Third-party crawlers simulate how Google treats your site. Search Console reports what Google actually did. Here's why an audit needs both, not just one.
Every third-party SEO audit tool, including the crawl and index checks in this product, works the same fundamental way: it sends its own crawler to your site and infers, from what that crawler observes, how a page is likely to be treated by Google. That inference is useful and, for most checks, reliable. It is still an inference. Google Search Console is the one data source that isn't inferring anything — it's Google reporting what Google itself actually did, from Google's own crawl and index. Those are meaningfully different categories of information, and treating third-party simulation as a full substitute for the real thing is a gap worth understanding rather than assuming away.
What a Third-Party Crawler Can and Can't Tell You
A well-built audit crawler can tell you, with reasonable confidence, whether a page is technically crawlable and indexable — correct status codes, no unintended noindex or robots.txt block, a clean canonical, no obvious rendering failure. What it cannot tell you with certainty is whether Google's crawler actually visited a given page recently, whether Google chose to index it despite it being technically indexable, or which specific exclusion reason Google applied if it didn't. Those are decisions and records that exist only inside Google's own systems. A third-party tool can predict them well; it cannot report them directly, because it doesn't have access to Google's crawl log or index database — only Search Console does.
What Search Console Actually Adds
Real Index Status, Not a Prediction of It
Google's own description of the report is direct:
"See which pages Google can find and index on your site, and learn about any indexing problems encountered."
— Google Search Console Help, Page Indexing report
In practice, that report reports Google's actual decision for every known URL — indexed, or excluded with a specific labeled reason (crawled but not indexed, discovered but not yet crawled, duplicate without a user-selected canonical, blocked by robots.txt, and the rest of the set we break down in detail in our Crawling & Indexing guide). A third-party crawler can flag a page as likely to have an indexing problem. Only this report confirms it did, and tells you which of several possible reasons applied — information that materially changes what the fix should be.
Real Click and Impression Data
Estimated ranking positions from third-party rank tracking are a controlled, repeatable measurement, useful for exactly the reasons covered in our piece on rank tracking. They are still not the same thing as Google's own record of actual impressions, clicks, and average position for real queries against real users, which is what Search Console's Performance report provides. Combining both gives you a tracked, controlled series and a ground-truth record to check it against.
Field Data for Core Web Vitals
The Core Web Vitals report in Search Console is built on the Chrome User Experience Report — real measurements from real Chrome users who actually visited your pages, which is a different and, for ranking purposes, more authoritative signal than lab data collected by any single automated tool running in a simulated environment. We cover the field-versus-lab distinction in more depth in our Core Web Vitals guide; Search Console is the direct channel to the field half of that picture.
Want both halves at once without waiting on Search Console's reporting lag? The INP & Core Web Vitals Checker shows field and lab data together for any URL, instantly.
Why Not Just Rely on Search Console Alone, Then
If GSC is ground truth, the natural question is why run third-party checks at all. Two practical limits keep it from being sufficient on its own. First, latency: Search Console's data reflects what Google has already crawled and processed, which lags behind the current state of your site by anywhere from days to weeks depending on the report. If you just shipped a fix, GSC won't confirm it worked until Google gets around to recrawling and reprocessing the affected pages. A third-party crawl can check the current, live state of a page immediately, which is what you actually want during active remediation work. Second, coverage: Search Console's reporting has practical limits on URL-level detail and history depth, and it only ever reports on Google specifically — it has nothing to say about how Bing, or any AI crawler, is treating your site.
The two are complementary rather than substitutes: third-party audits for fast, current-state checking and for anything outside Google's own reporting scope, Search Console for the ground-truth confirmation of what Google's index actually reflects.
How This Shows Up in an Audit Workflow
Connecting Search Console to a site's ongoing audits means index and performance issues get cross-checked against Google's own record instead of resting on simulation alone — a page an audit flags as a likely indexing risk can be checked directly against the actual Page Indexing status for that URL, and performance issues surfaced by lab and simulated checks can be weighed against real CrUX field data rather than a single synthetic measurement. That combination is what SearchVitals' GSC integration is built to provide: audits stay fast and current using our own checks, with Search Console connected per site to confirm what Google's index and Chrome's real-user data actually show.