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HumanizerBench

← August 2026 prompts

Product Desc · Gemini 3.5 Flash

Marketing Copy · written by Gemini 3.5 Flash · 182 words · prompt product_desc

8
passed at least 4 detectors
9
failed at least one detector
12
tools tested on this prompt
GPTZero
hardest detector, caught 6 of 12

Input passage

Generated by Gemini 3.5 Flash; this exact text was pasted into every humanizer below.

Meet your new hydration essential: the ultimate Stainless-Steel Insulated Water Bottle. Engineered for the modern adventurer, daily commuter, and fitness enthusiast alike, this bottle combines sleek aesthetics with powerhouse performance. Crafted from premium, food-grade 18/8 stainless steel, it is 100% BPA-free, rust-resistant, and built to withstand life’s daily bumps without transferring flavors. Thanks to its advanced double-wall vacuum insulation, your drinks stay ice-cold for up to 24 hours or piping hot for 12. Say goodbye to annoying condensation—the sweat-free exterior ensures a firm, dry grip no matter how cold your beverage is. Designed with convenience in mind, it features a leak-proof, airtight lid that seals in freshness and prevents spills in your bag. The wide-mouth opening allows for effortless ice cube addition and hassle-free cleaning, while the integrated carry loop makes on-the-go transport a breeze. Available in a variety of vibrant, powder-coated finishes that resist scratching and fading, this eco-friendly bottle is as stylish as it is durable. Make the sustainable choice, eliminate single-use plastics, and experience pure, refreshing hydration wherever life takes you. Your perfect sip is just a twist away.

How to read these scores

Each detector returns a human-likelihood on a common 0 to 1 scale, where 1 means it judged the text human-written and 0 means it flagged it as AI. On these pages a verdict counts as passed when that score is at least 0.50, the midpoint of the detector's own scale. That threshold exists only to draw the chips: the bypass rate on the leaderboard is the mean of each test's median score across the 5 detectors, a continuous number, so a tool's pass count and its bypass rate will not be the same figure.

Meaning is the input↔output embedding cosine and readability is a language-model writing-quality rating, both published per test in tests.json. Words is the output's length as a multiple of the input's; the scoring code penalizes ratios above 1.40 or below 0.60. Full definitions live in the methodology.

Humanized outputs

Ordered by how many detectors each rewrite passed; ties fall back to this cycle's rank. Each block shows what the tool returned and how the 5 detectors scored it.

Humanize AI Pro

Rank #2 this cycle · run took 0:42

5/5 detectors passed
  • GPTZero0.98passed
  • Winston AI1.00passed
  • ZeroGPT0.60passed
  • Copyleaks1.00passed
  • Originality.ai0.99passed
Median
0.99
Meaning
92.7
Readability
62.0
Words
1.06× 182 → 193
Show output (193 words)

Introducing the next essential addition to your drinking experience: our top-quality Stainless-Steel Insulated Water Bottle. Tailored to meet the needs of modern-day adventurers, commuters and sports lovers alike, this water bottle brings a touch of elegance along with unmatched functionality. The premium quality food-grade 18/8 stainless steel is fully rust-resistant, 100% BPA free, will not transfer flavors, and is ready to withstand all life’s hardships. With help of its double wall vacuum insulation technology, this bottle can keep drinks cold up to 24 hours or hot up to 12 hours. There will be no more unpleasant sweating from your drink as its exterior will stay cold with no condensation. Convenience was at the core of its design. Leak-proof and airtight, this bottle has a tight-fitting lid that will ensure the freshness and safety of its contents and protect your stuff from any liquid spills. Wide mouth opening guarantees effortless cleaning and adding ice cubes. Durable and available in different colorful powder coated finishes that do not scratch and fade easily, it also brings some sustainability to our world by eliminating plastic bottles usage. Make a change and enjoy your life to the fullest.

Undetectable.ai

Rank #8 this cycle · run took 0:16

5/5 detectors passed
  • GPTZero1.00passed
  • Winston AI1.00passed
  • ZeroGPT0.91passed
  • Copyleaks1.00passed
  • Originality.ai1.00passed
Median
1.00
Meaning
82.9
Readability
45.0
Words
1.63× 182 → 297

Output is more than 1.4× the input length, penalized as length inflation.

