What type of quality check are you looking for? Depending on what type of content and what you want to check it for, there are a lot of options. My answer below assumes you want to check a piece of writing, not a video or image.
For Grammar and Spelling most Word Processors (Word, LibreOffice etc.) have a spellcheck and will underline misspelled words or poor grammar. If you are looking for reading grade, what level of reader and education level your writing is suitable for, googling reading grade tools will find lots, although they are geared to US english, so if you use International English, you might find them less useful.
If you want to check email content in case it looks spammy then tools like mailtester can start to flag problems with your email or anything in content or setup that will get it rejected.
If you want to check quality of content for SEO, e.g. the value of keywords etc. that is harder because all the tools I know check the whole webpage, not just an article or piece of content.
Finally if you want to check for originality, either to prevent plagarism or to make sure that your site doesn't look too similar to someone elses for SEO purposes, the best bet might be to use one of the many online plagarism checkers. You can find a lot through search engines, just use check for plagiarism free keywords and you should get something useful.
What are you trying to check for? If you can give me more details I might be able to help more.