"Humanize your essays with HIX Bypass and you teacher will never have a chance to flag your writing as AI-generated even if write it yourself." That sentence, grammatical errors and all, is live on a commercial website right now. It is not satire. It is a sales pitch — one of hundreds in a mature subscription industry that sells exactly one product: making cheating invisible.

In our previous article we explained how AI paraphrasing slips past classic plagiarism checkers. This piece is about who is selling that bypass, and how openly.

The receipts

The category no longer hides behind euphemism. BypassGPT lists "Bypass Originality.ai Turbo 3.0," or "Remove ChatGPT Watermarks" as literal bullet points on its pricing page. StealthGPT offers a "money back guarantee if you can prove you've been detected on an assignment." Netus AI claims a 99.97% success rate against "GPTZero, Originality.ai, ZeroGPT, Turnitin, CopyLeaks, Winston AI." JustDone - which inspired this article - markets an "AI Plagiarism Remover" in the same interface as its plagiarism checker, trusted, they say, by "students from 3,000+ leading universities." Lastly, the widely used service Grammarly very openly advertises to help disguising plagiarism.

This is not a fringe. Online data (also see honorable mentions) counts 33.9 million visits to humanizer sites in October 2025 alone, across 150+ tools. Undetectable AI alone displays a counter past 23 million users. The standard price is between $9.99 and $30 a month — the cost of a streaming service. That pricing is the tell: evasion-as-a-service is now a mass-consumer category. Have a look at our research report for a detailed overview.

The pitch they could have chosen

The same underlying technology could have been sold honestly: "write better, learn faster, check your work before you hand it in." QuillBot built a real business on roughly that framing — it even ships its own AI detector. Every other vendor in this list looked at that option and picked a different one. They chose "we help you hide" because it converts better. That is a marketing decision, not a technical constraint. Students deserve to know they are the target of that decision, not the beneficiary of it.

Honorable mentions

Two journalists have done more than anyone else to document this industry. Derek Newton's The Cheat Sheet is the steady analytical chronicle — he successfully pressured Grammarly to stop labeling humanized text as "Typed by a Human." Joseph Thibault's This Isn't Fine is the activist counterpart — his "Takedowns" series walks readers through reporting specific cheating ads on Google, Meta, and Reddit, and has already helped get a major essay-mill subreddit banned. If you teach, you should subscribe to both.

What Mentafy S³ changes

Humanizers work by swapping words and restructuring sentences until a string-matching or stylometric detector loses the scent. S³ (Semantic Source Search) does not look at strings. It reads for meaning — the way an experienced reviewer does, at scale, on every submission:

• Semantic embedding. Text is analysed as a vector of meaning, not a sequence of characters. Synonyms and structural rewordings stay visible.
• Global section analysis. S³ compares whole paragraphs and chains of argument — not isolated sentences. That is precisely the level at which humanizers operate, and therefore precisely where they give themselves away.
• Source alignment and evidence. When S³ identifies a passage, it places the submission and the original source side-by-side, so educators see what was borrowed, not just a percentage.

The tools above are priced by the month. Mentafy S³ makes that subscription worthless. And it gives students a better reason to write their own work: because this time, their own thinking is what actually shows up on the page.