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October 2026 results: WriteHuman holds #1, StealthGPT jumps to #2. Read the analysis →
HumanizerBench

Stealth Writer

Stealth Writer ranked #8 of 14 in the October 2026 cycle with an overall score of 65.98/100, after losing 3 points to penalties for meaning drift and length inflation. Originality.ai passed its output most often (99.9%), and Pangram passed none of it. It did best on blog posts and worst on discussion board posts.

Stealth Writer is a standalone AI humanizer from AiVantage LLC with a built-in AI detector that scores text sentence by sentence. It offers light, medium and aggressive rewrite levels, and any sentence can be swapped for an alternative rewrite. The free plan allows 10 humanizations a day of up to 1,000 words each.

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Overall score
65.98/100
Detector bypass
71.3%
Overall rank
#8of 14
Prompts tested
30
See every test → How we score Fairness policy

Detector Bypass Rates

Each detector's average human-likelihood score on this tool's outputs, where 100 means every output was scored as human.

Performance by Category

Category score across writing contexts: bypass credit only for real rewrites, blended with each category's meaning and readability. How it's computed

Academic Essay: 66.8Application Essay: 66.1Blog Post: 68.3Marketing Copy: 57.4Discussion Board: 54.2News Article: 55.4AcademicEssay66.8ApplicationEssay66.1BlogPost68.3MarketingCopy57.4DiscussionBoard54.2NewsArticle55.4

Strengths

  • Originality.ai classified 99.9% of its runs as human-written

Weaknesses

  • Readability of 41.8, the lowest this cycle (field median 59.5)
  • Lost 3 points to penalties for meaning drift and length inflation
  • Pangram classified none of its runs as human-written

From the October 2026 cycle, compared with the other 13 tools ranked in that cycle.

Evidence: every run

Every prompt Stealth Writer was run on in October 2026, and how each of the 6 detectors scored the output. Green: the detector called it human-written. Red: it was caught.

0 of 30 outputs passed all 6 detectors; 30 were caught by at least one.

Prompt GPT Pan Win Zero Copy Orig Mean Recording
Landing Copy · gemini-3-8-flash caught caught passed passed passed passed 0.65
Product Desc · gemini-3-8-flash caught caught passed passed passed passed 0.64
Landing Copy · gpt-6-sol passed caught passed passed passed passed 0.83
Discussion Post · gpt-6-sol caught caught passed passed passed passed 0.67
Product Desc · gpt-6-sol caught caught passed passed passed passed 0.63
Lit Review · claude-sonnet-5-5 caught caught passed passed passed passed 0.61
Lit Review · gpt-6-sol caught caught passed passed passed passed 0.62
Cover Letter · gpt-6-sol caught caught passed passed passed passed 0.65
Howto Blog · gemini-3-8-flash passed caught passed passed passed passed 0.78
Lit Review · gemini-3-8-flash passed caught passed passed passed passed 0.80
Landing Copy · claude-sonnet-5-5 passed caught passed passed passed passed 0.82
Personal Statement · gemini-3-8-flash caught caught passed passed passed passed 0.67
Argumentative Essay · gpt-6-sol caught caught passed passed passed passed 0.66
Listicle Blog · gemini-3-8-flash passed caught passed passed passed passed 0.80
Personal Statement · claude-sonnet-5-5 caught caught passed passed passed passed 0.67
Howto Blog · gpt-6-sol passed caught passed passed passed passed 0.78
Product Desc · claude-sonnet-5-5 passed caught passed passed passed passed 0.81
Listicle Blog · claude-sonnet-5-5 passed caught passed passed passed passed 0.81
Argumentative Essay · claude-sonnet-5-5 passed caught passed passed passed passed 0.81
News Article · gpt-6-sol caught caught passed passed passed passed 0.72
Howto Blog · claude-sonnet-5-5 caught caught passed passed passed passed 0.61
News Article · claude-sonnet-5-5 passed caught passed passed passed passed 0.82
Discussion Post · gemini-3-8-flash caught caught passed passed passed passed 0.65
Discussion Post · claude-sonnet-5-5 caught caught passed passed passed passed 0.67
Cover Letter · gemini-3-8-flash caught caught passed passed passed passed 0.66
Listicle Blog · gpt-6-sol passed caught passed passed passed passed 0.81
Cover Letter · claude-sonnet-5-5 caught caught passed passed passed passed 0.65
Personal Statement · gpt-6-sol caught caught passed passed passed passed 0.66
News Article · gemini-3-8-flash passed caught passed passed passed passed 0.82
Argumentative Essay · gemini-3-8-flash passed caught passed passed caught passed 0.63
Detector rate 40.9 0.0 hardest 99.4 90.7 96.7 99.9
Runs passed 13/30 0/30 30/30 30/30 29/30 30/30

A dot is green when the detector's human-likelihood score for that run was 0.50 or higher. The detector rate is the mean of that detector's scores across the runs, the same number the detector pages rank by; it is not the count of green dots, which the Runs passed row shows. Hover a dot for the score.

