The short answer
NoLLMWM and Undetectable AI are not two versions of the same product. NoLLMWM inspects plain text for physical Unicode controls, lets you remove the ones you select, and offers an optional authorized rewrite that changes wording. Undetectable AI sells a humanizer: you submit AI-generated text, it rewrites the text, and its marketing promises that the result passes AI detectors.
That difference decides the purchase. If the document contains invisible characters, a local scan can show you the exact code points and remove them without touching a visible word. If the concern is a statistical token watermark or a detector score, no Unicode cleanup changes the visible token sequence, and a rewrite may change it without any guarantee about an official verifier. Choose by the evidence you actually have, not by the outcome you want.
What each tool actually changes
A physical Unicode marker is a character: a zero-width space, a word joiner, a bidirectional control, a variation selector, or a tag character. It can be enumerated exactly, and deleting it is deterministic. The trade-off is that some of these characters have legitimate jobs in emoji sequences, mixed-direction text, and line breaking, which is why a scanner should report context instead of deleting everything it finds.
A statistical watermark is a pattern in the visible token sequence, produced while a model generated the text. There is no hidden character to delete. A compatible detector with the right key can test whether the pattern appears more often than chance; an independent tool without that verifier can only say the status is unknown. A humanizer changes the words, which may change the statistical evidence, but the change is a rewrite with its own semantic risk.
NoLLMWM is explicit about this split: local Unicode inspection and selective cleanup are free, and rewriting is optional, limited to text you are authorized to edit. Undetectable AI's published positioning is the opposite emphasis: rewrite the text so that it reads as human-written and passes detector checks. Both can be legitimate for different jobs. They are not interchangeable.
Published prices and units side by side
The table uses each vendor's public pages, read on 2026-10-21. NoLLMWM bills rewrite characters by submitted source length; Undetectable AI bills words per month. Characters and words are different units, so the totals below are not a like-for-like price comparison.
| What you compare | NoLLMWM | Undetectable AI | StealthGPT |
|---|---|---|---|
| Primary mechanism | Local Unicode scan and selective cleanup; optional authorized rewrite | Rewrites submitted text (humanizer) | Rewrites submitted text (humanizer) |
| Physical Unicode removal | Yes, exact code points with context | Not the stated focus | Not the stated focus |
| Billing unit | Rewrite characters, based on source length | Words per month | Plan; no per-plan price on the page read |
| Free entry | Local scan and cleanup free; 2,000 lifetime rewrite characters after signup | 250-word free trial | $1 for 3 days offer |
| Entry paid plan | Essential $12/month or $115/year for 100,000 characters/month | 10K words/month $9.99, or $60/year | Not published on the page read |
| Higher tiers | Pro $29/month or $278/year for 500,000; Scale $79/month or $758/year for 2,000,000 | 20K words $19; 35K $31; 50K $42.50 per month | Pro, Samurai and Enterprise names without published rates |
| Detector claim | No bypass claim; unsupported result reported as unknown | “Passes AI detectors” | “Bypasses AI detection” |
| Best for | Text you may clean, and authorized editorial rewriting | Paraphrasing text when detector outcome is the goal | Paraphrasing text when detector outcome is the goal |
Undetectable AI: what the published pricing buys
Undetectable AI's pricing page lists four humanizer allowances. 10,000 words per month is $9.99, or $60 charged annually and displayed as $5.00 per month. 20,000 words is $19.00, or $114 annually at $9.50 per month. 35,000 words is $31.00, or $189 annually at $15.75 per month. 50,000 words is $42.50, displayed at $21.25 per month with annual billing, and its page does not state the annual total. A Business tier is custom-priced with non-expiring credits.
The same page states a 250-word free trial and a refund promise: if anything the service produces is flagged as not human, it says it will refund the cost of humanization. Its feature list claims “Passes AI detectors”, “Watermark and future proof”, writing-level matching, and API compatibility. Those are the vendor's claims. This page does not repeat them as measured results, and it does not treat a detector score as proof of authorship.
StealthGPT and Phrasly: the same category, less price transparency
StealthGPT's home page calls its product an “AI Humanizer” that “bypasses AI detection” and says humanization “strips Claude and Gemini watermarks automatically”. It advertises a $1 three-day offer, 15% off a first monthly subscription, and 99 cents for a student's first month. The page read for this comparison did not publish per-plan subscription rates, so no plan price is quoted here.
Phrasly's pricing page advertises a free start and a yearly discount of up to 60%, but it does not publish monthly or annual prices in the page content read on 2026-10-21. It claims its output “passes authenticity checks” and that its models were trained on 500,000+ real human articles. Without a published rate, it cannot be placed in a price comparison; it belongs in the same paraphrase-first category as the other two.
