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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 Grammarly and Penlify were tested together.

Head to head · September 2026 cycle

Grammarly vs Penlify

Grammarly finished 23.8 points ahead of Penlify in the September 2026 cycle, 60.35 to 36.57, ranking #12 against #14 in a field of 14. Grammarly scored higher on 5 of 5 detectors and 7 of 7 writing categories. Penlify came out ahead on consistency across categories (100.0 vs 78.7) and readability (71.8 vs 66.1).

60.35 /100
overall score
#12 /14
rank ▼ 1
+23.78
← Grammarly 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 Grammarly by 41.1
41.1 0.0
Meaning preservation Grammarly by 23.6
86.4 62.7
Readability Penlify by 5.8
66.1 71.8
Consistency Penlify by 21.3
78.7 100.0
Penalties fewer is better Grammarly by 2.0
−3.0 −5.0

Detector by detector

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

GPTZero Grammarly by 15.9
15.9 0.0
Originality.ai Grammarly by 43.4
43.4 0.0
Copyleaks Grammarly by 60.3
60.3 0.0
Winston AI Grammarly by 38.5
38.9 0.4
ZeroGPT Grammarly by 15.0
58.0 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: Grammarly 69.5 · Penlify 27.0 Application Essay: Grammarly 55.0 · Penlify 35.9 Blog Post: Grammarly 58.9 · Penlify 37.3 Business Email: Grammarly 44.7 · Penlify 39.9 Marketing Copy: Grammarly 56.5 · Penlify 38.8 Discussion Board: Grammarly 44.5 · Penlify 32.1 News Article: Grammarly 62.8 · Penlify 36.6
Grammarly Penlify Outer ring = 100
Academic Essay 6 prompts Grammarly by 42.5
69.5 27.0
Application Essay 6 prompts Grammarly by 19.1
55.0 35.9
Blog Post 6 prompts Grammarly by 21.7
58.9 37.3
Business Email 3 prompts Grammarly by 4.8
44.7 39.9
Marketing Copy 6 prompts Grammarly by 17.7
56.5 38.8
Discussion Board 3 prompts Grammarly by 12.4
44.5 32.1
News Article 3 prompts Grammarly by 26.2
62.8 36.6

Where each one wins

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

Grammarly

15 wins
  • Bypass rate Score 41.1 vs 0.0
  • Meaning preservation Score 86.4 vs 62.7
  • Penalties Score −3.0 vs −5.0
  • Copyleaks Detector 60.3 vs 0.0
  • Originality.ai Detector 43.4 vs 0.0
  • Winston AI Detector 38.9 vs 0.4
  • GPTZero Detector 15.9 vs 0.0
  • ZeroGPT Detector 58.0 vs 43.0
  • Academic Essay Category 69.5 vs 27.0
  • News Article Category 62.8 vs 36.6
  • and 5 more

Penlify

2 wins
  • Consistency Score 100.0 vs 78.7
  • Readability Score 71.8 vs 66.1

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.

Discussion Post · Discussion Board · written by Claude Sonnet 5 · 246 words

# The Meeting Paradox

Meetings have become the workplace's most universal complaint, and this frustration reveals deeper tensions in how we structure collaborative work. Several forces have converged to create this cultural moment.

First, digital calendars made scheduling meetings frictionless, removing the natural constraint that once limited their frequency. When booking a meeting requires only a few clicks, the psychological cost of calling one disappears, leading to exponential growth in meeting volume without corresponding growth in their value.

Second, remote and hybrid work has paradoxically increased meeting dependency. Without hallway conversations or casual desk-side check-ins, organizations have compensated by scheduling formal meetings for interactions that once happened organically, cramming calendars with synchronous time that fragments focus.

Third, there's a widespread confusion between activity and productivity. Meetings create visible evidence of "work happening"—they photograph well, generate action items, and satisfy managers' need to demonstrate oversight. This makes them attractive even when asynchronous communication would accomplish the same goals more efficiently.

Fourth, poor meeting hygiene has become normalized: vague agendas, unclear decision-making authority, too many attendees, and a default 30-or-60-minute duration regardless of actual need. Few organizations train people in running effective meetings, so bad habits compound.

Finally, knowledge workers increasingly value deep, focused work, and meetings represent the primary interruption to that state. As awareness of "flow" and cognitive load has grown, the opportunity cost of meetings feels more acute and worth complaining about.

