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Turnitin claims its AI indicator already covers paraphrased and humanized text. QuillBot makes no bypass claim for its own rewriting tools. What sits between those two positions, and what it means for a document you are about to submit.
Grammarly's AI Humanizer is an agent inside the writing suite, built by linguists for tone and voice across six languages, free to start and included in Grammarly Pro at $12 a month. It holds academic tone better than any humanizer we ran and moves a Turnitin reading less than any of them. This review explains why that combination follows from what Grammarly built the tool for, and what it means for a thesis chapter.
The keyword field is the box most authors fill in last, usually with words lifted straight out of the title. Every one of those is a wasted slot. Here is what earns a slot instead, how to check a candidate term against a controlled vocabulary, and how to test one before the form is submitted.
Every guide defines the four letters and stops there. The part that decides whether an AI-assisted page ranks is which of the four a draft can carry unaided. Three of them survive an automated workflow. One cannot be generated at all, and supplying it is a research job rather than a writing job.
Phrasly is an AI humanizer and stealth writer with a document editor, a paraphraser and an API behind one login, starting at 550 free words without a card. This review judges it for academic work, where citations, instrument names and reported statistics have to survive the pass intact. It also examines its claim to bypass Anthropic's watermark, a much harder thing to promise than the marketing suggests.
The submission field caps at 250 words and the abstract runs to 341. Cutting works from cheapest to most expensive: background sentences and hedges first, compression second, and content only once the first two passes have run out. Here is the order, with the limits eight journals actually publish.