50% offyour first monthcode
Every layer of your
website, analysed.
Tech stack, performance, security, SEO, GEO (AI search) and local SEO — one report, in seconds. Free plan, no credit card.
- 18 modules
- 7,000+ tech signatures
- Real browser
- Permanent reports
What is StackOptic?
StackOptic is a comprehensive website analysis platform. It runs 18 specialised modules — technology detection, Core Web Vitals, security, SEO, GEO (AI search readiness), local SEO, accessibility, email infrastructure, carbon footprint and more — against any public URL and produces a single shareable report in seconds.
- Analyses run
- Unique domains
- Technologies tracked
- Countries covered
What you get
See exactly what a report looks like.
A live report for digiwings.co.uk — no sign-up required.
Modules passed
17/18
Report generated
8.4s
Technologies
24
Country
🇬🇧 GB
One URL · 18 modules
Everything you need to know about any website.
Calibrated by real browsers. Updated continuously. Grouped into a single shareable report.
Technology detection
Frameworks, CMS, analytics, payments, CDNs — detected from a real browser session, not just headers.
Core Web Vitals
FCP, LCP, CLS, TBT, Speed Index — measured and scored the same way Google does.
Security audit
SSL/TLS, HSTS, CSP, 12+ security headers graded with remediation steps.
SEO & structured data
Meta, Open Graph, JSON-LD, canonical, sitemap, robots.txt.
AI & GEO readiness
llms.txt, 8 AI bot access scores, citation readiness for ChatGPT / Perplexity / Google AI.
Local SEO
NAP consistency, local schema, Google Business alignment. 46% of searches are local.
Email infrastructure
MX, email provider detection, deliverability scoring — catch misconfigs before inboxes.
Accessibility
ARIA, contrast, heading hierarchy, semantic HTML — inclusive by default.
Carbon footprint
Live GWF API + SWDM v4 CO₂ estimate from page weight and hosting energy.
Privacy & compliance
Cookie consent, GDPR indicators, TCF/IAB framework, tracking inventory.
Domain intelligence
Registrar, creation/expiry, nameservers, DNSSEC, reverse DNS — full provenance.
Historical tracking
Compare snapshots over time. Track changes, score trends and infrastructure shifts.
Why StackOptic
The only tool that sees the whole website.
Point tools each do one thing. StackOptic replaces four of them and adds what nobody else audits.
| Capability | Wappalyzer | BuiltWith | Lighthouse | Ahrefs | StackOptic |
|---|---|---|---|---|---|
| Tech stack (7k+ signatures) | Yes | Yes | No | No | Yes |
| Real browser execution | No | No | Yes | No | Yes |
| Security audit (A+ → F) | No | No | Partial | No | Yes |
| Core Web Vitals | No | No | Yes | No | Yes |
| SEO + structured data | No | No | Partial | Yes | Yes |
| AI & GEO readiness | No | No | No | No | Exclusive |
| Local SEO | No | No | No | Partial | Exclusive |
| Email infrastructure | No | No | No | No | Yes |
| Carbon footprint | No | No | No | No | Yes |
| AI deep-dive writeup | No | No | No | No | Yes |
How it works
From URL to report in seconds.
- 01
Paste any URL
No browser extensions to install. Just paste a URL and hit Analyze.
- 02
18 modules run in parallel
A real browser loads the page — bypassing bot protection — and runs every check simultaneously.
- 03
Get a permanent, shareable report
Scores, grades, detected technologies, AI-written insights — all in one URL you can share with clients.
Who it's for
Built for people who work with websites.
Agencies & freelancers
White-label client audits, pitch decks built from real data, bulk analysis at scale.
Generate a reportDevelopers
Audit stacks before you touch the code. Spot outdated dependencies and security gaps fast.
Run an auditMarketers & SEOs
Know exactly what tools competitors run. Audit GEO, local SEO and structured data in one pass.
Analyze a competitorFounders & PMs
Pre-launch checklist, investor-ready reports, technical debt surfaced before it bites.