Show output (297 words)

Stainless-Steel Insulated Water Bottle - The Hydration Bottle for the Active. The Stainless-Steel Insulated Water Bottle by S’well is the perfect hydration bottle for the very active individual. Take your new hydration bottle with you on your daily adventures, to and from work on your daily commute or to the gym with you as your new fitness buddy. Our Stainless-Steel Insulated Water Bottles are the ultimate in drinkware! Made from the highest quality food-grade 18/8 Stainless Steel. Our bottles are 100% BPA-free, and are rust-resistant ensuring they last for years to come. Our Bottles can withstand bumps, scrapes and drops along the way and will keep the temperature of your hot or cold drinks for up to 24 hours. This is all achieved by the Double-Wall Vacuum Insulation that keeps the interior of the bottle at the perfect temperature whilst the exterior stays sweat-free meaning no more water marks or droplets of water slipping from your hand and running all over the place. With everyday life becoming busier than ever, the Stainless-Steel Insulated Water Bottle has been designed with the user in mind. With the bottle being 100% leak proof, meaning your drink will not leak from the bottle whilst in your bag, the airtight lid also helps to keep your drinks fresh for longer. The large mouth hole allows for very large chunks of ice to be added to the bottle and the bottle itself is easy to clean. To top it all off the integrated carry loop means you can take your drink with you wherever you go. Eco-friendly stainless steel insulated water bottles that are as durable as they are stylish. Chose from a wide variety of colors to suit your personality and enjoy your perfect sip of fresh, sustainable water, anywhere you go.

Walter Writes

Rank #9 this cycle · run took 0:21

5/5 detectors passed
  • GPTZero1.00passed
  • Winston AI1.00passed
  • ZeroGPT0.84passed
  • Copyleaks1.00passed
  • Originality.ai0.99passed
Median
1.00
Meaning
92.1
Readability
55.0
Words
1.49× 182 → 272

Output is more than 1.4× the input length, penalized as length inflation.

Show output (272 words)

The Ultimate Hydration Companion - Introducing the Best Stainless Steel Insulated Bottle EVER! Whether you are an urban adventurer, a busy daily commuter, or a fitness enthusiast who is always "on the go", this water bottle has been designed with YOU in mind. This sleekly-designed bottle will provide you with years of trouble-free service and enjoyment. Made from top-quality 18/8 Food Grade Stainless Steel, this bottle is 100% free from BPA, Rust-Resistant, and engineered to withstand all of life's daily knocks and bumps without ever imparting flavors into your beverages. Its Double-Wall Vacuum Insulation provides ice-cold drinks for up to 24 hours, and piping-hot beverages for 12 hours. With the elimination of unwanted condensation, there will be no annoying wet spots on your hands when drinking out of this bottle, providing a firm and secure grip at all times. With the comfort of use as its main focus, the bottle includes a Leak-Free Airtight Lid which keeps your beverage fresh and prevents accidental spilling while carrying the bottle. In addition to being leak-free, the large mouth opening also allows for easy adding of ice cubes and simple cleaning. The Integrated Carry Loop makes transporting the bottle anywhere convenient and easy. The water bottle comes in a range of Vibrant Powder-Coat Finishes that are scratch-resistant and fade resistant. As a result, they will remain looking like new for years to come. Whether you choose one color or many colors (the possibilities are endless), this Eco-Friendly Water Bottle offers both style AND durability. Choose to make a Sustainable Choice today by eliminating Single-Use Plastics and enjoy Pure Refreshing Hydration anywhere your travels take you.

