Skip to content
October 2026 results: WriteHuman holds #1, StealthGPT jumps to #2. Read the analysis →
HumanizerBench
Not in the current cycle. Data shown is from cycle September 2026, the most recent cycle where both Penlify and StealthBypass were tested together.

Head to head · September 2026 cycle

Penlify vs StealthBypass

StealthBypass finished 2.8 points ahead of Penlify in the September 2026 cycle, 39.38 to 36.57, ranking #13 against #14 in a field of 14. StealthBypass scored higher on 5 of 5 detectors and 2 of 7 writing categories. Penlify came out ahead on penalties (−5.0 vs −23.0), meaning preservation (62.7 vs 39.5) and marketing copy prompts (38.8 vs 18.9).

36.57 /100
overall score
#14 /14
rank -
+2.81
StealthBypass leads →
Detectors
0 – 5
Categories
5 – 2
Components
4 – 1
39.38 /100
overall score
#13 /14
rank -

33 prompts · Last tested · Methodology v1.2.0

Score components

What the overall score is made of: bypass rate weighs 42%, meaning preservation 32%, readability 16%, consistency across categories 10%. Output-quality penalties come off the total. How scoring works →

Bypass rate StealthBypass by 78.6
0.0 78.6
Meaning preservation Penlify by 23.3
62.7 39.5
Readability Penlify by 17.8
71.8 54.1
Consistency Penlify by 19.3
100.0 80.7
Penalties fewer is better Penlify by 18.0
−5.0 −23.0

Detector by detector

Share of each tool's outputs that a detector classified as human-written. StealthBypass took 5 of 5.

GPTZero StealthBypass by 69.3
0.0 69.3
Originality.ai StealthBypass by 58.5
0.0 58.5
Copyleaks StealthBypass by 65.1
0.0 65.1
Winston AI StealthBypass by 55.9
0.4 56.3
ZeroGPT StealthBypass by 41.3
43.0 84.4

Writing categories

Category score per writing context: bypass credit only for real rewrites, blended with the category's own meaning preservation and readability. Small categories swing; the prompt count is shown on each row. How category scores work →

Academic Essay Application Essay Blog Post Business Email Marketing Copy Discussion Board News Article Academic Essay: Penlify 27.0 · StealthBypass 39.9 Application Essay: Penlify 35.9 · StealthBypass 24.5 Blog Post: Penlify 37.3 · StealthBypass 28.2 Business Email: Penlify 39.9 · StealthBypass 26.0 Marketing Copy: Penlify 38.8 · StealthBypass 18.9 Discussion Board: Penlify 32.1 · StealthBypass 42.8 News Article: Penlify 36.6 · StealthBypass 35.3
Penlify StealthBypass Outer ring = 100
Academic Essay 6 prompts StealthBypass by 12.9
27.0 39.9
Application Essay 6 prompts Penlify by 11.3
35.9 24.5
Blog Post 6 prompts Penlify by 9.0
37.3 28.2
Business Email 3 prompts Penlify by 13.9
39.9 26.0
Marketing Copy 6 prompts Penlify by 20.0
38.8 18.9
Discussion Board 3 prompts StealthBypass by 10.7
32.1 42.8
News Article 3 prompts Penlify by 1.3
36.6 35.3

Where each one wins

Every measure above that one tool won outright, largest margin first within each group.

Penlify

9 wins
  • Penalties Score −5.0 vs −23.0
  • Meaning preservation Score 62.7 vs 39.5
  • Consistency Score 100.0 vs 80.7
  • Readability Score 71.8 vs 54.1
  • Marketing Copy Category 38.8 vs 18.9
  • Business Email Category 39.9 vs 26.0
  • Application Essay Category 35.9 vs 24.5
  • Blog Post Category 37.3 vs 28.2
  • News Article Category 36.6 vs 35.3

StealthBypass

8 wins
  • Bypass rate Score 78.6 vs 0.0
  • GPTZero Detector 69.3 vs 0.0
  • Copyleaks Detector 65.1 vs 0.0
  • Originality.ai Detector 58.5 vs 0.0
  • Winston AI Detector 56.3 vs 0.4
  • ZeroGPT Detector 84.4 vs 43.0
  • Academic Essay Category 39.9 vs 27.0
  • Discussion Board Category 42.8 vs 32.1

Same prompt, both outputs

Both tools were given this AI-written passage in the September 2026 cycle. Below it is what each one returned. This prompt was picked by a fixed rule, not by how the tools scored.

Personal Statement · Application Essay · written by Claude Sonnet 5 · 361 words

# Personal Statement: Industrial Design

Every object around us tells a story about the person who designed it—their assumptions, priorities, and understanding of human need. This realization struck me the first time I disassembled a broken kitchen appliance as a teenager, not to fix it, but simply to understand why it had been built that way. That curiosity has never left me; it has only sharpened into a genuine passion for industrial design.

What draws me to this field is the unique intersection it occupies between creativity and problem-solving. Industrial design is not merely about making things look appealing—it is about understanding people deeply enough to create objects that improve their daily lives in ways they may not even consciously notice. A well-designed chair supports the body without the user thinking about ergonomics. A well-designed tool feels natural in the hand because someone considered grip, weight, and movement before the user ever picked it up. This invisible thoughtfulness fascinates me, and I want to be the person responsible for creating it.

Over the past two years, I have pursued this interest through independent projects, including redesigning a foldable desk organizer for small apartments and prototyping a more accessible measuring cup for individuals with limited hand mobility. These projects taught me that good design requires empathy as much as technical skill—understanding not just how something should function, but who it is for and what challenges they face. I found myself energized by the iterative process: sketching, building, testing, failing, and refining. Rather than discouraging me, each failure clarified what the object truly needed to become.