The complaint, ultimately, reflects a broader reckoning with how we spend collective time.

Show the full input

370 words (input 246)

# The Meeting Paradox

Meetings are now the thing that people complain about most in the workplace, and this annoyance shows the deeper conflicts regarding the way we organise collaborative work. The situation has come about because of several factors having come together.

In the first place, digital calendars made it effortless to schedule meetings, getting rid of the natural limitation that had previously restricted how often they could take place; since arranging a meeting now only takes a few clicks, the psychological barrier to making a call vanishes and as a result there is exponential growth in the number of meetings without any corresponding increase in their value.

On the other hand, remote and hybrid working has paradoxically led to a greater reliance on meetings. Since there are no hallway chats or the usual casual checks on someone's desk, companies have made up for this by arranging formal meetings for kinds of interaction that used to take place spontaneously, filling their schedules with synchronous time and as a result disrupting concentration.

Third, there is a common misunderstanding regarding activity and productivity. Meetings provide visible proof that "work is being done"—they photograph well, lead to the creation of action items, and meet managers' need to show that they are exercising oversight. Because of this, they are appealing even though asynchronous communication could achieve the same objectives more efficiently.

Fourth, bad meeting habits have become the norm: the agendas are vague, it's not clear who has the authority to make decisions, there are too many people present, and the meeting length is always set at thirty or sixty minutes regardless of whether it's actually needed. Since few organizations provide training to people on how to run effective meetings, these poor practices tend to worsen.

In the end, knowledge workers are beginning to place a high value on deep and concentrated work, meeting being the main kind of interruption to that state. Since people have become more aware of the concept of 'flow' and cognitive load, the opportunity cost of holding meetings now seems more significant and is therefore something worth complaining about.

In the end the complaint shows a wider reckoning concerning the way in which we spend our collective time.

Show the full output
  • GPTZero0.00caught
  • Winston AI0.95passed
  • ZeroGPT1.00passed
  • Copyleaks1.00passed
  • Originality.ai1.00passed

Passed 4 of 5 detectors.

Every Grammarly run in September 2026 →

309 words (input 246)

Meetings are the gripe that shows up in every office chat, and that grumbling hints at something deeper about how we try to get people to work together.

When calendar apps made setting a meeting as easy as a couple of clicks, the old excuse of "I don't have time" vanished. Suddenly, calling a meeting cost nothing, so the number of invites blew up, even though the usefulness didn't keep pace.

Then remote‑first and hybrid setups arrived. Without the chance to bump into a colleague by the coffee machine, teams started penciling in formal slots for what used to happen in hallway banter. The result? Calendars jammed with back‑to‑back calls that keep the mind from settling on one task.

People also mix up "being busy" with "getting stuff done." A meeting puts a visible stamp on the day, a list of attendees, a stack of notes, a handful of action items, and that looks good to anyone who has to prove something got done. Often the same goal could be hit with a quick Slack message, but the meeting feels safer.

Bad meeting habits have turned into the norm. The agenda is vague, nobody knows who actually decides, the room fills up with too many names, and the default slot is a half‑hour or an hour even when the topic would need far less. Most companies never teach folks how to run a decent meeting, so the slip‑ups just pile on.

Meanwhile, a lot of knowledge workers crave long stretches of uninterrupted focus. Every call pops up like a sudden alarm, breaking that "flow" state and making the cost of each meeting feel sharper.

All in all, the endless complaints are really a sign that we're rethinking how we spend the hours we share. It's not just about the meetings themselves, but about the whole idea of collective time.

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 →

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 Grammarly better than Penlify?

Grammarly finished 23.8 points ahead of Penlify in the September 2026 cycle, 60.35 to 36.57, ranking #12 against #14 in a field of 14. Grammarly 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, Grammarly or Penlify?

Grammarly posted the higher bypass rate, 41.1 vs 0.0, and scored higher on 5 of 5 detectors. Grammarly led on GPTZero, Originality.ai, Copyleaks, Winston AI and ZeroGPT.

Do Grammarly and Penlify keep the original meaning?

Grammarly preserved meaning better, 86.4 vs 62.7 on our 0–100 similarity scale. On readability, Penlify rated higher, 71.8 vs 66.1. Penalties this cycle: Grammarly −3.0, Penlify −5.0.