WriteHuman

Rank #1 this cycle · run took 0:18

4/5 detectors passed
  • GPTZero1.00passed
  • Winston AI1.00passed
  • ZeroGPT0.35caught
  • Copyleaks1.00passed
  • Originality.ai1.00passed
Median
1.00
Meaning
89.1
Readability
62.0
Words
1.24× 182 → 226
Show output (226 words)

Sleeker. Stronger. The Ultimate Stainless-Steel Insulated Water Bottle is here. With a blend of attractive style and high level performance, the Ultimate Stainless-Steel Insulated Water Bottle seamlessly integrates into the life of the modern adventurer, daily commuter and fitness aficionado. Made of tough yet elegant premium food grade 18/8 stainless steel, the Ultimate Stainless-Steel Insulated Water Bottle is BPA free, rust resistant, and is tough enough to take on daily life. Using advanced double wall vacuum seal technology, drinks stay cold for up to 24 hours and hot for 12. Say hello to water bottle technology of the future! This vacuum seal technology also eliminates condensation so you can have a firm grip on your cold drinks. With a leak proof and spill proof airtight lid that screws on (just like your favorite reusable water bottles), the Ultimate Stainless-Steel Insulated Water Bottle stays fresh on the go. With a wide opening, the Ultimate Stainless-Steel Insulated Water Bottle is easy to keep clean as ice cubes can easily be added and removed as needed. An integrated carry loop allows for hands free transport of your water. Made with the user in mind, the Ultimate Stainless-Steel Insulated Water Bottle is scratch resistant, fade resistant, and eco friendly. You can reduce your carbon footprint, stop your single use plastic habit, and stay refined and rejuvenated wherever life may lead.

Stealth Writer

Rank #3 this cycle · run took 0:14

4/5 detectors passed
  • GPTZero0.00caught
  • Winston AI1.00passed
  • ZeroGPT0.63passed
  • Copyleaks1.00passed
  • Originality.ai1.00passed
Median
1.00
Meaning
94.1
Readability
45.0
Words
1.08× 182 → 196
Show output (196 words)

Introducing the ultimate HYDRATION any way you go: the Stainless-Steel Insulated Water Bottle. Designed for every type of adventurer, daily commuter and fitness buff, this bottle features cutting-edge performance with sleek design. It is made of the 100% BPA-free, rust resistant, food quality, premium 18/8 stainless steel and does not impart flavors. It is fully vacuum insulated with double walled construction, so that your beverages are kept ice-cold for up to 24-hours or piping hot for 12-hours. Say goodbye to sweaty, condensation annoys—a non-sweat exterior for a firm, dry hold even when your drink is ice cold. It has a leak-proof, airtight, lid in order to keep freshness inside, and to avoid any spills in your bag. The large opening makes it easy to add the ice cubes and clean; with a built-in carry loop, transportation is a breeze as well. This bottle is eco friendly as well as stylish, available in a number of beautiful powder coated finishes as well as resistant to scratching and fading. Choose the eco-friendly option, ditch the single-use plastics and savor fresh and pure hydration when you're living life to the fullest. Your ideal cocktail is just a twist away.

HIX Bypass

Rank #4 this cycle · run took 0:17

4/5 detectors passed
  • GPTZero0.00caught
  • Winston AI1.00passed
  • ZeroGPT0.86passed
  • Copyleaks1.00passed
  • Originality.ai0.59passed
Median
0.86
Meaning
94.3
Readability
38.0
Words
1.07× 182 → 194
Show output (194 words)

Say Hello to your new hydration partner: The ultimate Stainless-Steel Insulated Water Bottle. Designed for the contemporary explorer, everyday commuter and fitness fanatic, this bottle fuses great looks with heavyweight performance. Made from food-grade 18/8 stainless steel, it is BPA-free and rust resistant and built to survive your life — tumbling through the car or landing on the floor at a friend’s place. Its state of the art double-wall vacuum insulation keeps your drink ice cold for up to 24 hours, or piping hot for 12. Goodbye condensation—sweating does not happen & you have a firm dry grip regardless of beverage temperature. The leak-proof, airtight lid keeps everything inside fresh and there are no leaks into your bag. A wide-mouth opening make it easy to drop in ice cubes and clean, while an entire carry loop lets you easily take your drink with you. This eco-friendly bottle works well for scuffing and fading. It also comes in a variety of bright powder-coated finishes that are made to dominate any look. Choose sustainable, ditch single-use plastics and get pure hydration wherever life takes you. You are less than an twists away from your perfect sip.

