Sites and apps similar to Rocket Validator include Scrutiny. It's paid, but HTML Validator and W3C Markup Validation Service are free. Other options are Screpy, Total Validator and Batch HTML Validator. In total there are six SEO Tools like Rocket Validator for Mac, Windows and Linux.
If you need more features than only a website link checker - such as XML sitemap (conforming to the standard protocol), html validity, essential SEO checks such as page title, headings, meta description and keywords - then try Scrutiny.
Screpy is an AI-based web analysis tool that can analyze all pages of your websites in one dashboard and monitor them with your team. It's powered by Lighthouse and it also includes some different analysis tools (SEO, SERP, W3C, Uptime, etc).
Total Validator is an HTML validator, an accessibility validator, a spell checker, and a broken links checker all rolled into one tool, allowing one-click validation of your website.
HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of errors of a HTML page is seen on the form of an icon in the status bar when browsing. The details of the errors are seen when looking the HTML source of the page.
This batch W3C validator tool is perfect to find out HTML errors on websites and check the markup validity of URLs in HTML, XHTML or HTML5. Using a HTML validator tool like this one can save you time and money and is good for SEO purposes also.
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