If you're looking for a plagiarism checker that offers results as a percentage and that suggests rewriting, DupliChecker is a good choice. It can handle a range of file types and languages and uses AI technology to spot even brief passages of plagiarism. The tool also offers instant plagiarism removal, grammar error detection and a paraphrase tool to help you refine your writing. DupliChecker also has a grammar checker and content generation tools, and it doesn't store user content to protect privacy.
Another good option is Paperpal, an AI-powered academic writing tool. Paperpal offers plagiarism detection with similarity scores, real-time grammar checking and a paraphraser that maintains a formal tone. It also has tools like high-quality academic translations, a submission readiness checker and MS Word integration. Paperpal is good for all stages of writing and has data security with ISO/IEC 27001:2013 certification.