Humbot

Rank #5 this cycle · run took 0:29

4/5 detectors passed
  • GPTZero0.99passed
  • Winston AI0.77passed
  • ZeroGPT0.39caught
  • Copyleaks1.00passed
  • Originality.ai0.62passed
Median
0.77
Meaning
88.4
Readability
42.0
Words
1.12× 182 → 204
Show output (204 words)

Introducing The Ultimate Stainless-Steel Insulated Water Bottle That You Need To Get Your Hands On If You Want To Stay Hydrated — 당신의 새로운 수소기 필수품 Designed for the contemporary adventurer, daily commuter and health nut alike—this bottle has both looks and brawn. Made of high-quality, food-grade 18/8 stainless steel, it is 100% BPA-free, rust-resistant and dishwasher-safe so it can take on all the little bumps that life throws your way without affecting taste. The double-wall vacuum insulation on this premium model keeps drinks ice-cold for as long as 24 hours or piping hot for 12. Say bye to condensation that annoys the living hell out of you — the outside is free of sweat! The lid is leak-proof, airtight to keep your drinks fresh and no spills in your bag. Thanks to the wide-mouth opening, simply toss in your ice cubes and go, the extra-wide mouth makes cleaning a snap, and also includes a carry loop for easy transport. The ultra-durable, eco-friendly bottle comes in a wide variety of eye-catching powder-coated finishes that resist scratching and fading. Choose sustainability, ditch single-use plastics and enjoy clean drinking water anywhere you are. Just a twist is all that stands between you and your perfect sip.

AI Humanize io

Rank #6 this cycle · run took 0:23

4/5 detectors passed
  • GPTZero0.00caught
  • Winston AI1.00passed
  • ZeroGPT0.84passed
  • Copyleaks1.00passed
  • Originality.ai1.00passed
Median
1.00
Meaning
88.9
Readability
42.0
Words
0.71× 182 → 129
Show output (129 words)

Now Introducing the Stainless Steel Insulated Water Bottle which is your new hydration essential. It is designed for adventure lovers, daily commuters, and fitness enthusiasts and merges aesthetics and performance into one product. It is made of made from premium grade 18/8 stainless steel and is BPA-free, rust resistant, and durable for daily usage. It makes use of double-vacuum insulation to keep drinks cold up to 24 hours and hot for at least 12 hours. It does not allow condensation making it free of moisture. The leak proof, airtight lid helps to preserve freshness of content and prevents any spillage. The wide mouth gives freedom to pour ice cubes or clean the bottle anytime. The eco-friendly and stylish bottle comes in many colors and saves you from using plastics.

Phrasly

Rank #7 this cycle · run took 0:41

3/5 detectors passed
  • GPTZero1.00passed
  • Winston AI0.01caught
  • ZeroGPT0.31caught
  • Copyleaks1.00passed
  • Originality.ai1.00passed
Median
1.00
Meaning
88.6
Readability
65.0
Words
1.15× 182 → 210
Show output (210 words)

Say hello to your new favorite water bottle. The Premium Stainless-Steel Insulated Water Bottle is perfect for the outdoorsy type, busy professionals, students, gym goers, or anyone who wants a high-quality insulated water bottle that not only looks good but performs at its best. Made from high-quality, food-grade 18/8 stainless steel, it’s 100% free of BPA, will never rust or leak, and won’t absorb flavors. Plus, its double- wall vacuum insulation can keep your beverages cold for up to 24 hours or hot for 12 hours. The insulation also creates a sweat-free exterior so you can easily hold your bottle while your drink is cold. It has a leak-proof airtight lid to keep your water fresh and from dripping in your bag or pocket. Plus, cleaning this bottle is easy thanks to its wide mouth opening. Just toss in some ice cubes with ease and give it a quick rinse when you’re finished. It even has a carry loop for convenient transport while on the go. This stainless steel bottle comes in an assortment of colors that are powered-coated to avoid scratching and fading. Stainless steel is also better for the environment than single-use plastics, so make the switch today and start enjoying clean, great tasting water wherever you go.

