Paste your robots.txt, pick a bot and a URL, and see whether the URL is allowed or blocked, which rule decided it, and any errors. Free, no sign-up. It cannot fetch a live file from another domain, so you paste the contents. Google handles * and $ wildcards but not every crawler does, so confirm in Search Console too.
Allowed or blocked verdict, deciding rule shown, syntax errors flagged, user-agent matching with wildcard fallback, longest rule wins with Allow winning ties, free, no sign-up.
Testing a Disallow rule before deploying it, finding out why a page is not being crawled, checking a staging robots.txt.

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