Your SEO tool should too.
More searches now end in an AI answer that names a few brands and quotes a few sources. Hydrogen SEO checks whether answer engines can fetch and quote your pages, and measures whether they actually name you.
- AI search crawlers allowed in robots.txt, with a firewall test
- Content readable without JavaScript, with the answer up front
- Visibility, citations and share of voice in ChatGPT, Perplexity, Gemini and Claude
- Scheduled monitoring, with alerts when the answers change
Hydrogen SEO for WordPress
Free on WordPress.org · GPLv2
- On-page checks and SERP preview in the editor
- Titles, meta, Open Graph and X cards
- XML, video and Google News sitemaps, robots.txt, llms.txt editor
- Redirect manager and 404 monitor
- Article, FAQ, breadcrumb and local business schema
- Breadcrumbs with a shortcode or PHP function
- Works with the block editor, Elementor and Divi
WordPress
The SEO plugin that does the work for you
Connect the plugin to your account and every audit finding becomes a one-click fix inside wp-admin. Pro adds bulk AI meta for hundreds of posts and automatic updates.
Lightweight
Only loads what the page needs.
Safe to switch
Dry run, import, roll back.
Why Hydrogen SEO
Most SEO tools stop at the diagnosis
We end at the change you publish.
| Typical SEO plugin | Hydrogen SEO | |
|---|---|---|
| Finds on-page issues | ||
| Ranks issues by traffic impact | ||
| Writes the fix with AI | ||
| Checks AI answer-engine readiness | ||
| Audits sites that are not WordPress | ||
| REST API on every plan | ||
| Free plan with every SEO tool |
Pricing
Simple pricing. Every SEO tool on every plan.
Start free with 500 credits. Upgrade when you need more sites or volume — never to unlock a feature.
Free
Try everything on one site.
$0forever
No credit card required
Takes 20 seconds
- 500 AI credits on signup
- 1 site
- Every SEO tool: audits, AI fixes, schema, API
- Free WordPress plugin
- One-click import from Yoast & Rank Math
Most popular$599$399once
Pro−33% launch price
For serious sites and freelancers.
One payment, yours forever — credits refresh every year
One-time payment · secure checkout
- 20,000 AI credits every year
- Up to 10 sites
- Everything in Free
- AI visibility and AEO monitors
- Hydrogen SEO Pro plugin + auto-updates
- Bulk AI meta for hundreds of posts
- Priority email support
Max−20% launch price
For agencies and portfolios.
One payment, yours forever — credits refresh every year
One-time payment · secure checkout
- 50,000 AI credits every year
- Up to 500 sites
- Everything in Pro
- Built for agencies and portfolios
- Full REST API for client reporting
- Priority email support
No card for the free planSecure checkout by Dodo PaymentsUpgrade or change plans anytimeEvery SEO tool on every plan
Questions, answered
Is the SEO audit really free?
Yes. The audit on this page runs without an account or a credit card. Creating a free account gives you 500 AI credits, every fix for every issue, and the AI rewrites — still with no card.
What is a credit?
Credits pay for the work the AI and crawler do: an alt text is 1 credit, a title and meta description is 2, schema is 2–3, a Core Web Vitals check is 4. Every tool is available on every plan — plans differ only in credits and sites.
Do I need WordPress?
No. The dashboard and API audit any public website. If you do run WordPress, the free Hydrogen SEO plugin brings the checks into the editor and applies fixes without copy-pasting.
Can I switch from Yoast SEO or Rank Math?
Yes. The plugin imports titles, descriptions, robots settings, social tags and redirects in one click from Yoast SEO, Rank Math, All in One SEO, SEOPress, The SEO Framework, Slim SEO, SureRank. You can run a dry run first, and roll it back.
What does “AI search visibility” mean?
Answer engines like ChatGPT, Perplexity, Gemini and Claude name a few brands and cite a handful of sources. Hydrogen SEO asks them the questions your customers ask, measures how often they name and cite you against your competitors, and checks whether your pages can be fetched, read and quoted.
What happens when I run out of credits?
Tools pause until you upgrade or your yearly allowance refreshes. Nothing is ever charged automatically.
See what is holding your site back
Your score, your top issues and the first fixes — free, in under a minute.
No credit card required · 500 free credits when you sign up