I am also drawn to industrial design because it sits at the crossroads of art, engineering, psychology, and sustainability. I want to learn how materials behave, how manufacturing processes shape possibilities, and how design decisions impact environmental and social systems. Studying industrial design will give me the technical foundation and creative discipline to transform my curiosity into responsible, human-centered solutions.

Ultimately, I want to design objects that quietly make life better—products that anticipate needs, reduce friction, and reflect genuine care for the people who use them. Pursuing this degree is the next essential step toward that goal.

Show the full input

386 words (input 361)

I still remember the first time I ripped a busted kitchen gadget apart, not to fix it, but just to see why the parts fit the way they did. That teenage curiosity never left me; it turned into a quiet obsession with how everyday things are born. I'm drawn to industrial design because it sits between making something look good and actually solving a problem. A chair can hold you up without you ever thinking about posture, and a screwdriver feels right in your hand since someone considered weight and grip before you grabbed it. Those invisible decisions keep me up at night, wondering who decided they should exist. For the past two years I've chased that question on my own, honestly. I took a tiny fold‑out desk organizer, re‑imagined it for a studio apartment and printed a prototype; it actually slid into a narrow hallway shelf. Next, I built a measuring cup with a larger handle and a tactile lip for people whose hands don't close fully, something I saw a friend struggle with while baking. Each project reminded me that design isn't just about picking the right material; it's also about feeling what another person experiences. Sketches became cardboard, the cardboard a busted test, and that test a new idea, often after three days of failure before the shape finally clicked. I'm also drawn to the fact that this work sits on the edge of art, engineering, psychology and even the planet's health. I wonder how a polymer melts under pressure. I also ask what a factory's waste stream looks like when you change a mould. Those questions make me want to dig into material science and production methods, since the choice of a screw or a recycled composite can change a product's story for better or worse. Ultimately I'd like to create things that slip into people's lives without shouting for attention, a mug that stays warm just long enough, a lamp that dims when you're tired, a tool that feels like an extension of the hand. Getting a degree in industrial design feels like the next logical step, the bridge between my DIY experiments and the kind of work that actually reaches a shelf. And maybe, someday, someone will open a box and never think about the design, because it simply works.

Show the full output
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.45caught
  • Copyleaks0.00caught
  • Originality.ai0.00caught

Passed 0 of 5 detectors.

Every Penlify run in September 2026 →

384 words (input 361)

Personal Statement - Industrial Design Every object that surrounds us speaks to the mindset of the person who created it—their assumptions, priorities, and grasp of human necessity. This awareness coalesced the first time, as a teen, I dismantled a defunct kitchen appliance. Not to repair it, but just to understand why it had been built the way it had. That impulse never left me, it’s only intensified into a passionate curiosity in industrial design. This is what attracts me to the field: the potent and distinct meeting place of imagination and logic. Industrial design isn’t simply about aesthetic form—it’s about delving into the heart of people and producing the tangible results that subtly elevate the quality of their daily lives. A chair designed well does more than look attractive; it actively supports and caresses the body without you having to consider its ergonomics. Tools that sit comfortably in the hand have already taken into account aspects like form, weight, and interaction. I am endlessly fascinated by this kind of thoughtful nuance, and I want to be responsible for its creation. Over the last two years, I’ve nurtured this curiosity in independent projects: designing an innovative folding desktop organizer for small spaces, and even prototyping an adapted measuring cup that better caters to the challenges faced by those with limited hand mobility. These projects have confirmed for me that successful design requires not only technical skill, but a deep understanding of human need, as well as the sensitivity to approach this through an empathetic lens. It is during these experiences of brainstorming, sketching, building, testing, failing, and reiterating where I feel most engaged—each setback clarifying the direction toward which an object should progress. Furthermore, the collaborative, interdisciplinary nature of industrial design is particularly compelling. I am eager to explore material science and manufacturing limitations, but also to examine the psychology of product use and the broader implications for sustainability and social well-being. Receiving a degree in industrial design will provide me with the necessary expertise and a rigorously creative framework for turning my inquisitive nature into impactful, human-centric designs. I desire to create objects that, in their quiet competence, reduce friction, fulfill unmet needs, and demonstrate a thoughtful regard for their users. To achieve that end, this degree is the natural and vital next step.

Show the full output
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.45caught
  • Copyleaks0.00caught
  • Originality.ai0.00caught

Passed 0 of 5 detectors.

Every StealthBypass run in September 2026 →

Each chip is one detector's score for that output, from 0 (AI) to 1 (human). A score of 0.50 or higher counts as a pass and shows green; below that the detector caught it and the chip shows red.

Questions people ask

Is Penlify better than StealthBypass?

StealthBypass finished 2.8 points ahead of Penlify in the September 2026 cycle, 39.38 to 36.57, ranking #13 against #14 in a field of 14. StealthBypass scored higher on 5 of 5 detectors and 2 of 7 writing categories. Both tools ran the same 33 prompts, scored by the same 5 detectors, under methodology v1.2.0; every input, output and verdict is published.

Which bypasses AI detectors better, Penlify or StealthBypass?

StealthBypass posted the higher bypass rate, 78.6 vs 0.0, and scored higher on 5 of 5 detectors. StealthBypass led on GPTZero, Originality.ai, Copyleaks, Winston AI and ZeroGPT.

Do Penlify and StealthBypass keep the original meaning?

Penlify preserved meaning better, 62.7 vs 39.5 on our 0–100 similarity scale. On readability, Penlify rated higher, 71.8 vs 54.1. Penalties this cycle: Penlify −5.0, StealthBypass −23.0.