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Top WebsitesBrowse traffic rankings Top KeywordsWhat people search for Trending KeywordsSee what's rising Site Page Speed TestSpeed test any URL SEO WikiTerms simply explained SEO Page CheckerAnalyze on-page SEO Chrome ExtensionInsights while you browse

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Chrome extension

SEO audit any website, right in Chrome

Seonio turns Chrome into an SEO audit tool. One click scans the page you're on and gives you a full on-page audit in seconds.

Add to Chrome See what it checks

Free, no accountAny open tabExport pages as Markdown or HTML

Seonio Chrome side panel showing an on-page SEO audit — Click the screenshot to view it full size

Why the extension

Private, fast and free

Everything runs in the tab you scan, with a one-line fix for every issue.

100% localPage data never leaves your browser. No servers, no telemetry, no account

FastOpen the side panel, click scan, get results in under two seconds

ActionableEvery issue comes with a one-line fix and the HTML that caused it

FreeNo paywall and no pro tier

What it looks like

A clean side panel that stays out of your way

Overview, assets and previews, one tab each. Click a screenshot to view it full size.

Seonio side panel overview with overall score and severity breakdown — Overview
Score, severity breakdown, six categories at a glance.

Assets overview in the Seonio side panel — Assets finder
Every image, font and script on the page — copy, download, preview.

Seonio side panel showing Google SERP and social card previews — SERP & social previews
See how Google, Twitter and Open Graph will render the page.

What it checks

Six categories, one audit

Everything Seonio inspects on a page, grouped so the most important fixes surface first. The same categories apply whether you paste a URL into the SEO page checker or scan a tab with the extension.

Indexability

Will Google index this page?

Robots directives, canonical tags, HTTPS and hreflang. The signals search engines check first.

RobotsCanonical

Metadata & SERP

How the page appears in search

Title, meta description, language, URL quality and favicon, with a live Google SERP preview.

Title & MetaSERP Preview

Content structure

Headings, hierarchy & top terms

H1–H6 hierarchy, duplicate or missing H1s, thin-content warnings and the page’s top terms.

Heading outlineTop terms

Links & images

Internal links & image alt text

Internal vs external links, anchor quality, broken anchors and missing image alt text.

AnchorsImage alt

Schema & social

Structured data & share previews

Open Graph, Twitter Cards and JSON-LD schema, with social card previews side-by-side.

Social cardsSchema

Technical signals

Doctype, charset, viewport, DOM

The foundational signals that make a page render and crawl correctly across devices.

Page basicsDOM size

How it works

Three clicks from install to insight

No account and no setup.

Install

Install

Add Seonio from the Chrome Web Store in one click.

Chrome Web StoreFree

Open

Open the side panel

Open any page, public or private, and click the Seonio icon.

Any tablocalhost too

Scan

Scan

A scored, grouped audit with HTML evidence and a one-line fix per issue.

Categories6 checked

Private by design

The minimum permissions, no tracking

The extension only sees the tab you actively scan, and only when you click the button.

Built on Manifest V3

Every scan runs in your browser. No external APIs, no telemetry, no backend.

Zero network calls during a scan, verifiable in DevTools
No tracking, no analytics
No account required

Permissions

activeTab: Read the page you’re currently viewing
scripting: Inject the data collector into the active tab
sidePanel: Render the audit UI in Chrome’s side panel
tabs: Detect the URL of the active tab
storage: Remember your last scan locally

Chrome extension

Audit any page in seconds

Add the extension for one-click audits on every tab: public, private, staging or localhost. Or check a public URL without installing anything.

Add to Chrome Check a public URL

More free tools

Keep checking for free

Speed tests, traffic rankings, keyword trends and the SEO wiki. No account needed.

Top Websites

Browse traffic rankings and see which sites lead a market.

Top Keywords

See what people search for, ranked by volume.

Trending Keywords

Discover what's rising before it peaks.

Site Page Speed Test

Speed test any URL and see what slows it down.

SEO Page Checker

Analyze on-page SEO for any URL.

SEO Wiki

SEO terms, simply explained.

$1 testing balance · No card required

Turn search insights into measurable growth

Start your SEO research in seconds.

Get started for free See pricing

SEO researchREST APIMCP