The Tool Desk
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What a first technical SEO audit can—and cannot—tell you
A crawler discovers and fetches URLs according to its starting point, settings and available discovery sources. The results are therefore a view of the site under those conditions, not a complete inventory by default. Robots rules, crawl limits, JavaScript rendering and the URL sources you include can all affect what appears.
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A crawler can flag conditions to investigate, such as a response error, a page marked non-indexable or a canonical pointing elsewhere. It cannot, by itself, prove that a condition caused a ranking change. Treat tool findings as leads: confirm the page behavior and evidence, then explain user or search-engine consequences only when they are supported.
Choose a crawler for the job
These are documented product differences, not a comparative performance test. Check current vendor pricing and limits before purchase, since plans and capacities can change.
| Crawler | Platform and crawl options | JavaScript and reporting | Consider it when |
|---|---|---|---|
| Screaming Frog SEO Spider | Desktop software with configurable crawl behavior, robots handling, canonical checks and sitemap crawling. Its free Lite form is documented as crawling up to 500 URLs in the vendor’s undated canonical-audit tutorial. Screaming Frog: How To Audit Canonicals | The standard configuration does not execute JavaScript; rendering is available in the paid version, according to its FAQ. Results are exposed through tabs, filters and issue-specific reports. Screaming Frog FAQ | You want configurable crawl data and the free 500-URL entry point is sufficient for the scope. |
| KWT Spider | Windows desktop crawler. Its v1.3 settings document controls for maximum depth, maximum URLs, threads, robots.txt handling and user agent. The documented default maximum is 100,000 URLs—not a recommended size for every audit. KWT Spider crawl settings | Its v1.3 FAQ describes basic rendering and cautions that complex single-page applications may expose fewer URLs than a full browser crawl. Overview and detail tabs and export formats are described by KWT Labs. KWT Spider FAQ | You need a Windows desktop option and its version-specific features fit the audit. |
| Sitebulb | Desktop and Cloud offerings. Setup lets you select audit data, crawl sources, crawler type, subdomain options and speed limits. The vendor states capacities of up to 500,000 URLs per Desktop audit and up to 10 million per Cloud audit; these are plan capacities, not independent performance measurements. Sitebulb | Its HTML Crawler is the traditional extraction mode; its Chrome Crawler renders with headless Chrome for JavaScript-dependent sites. Sitebulb emphasizes prioritized Hints, contextual reports and visualizations. Sitebulb crawler settings | You prefer an audit-led reporting workflow or need to compare HTML and rendered crawls. |
Prepare and run the crawl
1. Confirm scope and permission
Agree with the site owner on the starting URL, the properties in scope and the purpose of the audit. Record subdomains to include, staging areas to exclude, any known URL lists, crawl constraints and the deliverable. Do not casually override robots.txt: Screaming Frog’s default configuration respects it, and KWT Labs recommends leaving “Respect robots.txt” enabled. Screaming Frog configuration · KWT Spider crawl settings
2. Start with a small, controlled crawl
A sample crawl helps catch a wrong start URL or unsuitable configuration before you commit to a larger crawl. KWT’s getting-started guidance suggests starting with a small site or limiting depth to 3 while learning; Sitebulb’s setup guide also describes a sample crawl for very small sites. Set URL and depth limits, request speed and other controls to match the site’s size and the permission you have. Vendor defaults are settings, not universal best practice. KWT Spider overview · KWT Spider crawl settings · Sitebulb crawl setup
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3. Decide whether to render JavaScript
If important navigation or page content appears only after JavaScript runs, compare a plain HTML crawl with a rendered crawl on representative pages. Sitebulb says its HTML Crawler suits most sites and its Chrome Crawler is intended for JavaScript frameworks or rendered content; the Chrome option downloads page resources and takes longer. Screaming Frog’s standard configuration does not execute JavaScript, while its FAQ describes rendering as a paid-version feature. KWT Spider v1.3 offers basic rendering, but its FAQ notes that complex single-page applications may reveal fewer URLs than a full browser crawl. Sitebulb crawler settings · Screaming Frog FAQ · KWT Spider FAQ
4. Add useful URL discovery sources
A crawl following internal links can miss orphan URLs that have no links pointing to them. Where the audit scope and authorization allow, add XML sitemap URLs and relevant URLs from analytics, Search Console or an approved list. Sitebulb’s setup guide supports XML sitemap, Google Analytics and Google Search Console sources. Screaming Frog documents comparing crawled URLs against sitemap URLs to find sitemap-only pages and pages absent from the sitemap. Sitebulb crawl setup · Screaming Frog: How To Audit XML Sitemaps
Review findings in a useful order
1. Check coverage and response status
First establish what the crawler actually reached and how those URLs responded. Look for unexpected gaps, errors and redirects; compare the result with the intended scope and discovery sources. A missing URL may be a discovery or configuration issue rather than a site defect.
2. Inspect indexability and crawlability
Check which URLs are indexable, non-indexable, nofollow or disallowed, then inspect the relevant robots directives and canonical targets. A canonical is a signal to search engines, not proof that the chosen target is correct just because a canonical exists. Sitebulb’s indexability guide describes these as early audit areas and links them to reports for those URL groups. Sitebulb: Auditing Indexability & Crawlability · Screaming Frog configuration · Screaming Frog: How To Audit Canonicals
3. Review internal links and page elements
Once coverage and indexability make sense, examine internal linking and the page elements relevant to the audit. Look for patterns that affect a group of pages, not only isolated warnings. For a very large Sitebulb crawl, its 2026 setup guidance notes that some reports may be omitted for sites with 100,000 or more pages to reduce crawl time; that also means checks such as image alt text, speed and mobile friendliness may be absent. Sitebulb crawl setup
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Investigate sitemap URLs that the crawl did not find and crawled URLs absent from the sitemap. Either difference merits context: a page may be intentionally excluded, inaccessible under the crawl settings or omitted from the sitemap. Confirm what should be included before describing a mismatch as a defect. Screaming Frog: How To Audit XML Sitemaps
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5. Validate before recommending a fix
Open a sample of affected URLs and verify the behavior in context. Check whether the issue is consistent across a template, whether the crawler used the appropriate rendering mode, and whether the page is meant to be accessible or indexable. A report label alone is not enough evidence for a sitewide change.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Turn confirmed issues into an action plan
For each verified finding, create a record that a developer or site owner can act on:
- Scope: the affected URL pattern, template or specific pages.
- Evidence: what the crawl reported and what you confirmed on representative URLs.
- Consequence: a user or search-engine effect only when the evidence supports it.
- Recommendation: the specific change to make, rather than a generic instruction to “fix SEO.”
- Owner and priority: who should address it and why it should be handled before or after other verified issues.
Keep unverified tool flags separate from confirmed defects. This makes the handoff useful without overstating what a crawl proves.
Quick Recap
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