ThesisDraft vs. Undetectable.ai: Why We Do Not Sell a Humanizer

Two Different Products, Not Two Versions of One

Undetectable.ai is a humanizer. Its purpose is to rewrite machine-generated text so that detectors score it differently, and it bundles a detector aggregator alongside so you can watch the scores move.

ThesisDraft’s AI check is a check. It tells you what a detector sees in a document, publishes how often that verdict is wrong about a human, and stops there.

This page exists because students search for both, and because we would rather answer the question directly than let the comparison be made by someone with a rewrite to sell. We do not offer a humanizer, we are not planning to, and the reasoning is below rather than left implied.

Side by Side

Why We Do Not Sell a Humanizer

The honest reason is not squeamishness. It is that the two products cannot coexist without destroying the value of the one we actually have.

What we sell is a check both sides can trust: the same tool, the same verdict and the same error rate go to the student before submission and to the examiner afterwards. That symmetry is the entire product. It is also the only reason we can publish a false-positive rate at all — a tool whose business depends on beating detectors has no commercial reason to tell you when detectors are wrong, and every reason to tell you they are always wrong.

Put plainly: a company selling both the alarm and the way around it is not a company whose alarm you should trust. We would rather keep the alarm credible.

There is also a plainer version. Our customer is a worried 20-something writing in a second language who mostly wants to be told they are fine — and in most cases they are. That is a different person from someone shopping for a way to submit work they did not write, and we would rather serve the first one well.

What a Rewrite Does Not Fix

Suppose the rewriting works exactly as advertised and the score drops. Here is what is unchanged:

• The declaration of authorship. Submitting a thesis under a declaration that you wrote it is the binding act. No detector score is party to that document, so no detector score resolves it.
• The viva. Being asked why you chose that method, what the limitation in section 4 implies, or where a figure came from. Rewritten text does not teach you the answer.
• The argument. A humanizer changes wording. It does not change which points arrive in which order, what is cited where, or whether the reasoning holds — which is what a supervisor reads.
• Terminology. Synonym substitution reliably breaks technical vocabulary, and a supervisor notices a thesis that has started calling the same construct three different things.
• Time. Detector vendors retrain against rewriting tools continuously. Whatever works this month is a moving target by construction, and your submission date is not.

What Our Writing Polish Actually Does

We do offer polish, and the boundary matters. It removes filler, hedges and tired transitions — “it is important to note that”, “in today’s world”, the fourth “moreover” on a page. That is what a good writing centre would strike, and striking it makes a thesis better to read whether or not any detector is ever pointed at it.

What it does not do is disguise authorship. If a document is largely machine-written, the honest answer is that rewording will not fix it, and that is what we return. Saying so costs us a sale on precisely the customers who most want to give us money, and it is the only version of this business worth running.

If You Have Been Flagged and You Wrote It

This is the situation a humanizer advertises to and cannot help with, because you do not need different words — you need evidence.

• Drafts with timestamps, and your document’s version history.
• Notes, reading, and the dead ends that did not make it into the final text.
• The published error rates of detectors, which is one reason our accuracy page exists in citable form: about 3 false positives in 100 for English over 400 words, 4 in 100 for German, and no strong verdict at all on short German text.
• Your own ability to talk through the argument, which is usually the thing that settles it.

Our guide on what to do when a detector flags your thesis works through the response in order. Rewriting the text after an accusation is, if anything, the worst available move.

The Verdict

These are not competing products and we are not going to stage a contest. One rewrites text so a number changes. The other tells you what the number is and how often it is wrong.

If you wrote your thesis, the second one is what you need, and the first 1,500 words cost nothing. If you did not write it, we are not the shop for that, and we would rather say so on the page than in the small print.

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