Super Humanizer

Rank #10 this cycle · run took 0:16

3/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.03caught
  • ZeroGPT0.55passed
  • Copyleaks1.00passed
  • Originality.ai0.99passed
Median
0.55
Meaning
90.7
Readability
52.0
Words
1.09× 182 → 198
Show output (198 words)

Introducing your go-to hydration accessory – the All-Time Stainless-Steel Insulated Water Bottle! Tailor-made for the globetrotter, the daily commute, or the dedicated fitness enthusiast; it brings together form and functionality. Made of Food-Grade 18/8 Stainless Steel to keep your drinks free from BPA and rust while guaranteeing an odor-free flavor that can face the rigors of everyday life! Double-wall vacuum insulation guarantees ice-cold drinks up to 24 hours while hot beverages remain steaming up to 12 hours. This is truly the leak-proof, sweat-free water bottle you have been waiting for! <b>Features</b> - Keeps drinks icy cold for up to 24 hours and piping hot for up to 12 hours. - Double-wall vacuum insulation - Made from premium food-grade 18/8 Stainless Steel. - Odor free, BPA-free and rust-resistant design - Sweat proof, anti- slip and provides grip without creating water droplets - Leak-proof and airtight lid - Wide mouth opening for easy cleaning and add ice cubes. - Integrated carry loop - Available in various vibrant powder-coated scratch resistance and fading resistance colors. - The smart and eco-friendly choice to beat the heat – no more single use plastics and get your pure, fresh sip any time you choose.

Grammarly

Rank #11 this cycle · run took 0:18

0/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.02caught
  • Copyleaks0.00caught
  • Originality.ai0.00caught
Median
0.00
Meaning
97.6
Readability
78.0
Words
0.94× 182 → 171
Show output (171 words)

Meet your new hydration essential, the ultimate Stainless-Steel Insulated Water Bottle. This bottle is made for the modern adventurer, daily commuter, and fitness enthusiast. It combines a sleek look with impressive performance. Made from high-quality, food-grade 18/8 stainless steel, it is 100% BPA-free, rust-resistant, and able to handle everyday bumps without altering flavors. Thanks to its double-wall vacuum insulation, your drinks stay ice-cold for up to 24 hours or hot for 12. The sweat-free exterior keeps your grip firm and dry, no matter how cold your beverage is. This bottle emphasizes convenience. It has a leak-proof, airtight lid that keeps drinks fresh and prevents spills in your bag. The wide-mouth opening makes it easy to add ice cubes and clean, while the integrated carry loop simplifies transport. Available in a range of vibrant, powder-coated finishes that resist scratches and fading, this eco-friendly bottle is both stylish and durable. Make the sustainable choice, reduce single-use plastics, and enjoy refreshing hydration wherever life takes you. Your perfect sip is just a twist away.

StealthGPT

Rank #12 this cycle · run took 0:39

0/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.01caught
  • ZeroGPT0.00caught
  • Copyleaks0.00caught
  • Originality.ai0.00caught
Median
0.00
Meaning
86.5
Readability
62.0
Words
1.36× 182 → 247
Show output (247 words)

Say hello to the all-in-one water bottle that will elevate your drinking game! The Stainless-Steel Insulated Water Bottle is designed to keep you cool and refreshed throughout your day. Made from high-quality stainless steel, this insulated water bottle keeps your beverages at the ideal temperature for hours on end. Whether you're commuting to work or hitting the gym, this double-walled water bottle is the perfect companion. With a capacity of 500 ml, it fits perfectly in your handbag or gym bag, making it the ideal travel companion. This 18/8 stainless steel insulated bottle is food-grade quality and is completely free from BPA. Its powder-coated finish not only makes it look chic but also protects it from scratches and fading. This stainless steel insulated bottle is a great gift idea for anyone who loves to stay hydrated. Whether you're a health-conscious individual or a busy professional, the double-walled stainless steel insulated water bottle is the perfect choice. Its anti-condensation technology means no more water droplets on your hands, so you can take your drink with confidence. The leak-proof seal of the lid ensures that you don't have to worry about any spills in your bag. It's easy to clean and has a wide mouth opening, which makes it easy to add ice cubes and clean. Don't settle for less than the best. Invest in a high-quality, double-walled stainless steel insulated water bottle today. It's time to ditch the plastic bottles and make a positive impact on the environment.

Session recording