No install needed
28 free SEO tools in your browser
From meta tag checks to keyword research to AI crawler analysis. Every tool runs in your browser with zero setup.
🔍 On-Page SEO
⚙️ Technical SEO
📈 SERP & Content
📍 Local SEO
Chrome Extension
Full SEO suite for any page you visit
One install, every page you visit. On-page audits in one click, crawler access checks, GSC and GA4 data, all without leaving the tab.
🔍 On-Page SEO
Complete on-page audit at a glance
On-Page Audit — Title, description, canonical, robots, HTTP status with live SERP preview and pixel measurement.
Heading Structure — H1–H6 tree with error detection. Highlight headings directly on the page with color-coded badges.Try it free →
Links & Images — Internal/external links, broken URLs, nofollow/dofollow. Image ALT tags, file sizes, format analysis.Try it free →
Schema Validation — JSON-LD extraction with deep checks. Validates content against schema data, not just syntax.Try it free →
🕷️ Crawling & Technical
What search engines and AI crawlers really see
Crawler Access Checker — Check which of 37 crawlers (AI bots, search engines, OAI-AdsBot) can access your site via robots.txt rules and live User-Agent checks.Try it free →
hreflang Checker — Validate hreflang tags, return links, self-references, x-default, and language code format across all alternates.Try it free →
Sitemap Validator — Validate XML sitemaps, check URL health, detect duplicates, and get a health score with actionable fixes.Try it free →
Broken Link Checker — Find 404 errors, dead links, and redirect chains. Scan a page or bulk-check up to 2,000 URLs from your sitemap.Try it free →
JS vs No-JS — Compare what content disappears without JavaScript. Critical for understanding what AI crawlers actually see.Try it free →
Indexation Alarm — Extension icon turns green/yellow/red based on indexability. See the status without opening the popup.
Social & OG — Open Graph and Twitter Card preview. Verify how your page looks when shared on Facebook, Twitter, LinkedIn.Try it free →
📸 Productivity
Built for SEO professionals
Full-Page Screenshots — Desktop, phone, tablet with auto-stitching. Perfect for client reports.
Local Search — Search Google from any city using UULE parameters. No VPN needed.
Keyboard Shortcuts — Press 1–9 for tabs, ? for help. Built for speed. Dark mode included.
Generative Engine Optimization
Built for the AI search era
Google-Agent, GPTBot, ClaudeBot: AI agents are browsing the web right now. Lumina checks which ones can access your site and helps you optimize for AI-powered search.
AI Crawler Access Check
See which AI bots (Google-Agent, GPTBot, ClaudeBot, PerplexityBot, Google-Extended) are allowed or blocked via robots.txt, with live server verification.
llms.txt Checker
Verifies if the site has an llms.txt file that guides AI crawlers on what content to index and how to cite the site. Checks both llms.txt and llms-full.txt.
AI Traffic Dashboard
See how much traffic comes from ChatGPT, Perplexity, Claude, Gemini, and Copilot, with per-platform breakdown, trend chart, and conversion comparison. Requires GA4.
Connect your API keys
Power features — free to use
90% of Lumina works out of the box. Add your own API keys for AI analysis, keyword volumes, and live SERP data. Your keys stay in your browser. Nothing passes through a Lumina server.
FREE GOOGLE OAUTH
Google Search Console
Full GSC dashboard inside the extension, or open it on the web →
- Clicks, impressions, CTR, position with comparison chart
- Top queries and pages with volume enrichment
- Keyword cannibalization detection
- Winners/losers and low-hanging fruit analysis
FREE GOOGLE OAUTH
Google Analytics 4
Complete GA4 dashboard with period comparison, or open it on the web →
- Sessions, users, engagement rate, conversions
- Sources, pages, countries, devices breakdown
- User journeys and exit page analysis
- GSC × GA4 cross-reference
DATAFORSEO API KEY
Keyword Research & SERP
Live keyword data and SERP analysis.
- Search volume, CPC, competition, trend sparklines
- Related and long-tail keyword suggestions
- Live SERP checker with feature detection
- Target keyword tracking per URL
OPENAI API KEY
AI-Powered SEO Tools
SEO copilot with full page + data context.
