I almost always use the Etxt Anti-Plagiarism service to check the uniqueness of my new blog articles. It helps a lot, and my posts are quickly indexed without any major issues in both Yandex and Google. This online service has never let me down. If you're concerned about frequently entering CAPTCHA when checking text, it's easy to solve. Just use a specialized online service for automatic CAPTCHA recognition, Antigate, for the eTXT Anti-Plagiarism program. Then you won't have such problems, and you can quickly and efficiently check the text for uniqueness. I personally use this service and recommend it to you. Give it a try!