Full-site technical SEO audits that run locally — not a cloud subscription. 140+ checks per page, every byte stays on your disk. No quotas. No per-URL tax. No login.
Built for SEOs who already know what they're looking for. Keyboard-navigable, filterable, exportable. Nothing stands between you and the finding.
Cloud auditors built a business on uploading your clients' HTML and charging by the URL. Scannica flips it: the crawler runs on your desktop, results sit in a local SQLite database, and nothing is phoned home.
Crawl, analyze, audit, report. Each surface in Scannica maps to one of them — so the workflow matches how SEOs actually think, not how a vendor SKU is priced.
Saturates a site without knocking it over. Robots-aware, rate-limited, resumable.
Parses real head tags, real markup, real response headers — and diffs rendered DOM against static HTML.
Every finding has a stable code (TITLE_TOO_LONG, SEC_CSP_UNSAFE_EVAL, GEO_NO_LLMS_TXT) and a severity. No mystery scores.
Every crawl is a single portable file. Compare two crawls side by side. Export for the dev ticket.
Traditional SEO auditors stop at title tags and canonicals. Scannica also
checks what matters when Google's AI Overviews, ChatGPT, and Perplexity
read your page: entity density, author signals, citation markup,
llms.txt,
Speakable schema, FAQ and Article structured data.
Nine GEO checks. No other desktop auditor ships them.
A sampler of what actually sets Scannica apart once a crawl lands.
A headless browser collects real LCP, CLS, and INP per URL — then Scannica diffs the rendered DOM against the static HTML. Pages that only exist after hydration? Caught.
+ <article data-ssr="false">
+ <h1>Plans built for scale</h1>
+ <a href="/plans/enterprise">...</a>
<section id="faq">
<h2>Frequently asked</h2>
</section> Scannica walks every redirect to its terminus and surfaces loops before they surface in Search Console. Chains longer than two, mixed 301/302, HTTP→HTTPS hand-offs — all flagged with the URL that started the mess.
REDIRECT_CHAIN REDIRECT_LOOP HTTP_TO_HTTPS_REDIRECT HTTPS enforcement, CSP directives, HSTS, cookie flags, mixed content — each flag carries the rule code AND a CWE reference so your engineers can triage without a translator.
| Strict-Transport-Security — | max-age=15552000; includeSubDomains |
| Content-Security-Policy SEC_CSP_UNSAFE_EVAL | script-src 'self' 'unsafe-eval' *.vendor.com |
| X-Frame-Options SEC_PERMISSIONS_POLICY_MISSING | missing |
| Set-Cookie: session SEC_COOKIE_NO_HTTPONLY | HttpOnly ✗ · SameSite ✗ |
| Mixed content SEC_MIXED_CONTENT_PASSIVE | 3 http:// resources on https page |
Feed in one or many sitemap.xml files.
Scannica diffs them against the live crawl: pages listed but unreachable, pages crawled
but absent from the sitemap, stale entries pointing at 404s. Migration QA without the spreadsheet.
No fashion stack. The parts we picked are the ones you'd pick if you were answering for performance at 3 AM.
Parallel crawl engine with no GC pauses on million-URL jobs.
Analyzes pages as bytes arrive. No DOM construction tax per URL.
Chrome DevTools Protocol for headless rendering and Core Web Vitals.
Lean native binaries. Not an Electron tax.
Concurrent reads while crawling. Every session is a single file.
Collision-resistant at scale. Keeps memory flat.
If yours isn't here, the team is a real email away — not a ticketing portal.
A desktop app for serious SEO work. No account, no form, no per-URL billing. Launching on macOS, Windows, and Linux.