W3C Markup Validation Service is described as 'Validates HTML markup of web pages, one at a time' and is an website in the Development category. There are six alternatives to W3C Markup Validation Service, not only websites but also apps for Mac, Windows, Linux and Firefox. The best alternative is Screpy. It's not free, so if you're looking for a free alternative, you could try HTML Validator or Total Validator. Other great sites and apps similar to W3C Markup Validation Service are Scrutiny (Paid), Batch HTML Validator (Paid) and Rocket Validator (Paid).
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).
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Screpy vs W3C Markup Validation Service opinions
Almost everyone thinks Screpy is a great alternative to W3C Markup Validation Service.
Thanks to this tool, I realized the effect of w3c on SEO.
Positive comment • 12 months ago
ynmrzcn I think best W3C Validation and monitoring tool.
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.
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.