How it works
AI undresser, nudifier, generator: the three steps behind one button
One button on the surface, three jobs underneath: find the body, cut out the clothing, repaint what was covered. That is also where every visible flaw comes from.
Short answer
An AI undresser does three jobs behind one button: a detector marks the figure and the edge of the clothing, the marked area is cut away, and a generative model paints a new body into the gap and blends the seam. Nothing is uncovered at any stage — what the fabric hid was never in the file — so the result is an invention fitted to the pose. That is also why the meter runs per attempt rather than per keeper, and why two runs on the same photograph never match.
The same three steps sit behind every name in the category, whatever it is advertised as: the services running this pipeline.
One button, three jobs
What an AI undresser actually runs after the click
Each step can fail on its own, and each one is paid for whether it succeeds or not.
Find the body
A detector locates the figure, the pose and the boundary of the clothing. It runs on the operator's hardware rather than yours, which is where the file's journey begins: the step before your file reaches the model.
Cut out the marked area
The clothed region becomes a mask — a hole in the picture. Everything the fabric covered goes with it, because none of it was ever recorded.
Repaint the hole
A generative model fills the mask with a body assembled from its training data and blends outward from the seam. It is working from the outline, which is why the same picture comes back different every time.
Per attempt, not per result
Four units, the same three steps underneath
The unit a service sells is worth reading before the number attached to it, because the four are not comparable until you convert them to one run.
A balance you buy
Gems and credits, spent per run and never expiring.
- Undresswith: 100 to 110 gems a picture, about US$0.06, from a 33,000-gem pack at US$19.99;
- Ainudez: 15 credits a picture, about US$0.30, from 500 credits at US$9.99;
- both publish the ladder outside the account, so the cost of three attempts is known in advance.
A price per execution
WaveSpeed bills each run on its own, with no pack and no monthly fee.
- US$0.005 to US$0.14 a picture, depending on the model chosen;
- US$0.01 to US$0.15 a second on the video side, which is the same meter at a finer grain;
- US$1 arrives with the account, so the first few attempts cost nothing.
A window of access
Deep Undress sells time instead of runs: five lengths, each bought once.
- extras come out of an internal balance — a queue jump is three units;
- the result stays available for seventy-two hours after it is made;
- for a run of heavy use this is the cheaper shape; for one picture it is the dearer.
The fourth unit is a coin: UndressHer sells them in one purchase and opens the tariff inside the account, with 14 calendar days to ask for the money back. Pornworks puts the clip first and keeps its conditions for the inside too. All six places, with what each publishes first: where each tool lands in the ranking.
Same pipeline, different counters
Three that tell you what a run costs first
The three steps are the same everywhere; what changes is whether the price of one attempt is readable before you start. The editors compared the conditions each publishes in .
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1Cheapest per attemptPhoto and videoUndresswith
About six cents a run, so three attempts at one picture cost less than twenty. The gem ladder is public, the pack of 33,000 gems at US$19.99 is roughly 300 runs, and the upload is deleted after twenty-four hours. A new account opens with 100 gems, one attempt included.
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2Priced per runPhoto and videoWaveSpeed
Rents out the models themselves and prints a unit price for each: US$0.005 to US$0.14 a picture and US$0.01 to US$0.15 a second of video, with no pack to buy into. Visa, Mastercard, American Express, PayPal and transfers are accepted, and the terms name two registered companies, one of them in Hong Kong.
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3Counts every generationPhoto and videoAinudez
15 credits a picture out of 500 for US$9.99, and it says plainly that every generation is billed, a corrective re-run included — which is the honest version of how all six work. Clips run 50 to 300 credits up to 720p and seven seconds, nothing renews by itself, and a complaint is answered within five working days.
The “Open site” buttons are advertising links: pay on the other side and this desk earns a commission, at no extra cost to you and with no effect on the order. Nothing here measures output — no outsider can, and this desk does not run pictures of real people to try: how each of these claims was checked.
Where it shows
The same details give a repaint away every time
Repainting is guesswork at the edges, and the edges are exactly where a viewer looks.
Where it slips
The failures are structural rather than occasional, and knowing them saves attempts.
- hands, fingers and anything crossing the body, because the mask cuts through them;
- straps, seams and jewellery that stop in mid-air where the repaint begins;
- patterned or draped fabric, which the detector reads as part of the body;
- more than one person in frame, or a pose the detector has no template for.
What no amount of paying changes
Four limits belong to the method rather than to the price list.
- nothing can be recovered that was not in the photograph, because it is not there to recover;
- no two runs match, since the fill is generated fresh each time;
- a small, soft or heavily compressed picture stays that way;
- a repaint drifts between frames, which is why clips are harder than photos and cost about twenty times as much.
A convincing result is not a legal position either: an altered picture of someone recognisable sits inside the Hong Kong definition of an intimate image — whether an altered image counts is settled in the wording itself, and the route to take when the picture is of you is what to do when the picture is of you.
One process, four labels
Undresser, nudify, generator, remover
The vocabulary changes with the advertising. The three steps underneath do not, and neither does where they run.
The words
All four names describe the same detect-mask-repaint chain.
- “undresser” and “remover” suggest something is taken away, when something is added;
- “nudify” describes the output rather than the method;
- “generator” is the accurate one of the four — the picture is generated;
- none of them tells you whose servers the work runs on, which is what the scores measure.
Where the model runs
Not on the device, whichever package the name arrives in.
- the file is uploaded, processed remotely and sent back — a handset could not do this work;
- a fast answer means a short queue somewhere, not a small model locally;
- the plainest version of the arrangement is the browser front end for the same model;
- an icon on the home screen changes nothing about it: the same model inside an app.
A chat bot is the fourth door into the same three steps, and the only one that publishes no price, no company and no deletion period — the processing is bought in small packets and paid for in Telegram Stars, which Telegram sells and does not refund: which model the bots call is a question nobody in that arrangement answers. On everything else in this category the answer is dull and identical: a detector, a mask, a repaint, and a balance that comes down by one whether you keep the picture or not.