Broken Link Checker is a free web tool (and a popular WordPress plugin) that crawls websites to find broken links and reports 404 errors. The standalone web version is commonly used for one-time link audits.
Broken Link Checker does one thing well: find broken links. That's genuinely useful for a one-time audit, and the free tier is hard to argue with for that specific task. StoreVitals scans for broken links too — but that's one of 20 health checks. You also get security header analysis, SSL validation, performance issue detection, accessibility auditing, structured data validation, and more. For store owners who need ongoing monitoring (not just a one-time audit), StoreVitals delivers continuous automated health reporting that no link checker can match.