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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 AI Humanize io and Penlify were tested together.

Head to head · September 2026 cycle

AI Humanize io vs Penlify

AI Humanize io finished 36.4 points ahead of Penlify in the September 2026 cycle, 72.94 to 36.57, ranking #4 against #14 in a field of 14. AI Humanize io scored higher on 5 of 5 detectors and 7 of 7 writing categories. Penlify came out ahead on consistency across categories (100.0 vs 69.2) and readability (71.8 vs 58.4).

72.94 /100
overall score
#4 /14
rank ▲ 2
+36.37
← AI Humanize io leads
Detectors
5 – 0
Categories
7 – 0
Components
3 – 2
36.57 /100
overall score
#14 /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 AI Humanize io by 81.5
81.5 0.0
Meaning preservation AI Humanize io by 10.5
73.2 62.7
Readability Penlify by 13.4
58.4 71.8
Consistency Penlify by 30.8
69.2 100.0
Penalties fewer is better AI Humanize io by 4.0
−1.0 −5.0

Detector by detector

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

GPTZero AI Humanize io by 55.8
55.8 0.0
Originality.ai AI Humanize io by 93.3
93.3 0.0
Copyleaks AI Humanize io by 60.6
60.6 0.0
Winston AI AI Humanize io by 78.6
79.0 0.4
ZeroGPT AI Humanize io by 32.0
75.0 43.0

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: AI Humanize io 80.3 · Penlify 27.0 Application Essay: AI Humanize io 68.0 · Penlify 35.9 Blog Post: AI Humanize io 80.9 · Penlify 37.3 Business Email: AI Humanize io 46.2 · Penlify 39.9 Marketing Copy: AI Humanize io 82.4 · Penlify 38.8 Discussion Board: AI Humanize io 62.5 · Penlify 32.1 News Article: AI Humanize io 71.8 · Penlify 36.6
AI Humanize io Penlify Outer ring = 100
Academic Essay 6 prompts AI Humanize io by 53.3
80.3 27.0
Application Essay 6 prompts AI Humanize io by 32.2
68.0 35.9
Blog Post 6 prompts AI Humanize io by 43.6
80.9 37.3
Business Email 3 prompts AI Humanize io by 6.3
46.2 39.9
Marketing Copy 6 prompts AI Humanize io by 43.5
82.4 38.8
Discussion Board 3 prompts AI Humanize io by 30.4
62.5 32.1
News Article 3 prompts AI Humanize io by 35.2
71.8 36.6

Where each one wins

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

AI Humanize io

15 wins
  • Bypass rate Score 81.5 vs 0.0
  • Penalties Score −1.0 vs −5.0
  • Meaning preservation Score 73.2 vs 62.7
  • Originality.ai Detector 93.3 vs 0.0
  • Winston AI Detector 79.0 vs 0.4
  • Copyleaks Detector 60.6 vs 0.0
  • GPTZero Detector 55.8 vs 0.0
  • ZeroGPT Detector 75.0 vs 43.0
  • Academic Essay Category 80.3 vs 27.0
  • Blog Post Category 80.9 vs 37.3
  • and 5 more

Penlify

2 wins
  • Consistency Score 100.0 vs 69.2
  • Readability Score 71.8 vs 58.4

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.

Cover Letter · Application Essay · written by Claude Sonnet 5 · 405 words

# Cover Letter for Policy Analyst Position

Dear Hiring Manager,

I am writing to express my interest in the Policy Analyst position with the City of [City Name]. With a strong background in public policy research, data analysis, and community engagement, I am eager to contribute to the city's mission of developing effective, equitable policies that improve residents' quality of life.

In my current role as a Policy Research Associate at [Current Organization], I have honed my ability to translate complex data into actionable recommendations for decision-makers. I recently led a comprehensive analysis of affordable housing initiatives, which involved reviewing zoning regulations, conducting stakeholder interviews, and benchmarking best practices from comparable municipalities. This project resulted in three policy recommendations that were adopted by our city council, contributing to a 15% increase in affordable housing units within the following year.

I understand that effective policy analysis requires more than technical expertise—it demands a deep commitment to understanding community needs and navigating the political landscape thoughtfully. Throughout my career, I have prioritized building relationships with diverse stakeholders, including community organizations, business leaders, and government officials, to ensure that policy recommendations reflect the needs of all residents. My experience facilitating public forums and translating technical findings into accessible language for community members has strengthened my ability to bridge the gap between data-driven analysis and public engagement.

I am particularly drawn to this position because of [City Name]'s recent initiatives in [specific area, e.g., sustainable transportation, economic development, or public health]. Your work on [reference a specific project or policy] resonates with my professional values and experience in [related skill or project]. I am excited about the opportunity to bring my analytical skills and collaborative approach to a team dedicated to fostering positive change within the community.

My proficiency in statistical software (including R and Stata), combined with my strong writing and presentation skills, allows me to conduct rigorous analysis while effectively communicating findings to varied audiences—from technical staff to elected officials to the general public. I am comfortable managing multiple projects simultaneously and thrive in fast-paced environments where priorities may shift based on emerging community needs.

