Why choose Total Validator rather than other solutions? We think there are many reasons to use Total Validator, such as cross-platform and multi-forms support. But our users say that these are probably the top three:
HTML Validators tend to fall into two camps: Most of the HTML standards are encapsulated using DTDs, and DTD validators like the W3C are severely limited by the DTD language. So they can't even test that the values of attributes are correct.
Custom validators can go beyond this. But because they use their own rules they often misinterpret the standards, or miss rules within the DTDs, or add in rules that actually don't exist in the standards. People are only human: The more you do yourself the more likely you'll make a mistake. So custom validators may well test more things, but are more likely to perform worse than DTD validators.
Total Validator is unique in that we test using the official DTDs to ensure that we're as good as any DTD validator, and then add in custom tests for everything that the DTDs can't cover. This ensures the best possible test against the standards.
Note that HTML5 doesn't have a DTD, but its built on the other standards, with common sense added in. So we've produced our own HTML5 DTDs based on the existing ones to ensure that we introduce the minimum of mistakes. Then we've simply added more custom tests to cover all of the differences.
For an accessible site, using an accessibility tool is not good enough, your pages also need to be valid HTML or accessibility technology may fail to properly read your site. Everyone knows that broken link checkers are essential and spell checkers too, and CSS validators are like gold dust. But think of the the time it takes to use each type of tool for each page on your site. Each tool has its own way of working and produces its own type of report, so there's a lot to learn. You'll also need to run each of these tools every time you make a change, so that's a lot of overhead.
Total Validator does away with these problems by providing all of these tools in one great package. You can check everything with with just one click with our browser extensions, reducing the time to validate your site properly, and minimising the overhead of making changes.
Standards change, users requests extra features, and sometime bugs are found. We're even working on adding more validations all the time, such as the recently introduced CSS Validator. We want to Total Validator to be the best, and we know you can't be the best by standing still.
That's why we were the first HTML5 validator, and then the first XHTML5 validator, then the first HTML5.1 validator, and the most up to date CSS 3 validator. That's why we issue regular updates all the time, and that's why it's worth investing in using our tools rather than anyone else's.