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 scores from the 6 detectors, a continuous number, so a tool's pass count and its bypass rate will not be the same figure.

Read all 30 Stealth Writer outputs → Compare every tool on a prompt →

Session recording

History

Overall score compared with other ranked tools.

Latest score65.98/100
Score / 100 Shown range: 25–100
25 50 75 100 June 2026. Other 12 tools: median 71.28, middle 50% 66.62–80.14. July 2026. Other 12 tools: median 62.18, middle 50% 58.28–67.44. August 2026. Other 11 tools: median 63.30, middle 50% 58.34–67.44. September 2026. Other 13 tools: median 67.58, middle 50% 60.97–72.80. October 2026. Other 13 tools: median 67.58, middle 50% 62.75–69.02. June 2026: 84.47/100 · #1. Other 12 tools: median 71.28, middle 50% 66.62–80.14. June 2026 July 2026: 68.07/100 · #4. Other 12 tools: median 62.18, middle 50% 58.28–67.44. July 2026 August 2026: 69.83/100 · #3. Other 11 tools: median 63.30, middle 50% 58.34–67.44. August 2026 September 2026: 75.39/100 · #2. Other 13 tools: median 67.58, middle 50% 60.97–72.80. September 2026 October 2026: 65.98/100 · #8. Other 13 tools: median 67.58, middle 50% 62.75–69.02. October 2026 25 50 75 100 June 2026. Other 12 tools: median 71.28, middle 50% 66.62–80.14. July 2026. Other 12 tools: median 62.18, middle 50% 58.28–67.44. August 2026. Other 11 tools: median 63.30, middle 50% 58.34–67.44. September 2026. Other 13 tools: median 67.58, middle 50% 60.97–72.80. October 2026. Other 13 tools: median 67.58, middle 50% 62.75–69.02. June 2026: 84.47/100 · #1. Other 12 tools: median 71.28, middle 50% 66.62–80.14. June 2026 July 2026: 68.07/100 · #4. Other 12 tools: median 62.18, middle 50% 58.28–67.44. August 2026: 69.83/100 · #3. Other 11 tools: median 63.30, middle 50% 58.34–67.44. August 2026 September 2026: 75.39/100 · #2. Other 13 tools: median 67.58, middle 50% 60.97–72.80. October 2026: 65.98/100 · #8. Other 13 tools: median 67.58, middle 50% 62.75–69.02. October 2026
Stealth Writer Others’ median Others’ middle 50%

1.6 points below the median of 13 other tools in October 2026.

The shaded band is the 25th–75th percentile of other tools in each cycle. Scores are out of 100; higher is better.

Monthly pricing

Standard USD rates, billed month to month. Annual discounts and promotions excluded.

  • Starter

    $20.00/mo

    50 humanizations per day.

    • Up to 5,000 input words per request.

  • Plus

    $50.00/mo

    150 humanizations per day.

    • Up to 5,000 input words per request.

  • Pro

    $100.00/mo

    350 humanizations per day.

    • Up to 5,000 input words per request.

  • Business

    $200.00/mo

    800 humanizations per day.

    • Up to 5,000 input words per request.

  • Scale

    $400.00/mo

    2,000 humanizations per day.

    • Up to 5,000 input words per request.

Free access and trials

The free plan allows 10 humanizations a day, up to 1,000 input words each.

  • Allowances renew daily, not as a monthly word pool. Enterprise pricing is available by request.

Sample output

One AI-written passage from the October 2026 cycle and what Stealth Writer returned for it. This prompt was picked by a fixed rule, not by how the tool scored.

AI-written input

Every tool on this prompt →

Product Desc · Marketing Copy · written by gpt-6-sol · 200 words

Bring precision to every line with a ruler built for careful measuring and marking. Precision-milled from stainless steel, it offers a straight, dependable edge for layout work, drafting, and workshop tasks. Its metal construction gives it a reassuring feel in hand and makes it a practical choice for a tool you will reach for again and again.

Use the ruler to mark a cut line, check a dimension, guide a pencil, or keep a drawing aligned. The slim profile sits close to the surface, helping you place it where you need it and see the work beneath your hand. On a desk, at a workbench, or in a project kit, it is a simple tool with a clear purpose: helping you work with care.

Made for makers, designers, students, and anyone who values a clean line, this ruler fits naturally into everyday routines. It pairs well with a sharp pencil, a marking knife, or your favorite notebook. Whether you are planning a detailed project or making a quick measurement, its precise edge helps you move from an idea to the next step with confidence. Keep it nearby for the small checks and straight lines that make a difference over time.

