What it does: Crawls any site and generates a clean XLSX file with all meta tags, technical statuses, and advanced structured data (Schema) validation. How it works: Runs completely locally on your computer with zero URL limits, zero tracking, and no account setup. What it costs: A one-time €50 payment. No €245/year subscriptions for dashboards and features you’ll never actually open.
Built in Python, wrapped as a .app for macOS and a .exe for Windows. Point it at a URL and it walks every internal link, respects robots.txt, writes one XLSX row per page. Title, meta description, H1/H2, canonical, meta robots, X-Robots-Tag, indexability, status code, word count, response time, crawl depth, in-link and out-link counts, full schema audit (count, types, status, issue list), and the full outlink list per page. Same fields most of us actually export from Screaming Frog, plus the structured-data audit that usually lives in a separate paid tool. The 500-URL free cap is gone. So is the annual bill.
AI search engines don't run JavaScript. If your schema is injected client-side, GPTBot and ClaudeBot and PerplexityBot and CCBot all see nothing, even though your rich-results tester says everything's fine. SERPCTRL // Crawler reads exactly what the AI tier reads, on every URL in the crawl, and dumps the result into four XLSX columns. Plus full type-aware schema validation against Google's rich-result rules. The schema module that Screaming Frog, Sitebulb, and Ahrefs charge extra for, included.
GPTBot, ClaudeBot, PerplexityBot, CCBot. Every one of them reads the raw server HTML and ignores anything injected post-load. Most rich-results testers run headless Chromium, so they show you the optimistic version, the rendered DOM that Googlebot eventually catches up to. This audit reads what the AI tier actually reads. Per URL. At crawl scale. The visibility gap nobody else surfaces.
Every JSON-LD block parsed, walked through any @graph wrapper, checked against Google's rich-result rules for the type it claims to be. Article, Product, FAQPage, BreadcrumbList, Recipe, Event, LocalBusiness, VideoObject, JobPosting, Organization. Missing required fields, wrong date formats, currency symbols inside price strings, plain-string authors. Each issue flagged with severity, not crammed into one cell.
Four XLSX columns per row: schema_count, schema_types, schema_status (NONE / OK / WARNINGS / CRITICAL / PARSE ERROR / SKIPPED), schema_issues. Auto-filter on, frozen header. Find every page where AI crawlers see nothing. Send the column straight to dev, or pivot it against your top-traffic pages. Toggle the audit off via the "Run schema audit" checkbox if you only want the core SEO signals.
Screaming Frog Custom Extraction needs a paid licence. Sitebulb's structured-data report is on Pro and up. Ahrefs Site Audit gates it behind a recurring SaaS bill. SERPCTRL bundles the schema audit in the €50 you already pay. Every URL. Every run. No cap.
If you know what data matters in an on-page crawl and just want to extract it, the existing tools charge a yearly fee for a lot of stuff you'll never open.
Screaming Frog bills annually for the full feature set. Most freelancers and small agencies use a fraction of it. The rest of the year the licence sits there, charged but unopened.
Most real audits start at a thousand pages. Screaming Frog's free tier stops crawling exactly when it gets useful, then asks for €245.
Sitebulb, Ahrefs Site Audit, Netpeak. Good tools. They also upload your client's site to a SaaS and start a recurring monthly invoice.
Half the time the spreadsheet is the actual deliverable. You filter it, hand it to dev, archive it in the project folder. Some tools hide the raw rows behind a UI that doesn't export cleanly.
Same on-page audit, side-by-side. Cheapest publicly listed plan, EUR. Live prices, May 2026.
| Tool | Cost | Billing | URL cap (free) | Native desktop | Runs offline |
|---|---|---|---|---|---|
| Screaming Frog (paid) | €245 | per year | - | ● Java GUI | ● |
| Screaming Frog (free) | €0 | - | 500 URLs | ● Java GUI | ● |
| Sitebulb | €1,330 | per year | - | ● | ● |
| Ahrefs Site Audit | €2,148 | per year | - | cloud only | - |
| SERPCTRL // Crawler | €50 | one-time | none | ● Python / native | ● |
// pricing as of May 2026, pulled live from each vendor's licence/pricing page. Screaming Frog €245/year/seat. Sitebulb starting at £95/mo (~€1,330/yr). Ahrefs Lite €179/mo (~€2,148/yr) - Site Audit is part of the broader plan. Screaming Frog free tier capped at 500 URLs and disables several features (custom extraction, scheduling, JS rendering).
Spider mode walks every internal link from a starting URL. List mode takes a CSV, TSV, or TXT and audits exactly those URLs, nothing else. Either way the XLSX comes out in the same shape. Mockups below are the actual GUI.
One sheet, one row per page, frozen header, autofilter on. The column shape mirrors what most SEOs are already pivoting in Excel: same field names, same order Screaming Frog uses.
// 26 columns total. Frozen header, autofilter on, sized for one-row-per-page review. Output path: ~/Documents/serpctrl-crawler/ on macOS, ./crawls/ next to the binary on Windows.
The crawler talks to one server: the site you pointed it at. No telemetry going home, no analytics ping, no account behind it. Your client URLs don't touch ours, because there's no "ours".
Whatever URL you paste. That's the only outbound traffic, plus a one-off robots.txt fetch per host.
No telemetry. No crash reports. The XLSX gets written to your disk and that's the entire output.
Download, double-click, run. No signup, licence file, or email on the way.
Source on GitHub. Read it, fork it, build your own .app with build.sh.
Three operators based out of Rīga, Latvia. No VC money, no growth-hacking team. We built the tool because we needed it on a Tuesday afternoon, and the €1 500/year alternatives weren't going to ship it by Friday.
€50 paid once. No renewal, no licence file, no account waiting for you. Pick the build that matches your laptop and the file lands in Downloads.
Same desktop app whether you're on Mac or Windows. Same crawler, same XLSX.
// mac: macOS 12+ · win: Windows 10+ x64 · download after purchase