undetectable.wtf vs AI Detector By Custom Writings

undetectable.wtf is a browser-based AI humanizer that takes drafts from ChatGPT, Claude, and similar writers and reworks them so common detectors flag less often. You paste up to 15,000 characters into the homepage editor, pick Rewrite or Cryptography mode, and run output against tools like GPTZero, Turnitin, and ZeroGPT. The site lists a 98% bypass success rate and a 4.9/5 rating from 2,300+ users.

Most humanizers only paraphrase. undetectable.wtf also ships Cryptography mode, which swaps in Unicode homoglyphs and zero-width characters so the text looks unchanged to readers while breaking detector pattern matching. That is a different trade-off than rewrite-only services, and both modes here count against monthly essay quotas rather than offering unlimited character processing.

Students, freelance writers, and research assistants use it when AI-assisted drafts need to clear school or client checks. Signup includes a 3-day trial with 2 essays and no credit card. Paid Standard and Pro tiers raise the monthly essay cap, and Pro unlocks input limits up to 2x Standard capacity.

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.