Show the full input

Stealth Writer output

193 words (input 200)

Measure precisely with precision designed ruler to mark out perfectly every line. Machined from stainless steel for an accurate, reliable cutting surface for layout work, drafting, and in the workshop. It feels great in the hand thanks to its metal construction, and would offer a very usable feel on a tool that you'll want to grab to use time after time.

Mark a cutting line, verify a dimension, guide a pencil and/or maintain alignment of a drawing using the ruler. The thin outline rests just under the surface, allowing you to position at your preferred location while allowing for visibility of work under your fingers. It is a straightforward solution, clean and easy to use, sitting on a desk, a workbench or a project kit to help you work with care.

This ruler is designed with makers, designers, students and those who appreciate a crisp line in mind. Complements any sleek pencil, a marking knife or favorite notebook. Its accurate edge can give you peace of mind as you take your project from ideation to execution. Have them at your fingertips for those small checks and straight lines that add up over time.

Show the full output
  • GPTZero0.00caught
  • Pangram0.00caught
  • Winston AI0.95passed
  • ZeroGPT0.81passed
  • Copyleaks1.00passed
  • Originality.ai1.00passed

Passed 4 of 6 detectors.

Every Stealth Writer run in October 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.

Penalties applied this cycle

How penalties work →

The overall score shown above already reflects these deductions.

  • Meaning drift ×2
    −2.0

    The output's meaning drifted significantly from the original input.

  • Length inflation
    −1.0

    The output ran much longer than the input, a common trick that pads text to dilute the AI signal.

Total deducted from overall score −3.0

Compare with

Stealth Writer vs
HIX Bypass
65.14 · rank #9
Stealth Writer vs
Super Humanizer
67.58 · rank #7
Stealth Writer vs
AI Humanize io
68.24 · rank #6
Compare Stealth Writer with any tool → Every matchup →

Featured in

Best Free Humanizer → Best for GPTZero →

Questions about Stealth Writer

Answers are generated from the benchmark data and update every month. Last updated with the October 2026 cycle.

Is Stealth Writer good?

Stealth Writer ranked #8 of 14 in the October 2026 HumanizerBench cycle with an overall score of 65.98/100, below the field median of 66.78. On the parts of the score, it placed #8 of 14 on detector bypass, #7 of 14 on meaning preservation and #14 of 14 on readability. The score includes a 3-point deduction for meaning drift and length inflation.

Does Stealth Writer bypass AI detectors?

In the October 2026 cycle, Stealth Writer had a detector bypass rate of 71.3% (#8 of 14 tools). 0 of its 30 outputs passed all 6 detectors, and 30 were caught by at least one. Its average human-likelihood score from each detector, where 100 means every output was scored as human: Originality.ai 99.9, Winston AI 99.4, Copyleaks 96.7, ZeroGPT 90.7, GPTZero 40.9 and Pangram 0.0.

Can Stealth Writer bypass GPTZero?

In the October 2026 cycle, Stealth Writer's average human-likelihood score from GPTZero was 40.9 out of 100 (#11 of 14 tools against GPTZero). The highest average GPTZero score that cycle was 99.5, by WriteHuman. See every tool's GPTZero results.

Is Stealth Writer free?

The free plan allows 10 humanizations a day, up to 1,000 input words each. Paid plans start at $20.00 a month, billed monthly.

Is Stealth Writer legit?

Stealth Writer is a working AI humanizer at stealthwriter.ai. HumanizerBench has tested it in 5 monthly cycles, most recently October 2026, when it completed 30 of 30 test runs. Every input and output from its runs is published with each detector's verdict.

Does Stealth Writer keep the original meaning?

Stealth Writer scored 71.6 out of 100 for meaning preservation in the October 2026 cycle (#7 of 14; field median 71.0). The score measures how close each rewrite stays to the meaning of the original text. Its readability score was 41.8 (#14 of 14). It lost 3 points to penalties for meaning drift and length inflation.

Which kinds of writing does Stealth Writer handle best?

In the October 2026 cycle, Stealth Writer did best on blog posts (68.3/100) and worst on discussion board posts (54.2/100). On academic essays it ranked #8 of 14.

How has Stealth Writer ranked over time?

Stealth Writer has been ranked in 5 HumanizerBench cycles: #1 in June 2026, #4 in July 2026, #3 in August 2026, #2 in September 2026 and #8 in October 2026. Its overall score went from 84.47 in June 2026 to 65.98 in October 2026.

What are the best alternatives to Stealth Writer?

In the October 2026 cycle, 7 tools ranked above Stealth Writer. The top three were WriteHuman (#1, 74.89/100), StealthGPT (#2, 74.50/100) and Undetectable.ai (#3, 71.18/100). Compare Stealth Writer with any of them side by side.

Badges

Stealth Writer is ranked in the October 2026 cycle, so it can embed any of these cards for free, and the live file re-renders every cycle, including when a rank falls. Usage rules →

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Overall

Detectors

Stealth Writer: ranked #8 AI humanizer on HumanizerBench, October 2026

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