One URL, one verdict: indexable or not, and if not exactly why. We cross-check the 6 signals in a single pass to avoid blind spots.
A URL's indexability depends on 6 distinct signals that interact: HTTP status, robots.txt, meta robots, X-Robots-Tag, canonical chain, hreflang. Checking each signal separately (with 6 different tools) then cross-referencing by hand is the #1 cause of indexing bugs that slip through. This tool aggregates them into ONE verdict with the detail.
Practical hierarchy. (1) HTTP status, a 4xx/5xx = invisible page, period. (2) robots.txt, blocks crawl, so indexing too (except the marginal case of already-known URLs). (3) X-Robots-Tag header, server-side deindexing, applies even to PDFs/images. (4) meta robots, HTML-side deindexing. (5) Canonical, changes the indexed URL in favor of another. (6) Hreflang, does not affect indexing, only which version is served per country/language.
Indexability ≠ ranking. If Search Console says "Indexed" but the page does not rank, the problem is elsewhere: content quality, intent mismatch with the target keyword, missing authority signals (backlinks, internal links), too much SERP competition, or discovery issue (orphan page, missing sitemap). This tool only diagnoses indexability, not ranking.
If page A points to page B as canonical, Google will index B, not A. So A is technically "crawlable and accepted by Google", but it will not be the URL served in SERPs, B will appear. Valid case: parametrized versions (?utm) that canonicalize to the clean page. Problematic case: page A should be indexed separately but inherited a canonical from a template.
Before buying, check that the home of your future backlink is really indexable. And on Nautilinks, every network site is documented with its authority signals.