AI Detector By Custom Writings vs GPTinf

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.

GPTinf bundles six writing utilities on one site: an AI detector, humanizer, plagiarism checker, paraphraser, readability scorer, and grammar checker. You can paste or upload text, run detection across eight systems with segment-level highlights, then rewrite in one of eight humanizer modes while locking terms with Freeze. The platform markets itself to students, freelancers, and marketers who need drafts cleaned before submission or publishing.

Most humanizers only shuffle words at the surface. GPTinf contrasts its Steel engine with lighter LLM rephrasing by rebuilding sentence rhythm and targeting signals detectors scan, while its Feather-style approach is described as leaving patterns exposed. Published stats claim under 5% average AI scores after humanization and 37% better detection results than unnamed competitors, with 15 billion plus words processed.

Paid tiers cap humanizer and paraphraser word counts, but the AI detector stays free with unlimited checks on every plan. Lite starts at $4.99 per month for 5,000 humanizer words, Pro raises quotas to 25,000 words, and Unlimited removes caps entirely. Readability scoring uses Flesch-Kincaid levels, and plagiarism hits link back to matched URLs for manual review.