- Content optimizer with competitor analysis
- Meta title & description generator with SERP preview
- Schema JSON-LD generator with site-wide data
- SEO localization and content translation
How Lumina compares
More features. Zero cost.
Lumina combines features that usually require multiple paid tools, in one free extension.
| Feature | Lumina | Other SEO Extensions |
|---|---|---|
| On-page SEO audit | ✓ | varies |
| Live editable SERP preview | ✓ | ✗ |
| Schema deep validation | ✓ | rare |
| AI crawler check (robots.txt) | ✓ | ✗ |
| llms.txt checker | ✓ | ✗ |
| hreflang validation | ✓ | ✗ |
| AI Traffic Dashboard | ✓ | ✗ |
| Google Search Console | ✓ | ✗ |
| Google Analytics 4 | ✓ | ✗ |
| Keyword research | ✓ | often paid |
| AI content tools | ✓ | ✗ |
| JS vs No-JS comparison | ✓ | ✗ |
| Full-page screenshots | ✓ | ✗ |
| Price | Free | Free – $$$ |
Extension Screenshots
See Lumina in action
Click any screenshot to enlarge.
Overview — Dark Mode
Google Search Console
Google Analytics 4
Keyword Research
SERP Analysis
Technical SEO
Schema Validation
Heading Structure
Image Analysis
Link Analysis
Social / OG Preview
Semantic HTML
About the creator
Built by a practitioner,
not a startup.
Frequently asked questions
Got questions?
Is Lumina really free?+
Yes. Lumina is 100% free with no account required. Most features work instantly without any setup. Some advanced features (keyword research, AI content tools) use your own API keys from third-party providers. You only pay what you use directly to them.
What is GEO (Generative Engine Optimization)?+
GEO is the practice of optimizing your content for AI-powered search engines like ChatGPT, Perplexity, Claude, and Google's AI Overviews. Lumina helps you check which AI crawlers can access your site, verify your llms.txt file, and track AI-driven traffic through your GA4 data.
Does Lumina collect my data?+
No. All analysis happens locally in your browser. Lumina has no backend server, no analytics, and no tracking. API keys and OAuth tokens are stored in Chrome's local storage on your device. Read the full privacy policy for details.
Do I need API keys to use Lumina?+
No. Over 90% of features work without any keys — on-page audits, heading analysis, link checking, schema validation, robots.txt parsing, llms.txt checking, hreflang validation, JS vs No-JS, screenshots, and more. API keys give you access to keyword research (DataForSEO), AI content tools (OpenAI), and live GSC/GA4 data (free Google OAuth).
What permissions does Lumina need and why?+
Lumina needs activeTab and tabs to read the current page, webRequest for HTTP headers, scripting for on-page features like heading highlighting, and host_permissions for robots.txt fetching and API calls. All permissions are explained in the privacy policy.
How do free SEO tools compare to paid tools like Ahrefs or Semrush?+
Paid tools win on two things: massive backlink databases and historical data going back years. Free tools are better at on-page audits and technical checks you run once per page. For most sites under 10,000 URLs, a free stack covers the majority of daily SEO work. You only hit the wall when you need competitor backlink data or ranking history at scale.
Are free SEO tools effective for a real audit?+
Yes, if you know what to audit. A full technical audit (robots.txt, sitemap, hreflang, schema, headers, redirects) can be done entirely with free tools. What free tools can't replace is the judgment to prioritize fixes and decide what actually matters for your business. Tools show you problems; you still have to pick which ones to solve first.
Where should I start if I'm new to SEO tools?+
Start with the on-page audit. Run a meta tag analyzer on your top 5 pages, then check headings, schema, image alt tags, and internal links. These checks usually account for most of the easy wins on a small site. Once those are clean, move to technical SEO and performance.
What can't free SEO tools do?+
The limits are honest. Free tools can't maintain large-scale backlink databases or track rankings across thousands of keywords, because both require running a distributed crawler that costs real money to operate. Paid tools like Ahrefs and Semrush invest heavily in that infrastructure, which is where your subscription fees actually go. Free tools can analyze any single URL in seconds, but they can't maintain a database of the whole web.
Start analyzing your site today
Free tools, no account, no limits. Use them online or install the Chrome Extension for instant access on every page.