Check your siteNot just data. Answers.
StackOptic's AI reads your entire report and writes a technical deep-dive — architecture decisions, missed opportunities, prioritized fixes. Ask follow-up questions in chat.
- Full technical analysis written per report
- Interactive AI chat for follow-up questions
- AI readiness scoring for LLM search visibility
- Prioritized, actionable recommendations
Pricing
Start free. Upgrade when you're ready.
One URL. Full clarity. Pick the plan that fits.
Free
Explore any site
$0
- 5 analyses / day
- All 18 modules
- Scores + security grades
- Permanent reports
Solo
Track one site
$7.50/mo
Billed yearly
- Lock one domain
- AI insights
- Re-analysis + history
- Export PDF/JSON
Pro
Audit any client
$19/mo
Billed yearly
- 10 analyses / day
- AI deep-dive
- 50 AI credits / mo
- Comparison reports
Agency
Agencies & teams
$79/mo
Billed yearly
- 50 analyses / day
- White-label reports
- Bulk + REST API
- 5 team seats
FAQ
Frequently asked questions.
What is StackOptic?
StackOptic is a comprehensive website analysis platform. It runs 18 specialised modules — technology detection, Core Web Vitals, security, SEO, GEO (AI search readiness), local SEO, accessibility, email infrastructure, carbon footprint and more — against any public URL and produces a single shareable report in seconds.
How is StackOptic different from Wappalyzer or BuiltWith?
Wappalyzer and BuiltWith only detect the technology stack. StackOptic does that too (with 7,000+ signatures and version detection from a real browser), plus security grading, Core Web Vitals, SEO audit, AI & GEO readiness, local SEO, email infrastructure, accessibility and carbon footprint — all in one report. No other tool covers AI/GEO and local SEO.
What is GEO (Generative Engine Optimization)?
GEO is the practice of optimising a website so AI search engines — ChatGPT, Perplexity, Claude, Google AI Overviews — can find, understand and cite it. Our GEO module audits AI bot access (8 major bots), validates llms.txt and llms-full.txt files, scores machine readability and citation readiness, and checks structured data quality.
What does llms.txt validation check?
llms.txt is an emerging standard that tells AI crawlers which pages to prioritise and how to read them. Our validator checks the file exists and parses correctly, confirms proper heading/blockquote/URL structure, detects llms-full.txt extensions and scores token efficiency for LLM consumption.
Is there a free plan?
Yes. The free plan includes 5 analyses per day, all 18 modules, full scores, technology detection and security grades. Every report is permanently accessible via a unique shareable URL — no login required to view. No credit card needed.
Does it work on sites behind Cloudflare or bot protection?
Yes. StackOptic uses a real browser engine that loads pages exactly like a human visitor — executing JavaScript, rendering CSS, handling redirects. This bypasses Cloudflare, LiteSpeed, Sucuri and other bot protection systems where HTTP-only crawlers fail.
How accurate is the tech stack detection?
Detection is based on real browser execution — DOM inspection, JavaScript runtime analysis, HTTP headers and DNS records. With 7,000+ technology signatures and Lighthouse-calibrated performance scoring, StackOptic achieves high accuracy for mainstream technologies. Confidence scores are shown alongside every detection.
Do you store the websites I analyse?
StackOptic only stores publicly available information that any visitor would see — HTML, HTTP headers, DNS records, screenshots. We do not access private data, log in to websites or perform any intrusive testing. All analysis is performed on publicly accessible URLs.
Can I use StackOptic for client reports?
Yes. The Agency plan ($79/mo yearly) includes white-label reports — your branding, your client-facing URLs. Bulk analysis, REST API, webhooks and 5 team seats are included.
Do you support local SEO audits?
Yes. Our local SEO module checks NAP (name/address/phone) consistency, local schema markup, Google Business signals and local search readiness. Essential for multi-location brands and agencies serving local businesses.
Your next audit is one URL away.
Free. Instant. Shareable. Upgrade only when you're ready.