I would welcome the opportunity to discuss how my background in policy analysis and passion for public service align with the goals of your department. Thank you for considering my application. I look forward to the possibility of contributing to [City Name]'s continued efforts to serve its residents effectively.

Sincerely, [Your Name]

Show the full input

368 words (input 405)

# Cover Letter for Policy Analyst Position

Dear Hiring Manager,

I am writing to express my interest for the Policy Analyst position at the City of [City Name]. With extensive experience in public policy research, data analysis, and community engagement, I am ready to work as an active participant to make significant contributions towards developing effective policies for the city.

My current position as a Policy Research Associate at [Current Organization], I have honed my skills on the ground and translated complex data into actionable recommendations. With my experience on analyzing affordable housing programs, this work included analyzing zoning regulations, stakeholder interviews, and benchmarking similar cities in order to bring about the best practices. With this project, effective recommendations were made, which were adopted by the city council, thus creating a positive impact of 15% on affordable housing units in the following year.

I know effective policy analysis includes much more than merely possessing technical ability; it also requires a commitment to thoroughly understand communities through political navigation. Throughout my career, I have successfully built strong relationships with groups of different citizens (community organizations, business leadership, and government officials) in order to produce policy recommendations reflecting the needs of all people. My experience providing public forums and explaining technical findings in plain language improves my ability to effectively bridge the gap within policy analysis and community engagement.

I am particularly interested in this position because of the recent city endeavors in [specific area, e.g. sustainable transportation, economic development, or public health]. Your city endeavors in [reference a specific project or policy] directly align with my values and past work experience in [related skill or project].

Statistical software is my specialty (R, Stata), combined with writing and presentation skills enabling me to provide necessary detailed and precise analyses that I present to various audiences from technical staff, elected officials, and the public. I successfully handle numerous projects occurring at once and I thrive in busy environments that may change according to community needs.

I would enjoy discussing my policy analysis experience and public service desire with you at your convenience. Thank you for considering my application. I look forward to helping [City Name] serve its citizens.

Sincerely, [Your Name]

Show the full output
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.69passed
  • Copyleaks0.00caught
  • Originality.ai1.00passed

Passed 2 of 5 detectors.

Every AI Humanize io run in September 2026 →

314 words (input 405)

Dear Hiring Manager,

I'm reaching out because the Policy Analyst opening with the City of [City Name] grabbed my attention. My work in public‑policy research, data crunching and community outreach feels like a good fit for what you're trying to achieve, more equitable, livable neighborhoods.

These days I'm a Policy Research Associate at [Current Organization]. Last year I dove into the affordable‑housing arena, pulling apart zoning rules, chatting with residents and pulling best‑practice examples from peer cities. The result? Three concrete recommendations that the council adopted, and a 15 % bump in affordable units the following year.

Good policy isn't just numbers on a spreadsheet; it's listening to the people those numbers affect. I've spent years building bridges with neighborhood groups, local business owners and city officials, making sure every voice gets a seat at the table. Running public forums and translating technical findings into plain‑language handouts has become second nature, sometimes I even end up field‑testing a draft on the street outside a council meeting.

What really pulls me toward this role is the city's push on [specific area, e.g., sustainable transportation]. I saw the recent [project/policy] rollout and thought, "That's exactly the kind of work I thrive on." My own stint on a bike‑lane feasibility study gave me hands‑on experience that lines up nicely with your goals.

I'm comfortable with R, Stata and the usual statistical toolbox, and I can turn a dense data set into a story that a mayor, a planner or a neighborhood resident can all follow. Juggling several projects at once? No problem, I actually enjoy the fast‑paced, ever‑shifting environment that city work brings.

I'd love to chat about how my background and passion for public service could help the department hit its targets. Thanks for taking the time to read this; I look forward to the chance to contribute to [City Name]'s continued progress.

Sincerely, [Your Name]

Show the full output
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.06caught
  • Copyleaks0.00caught
  • Originality.ai0.00caught

Passed 0 of 5 detectors.

Every Penlify 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 AI Humanize io better than Penlify?

AI Humanize io finished 36.4 points ahead of Penlify in the September 2026 cycle, 72.94 to 36.57, ranking #4 against #14 in a field of 14. AI Humanize io scored higher on 5 of 5 detectors and 7 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, AI Humanize io or Penlify?

AI Humanize io posted the higher bypass rate, 81.5 vs 0.0, and scored higher on 5 of 5 detectors. AI Humanize io led on GPTZero, Originality.ai, Copyleaks, Winston AI and ZeroGPT.

Do AI Humanize io and Penlify keep the original meaning?

AI Humanize io preserved meaning better, 73.2 vs 62.7 on our 0–100 similarity scale. On readability, Penlify rated higher, 71.8 vs 58.4. Penalties this cycle: AI Humanize io −1.0, Penlify −5.0.