NoLLMWM: what the published pricing buys
NoLLMWM's free tier is not a trial of the rewrite. The Unicode inspector and selective cleanup run in the browser and need no account, so locating physical controls costs nothing. Creating an account adds 2,000 lifetime rewrite characters. Essential is $12 per month or $115 per year for 100,000 characters per month; Pro is $29 per month or $278 per year for 500,000; Scale is $79 per month or $758 per year for 2,000,000 and adds bearer-key API access with up to five active keys. A one-time 100,000-character pack is $12 and is consumed after the included balance.
Character use is based on the submitted source length, and the output is not billed again. Local scanning and cleanup do not consume rewrite characters because that work stays in the browser. Rewrites are sent to the configured provider, and the application does not persist the source or the output in its database. A failed provider request is refunded automatically. The product does not sell a detector verdict, and it does not promise that a rewrite will pass an unavailable official verifier.
Why a humanizer is the wrong tool for a Unicode problem
If the text contains a zero-width space between two letters, a humanizer may paraphrase the sentence and leave a different invisible character somewhere else, or introduce new ones. You paid for words you did not need to change, and you still have to inspect the result. A local scanner answers the physical question directly: which code points are present, where, and whether removing them would break an emoji sequence or a bidirectional run.
The reverse is also true. If the visible words themselves must change, a cleaner cannot help. Deleting invisible characters does not paraphrase a sentence, reduce a statistical pattern, or improve a detector score in any way the product can verify. Buying a cleaner for a rewriting job is the same mistake in the other direction.
A five-minute test that separates the two jobs
Save a copy of the document. Run it through a local Unicode inspector and look at the report before changing anything. If the scan finds supported physical controls, clean only the ones you understand, then compare the visible text with the original. If the scan finds nothing and your concern is detector evidence, you have a different problem, and a rewrite is the only one of these two products that addresses it at all.
If you decide to rewrite, submit a passage you own or are authorized to edit, keep the original, and compare meaning, names, numbers, and disclosures line by line. Treat the result as an editorial revision, not as a certificate. For a statistical watermark, ask the vendor whether an official verifier exists and whether you can run it; if the answer is no, the honest status is unknown.
- Inspect physical characters before rewriting anything.
- Remove only the code points whose context you understand.
- Rewrite only text you are authorized to transform.
- Compare the visible text, not just the detector badge.
- Keep the original and record which tool and version produced the result.
What neither tool can promise
Neither product can prove who wrote a document, whether its claims are true, or whether a particular detector will flag it tomorrow. Detector models change, thresholds change, and a rewrite that passes one check may fail another. A physical scan is reproducible because two correct tools should agree that a code point exists; a statistical or classifier result is an inference with an error rate.
That is why NoLLMWM reports physical findings and unavailable statistical evidence separately, and why its copy avoids “undetectable” as an outcome. If a vendor promises a detector result, read the refund terms and the sample requirements before paying. If a vendor promises a Unicode cleanup, verify that it preserves emoji and bidirectional text. The useful question is not which product is stronger in the abstract, but which evidence your document actually contains.
Frequently asked questions
Is NoLLMWM an Undetectable AI alternative?
Only for the narrow case where you need an authorized rewrite of text you own. NoLLMWM is built around local Unicode inspection and selective cleanup, and its rewrite is optional. Undetectable AI is a humanizer whose marketing centres on passing AI detectors. If your document contains invisible characters, NoLLMWM addresses that directly; if your goal is paraphrased text, a humanizer is the closer product.
Does NoLLMWM bypass AI detectors?
No such claim is made. The free local scan finds physical Unicode controls and can remove the ones you select. A statistical watermark in the visible token sequence is not removed by deleting characters, and the product does not show an official detector score. When the evidence is unavailable, the honest result is unknown.
How much does NoLLMWM cost?
Local inspection and cleanup are free. An account starts with 2,000 lifetime rewrite characters. Essential is $12 per month or $115 per year for 100,000 characters per month; Pro is $29 or $278 for 500,000; Scale is $79 or $758 for 2,000,000 with API access. A one-time 100,000-character pack is $12.
How much does Undetectable AI cost?
Its pricing page lists 10,000 words per month at $9.99 or $60 per year, 20,000 at $19.00 or $114 per year, 35,000 at $31.00 or $189 per year, and 50,000 at $42.50 with annual billing displayed as $21.25 per month. The free trial is limited to 250 words.
Can I just delete zero-width characters myself?
Often yes, but context matters. A zero-width joiner can be part of an emoji sequence, and bidirectional controls can make mixed-language text readable. A scanner that reports position and context lets you remove the residue you do not need without breaking the text that depends on it.
Will rewriting remove a statistical watermark?
It may change the token sequence that a statistical detector looks for, but that is not the same as removing a watermark, and it cannot guarantee an official verifier's result. Any rewrite also changes the work and can introduce errors. Keep the original and compare meaning before publishing.