AI Undetect vs AI Detector By Custom Writings

AI Undetect checks whether text reads as AI-written, then rewrites it to pass popular detectors. Paste up to 250 words on the free checker, run a multi-detector scan, and hit Humanize AI to paraphrase flagged content. Rewrite styles cover academic, blog, formal, and informal tones across 20+ languages.

Most humanizer tools rewrite blind. AI Undetect runs your draft against GPTZero, CopyLeaks, Writer, Winston AI, Turnitin, and Originality AI first, then offers Manual or Auto-Perfect rewriting with its Undetect V3 model trained on a 1B-token corpus. That detect-then-fix loop targets students, SEO writers, and marketers who need to see detector scores before paying for a rewrite.

Freelance writers, content marketers, SEO specialists, and students submitting AI-assisted drafts are the core audience. The site reports 300,000+ users and offers file uploads (.txt, .md, .pdf, .docx up to 10MB), rewrite history, and a REST API for teams embedding humanization into their own workflows.

CustomWritings runs a free AI detector inside its HowToWrite hub where students can paste text or upload DOC, TXT, PDF, and PowerPoint files to see what share of a paper looks machine-written. The checker returns an overall percentage and color-codes passages as likely or highly likely AI output, then lets you download a PDF report. It also ships as a browser extension for checking page content without leaving the site you are on.

Most standalone detectors sell themselves as neutral scanners. This one is built by an essay writing company that has offered academic help for 20 years and added combined AI and plagiarism screening to its own order checks in 2023. That parent service context shows up in the framing: the tool targets students who want to self-check before turning work in, not enterprise teams auditing marketing copy. The trade-off is independence, but the upside is a detector sitting next to free plagiarism, citation, and writing guide tools on the same domain.

Students prepping assignments, teachers reviewing suspicious submissions, and writers who lean on grammar tools all have reason to run a pass here. The FAQ notes that heavy grammar assist and stiff, template-like phrasing can sometimes trip the model even on human drafts, so shorter pieces under roughly 275 words may return less reliable scores than a full essay page.