HTML Tidy seems like a powerful tool although I am having a hard time to find from their docs whether they do simple validation (I guess it does given that you ask the question).
This html5validator gives you a simple yes/no answer whether some files are HTML5 valid. It is based on the same backend that powers https://html5.validator.nu/.
It can be integrated in continuous integration. The README contains example configurations for TravisCI and CircleCI.
I think the continuous integration is key to emphasise.
HTML Tidy does validation as its default action (tidy <html file>), but unlike this, it doesn't seem to be able to target an entire directory (html5validator --root <directory of html files>), so there's another difference there.
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[ 2.7 ms ] story [ 17.2 ms ] threadThis html5validator gives you a simple yes/no answer whether some files are HTML5 valid. It is based on the same backend that powers https://html5.validator.nu/.
It can be integrated in continuous integration. The README contains example configurations for TravisCI and CircleCI.