WriteHuman, a better alternative to Grammarly
WriteHuman vs Grammarly: real-world performance
WriteHuman ranked #1 of 14 humanizers tested in September 2026
HumanizerBench is a public benchmark that re-tests every major AI humanizer each month. Each tool is paid for and run by hand on the same prompts, then scored against 5 major AI detectors on how human the output reads, how well it keeps the original meaning, and how cleanly it's written. Every prompt, output, and detector score is published.
Tested September 202633 samples462 tests5 AI detectors
| Metric | WriteHuman | Grammarly |
|---|---|---|
Overall score Composite out of 100. Weights AI-detector results 42%, meaning 32%, readability 16%, and consistency 10%, then subtracts quality penalties. | 78.29 | 60.35 |
AI-detector pass rate Share of checks where the output read as human-written, across all 5 AI detectors. | 90.1% | 41.1% |
Consistency How steady the scores stay across different kinds of writing. | 82.1% | 78.7% |
Quality penalties Points deducted from the overall score for quality issues like length inflation or meaning drift. Lower is worse. | No penalties | -3 pts |
AI-detector pass rate, by detector Share of checks on each detector where WriteHuman's output read as human-written. Showing detectors where WriteHuman scores higher. | ||
GPTZero | 71.8% | 15.9% |
Winston AI | 84.1% | 38.9% |
ZeroGPT | 77.8% | 58.0% |
Copyleaks | 86.7% | 60.3% |
Originality.ai | 91.4% | 43.4% |
Score by content type Benchmark score by writing category. Showing categories where WriteHuman scores higher. | ||
Blog posts | 99.4% | 65.8% |
News articles | 89.2% | 41.1% |
Marketing copy | 99.3% | 29.7% |
Discussion posts | 100.0% | 47.5% |
Scoring methodology ↗See the full head-to-head on HumanizerBench ↗
WriteHuman vs Grammarly in 60 seconds
The headline differences. Detailed analysis below.
- Starting price
- $20/mo Basic
- Free tier
- Free to use, no signup, no card
- Standout
- Ranked first of the fourteen humanizers in the September 2026 HumanizerBench cycle with a 78.29 composite, ahead of Grammarly on all five AI detectors, on its entry-level Basic plan
- Starting price
- Pro $30/mo
- Free tier
- Free: 100 AI prompts/mo
- Watch for
- A grammar, spelling, and tone checker, not a humanizer
Bottom line: For humanizing AI-assisted writing, Grammarly is the wrong tool: it cleans up grammar but leaves most of the patterns detectors flag. WriteHuman is built for that job and finished first in the September 2026 benchmark, a 90.1% AI-detector pass rate to Grammarly's 41.1%.
Two different jobs
Grammarly is a grammar checker, not a humanizer
Grammarly is a grammar, spelling, and tone checker, and a capable one. It edits the surface of your writing, fixing punctuation, word choice, and phrasing. What it does not reliably do is move the statistical patterns AI detectors actually read, and the September 2026 HumanizerBench cycle puts a number on that: a 41.1% AI-detector pass rate, so most of its rewrites still read as AI.
That is the core mismatch. Making an AI-assisted draft read as human-written is a different job from cleaning up grammar, and Grammarly is not built for it. In the same cycle WriteHuman finished first of the fourteen humanizers tested, scoring 78.29 on the overall composite to Grammarly's 60.35.
Grammarly's composite score in the September 2026 cycle.
WriteHuman's composite score in the same cycle, first of fourteen humanizers tested.
Detector results
Polished writing that still reads as AI to all five detectors
In the September 2026 benchmark, Grammarly's rewrites came out at a 41.1% AI-detector pass rate, and no detector on the panel scored its output higher than 60.3%: GPTZero 15.9%, Winston AI 38.9%, Originality.ai 43.4%, ZeroGPT 58.0%, and Copyleaks 60.3%. Polishing grammar only moves that needle so far.
WriteHuman posted a 90.1% AI-detector pass rate over the same cycle and led Grammarly on every one of the five detectors: GPTZero 71.8%, Winston AI 84.1%, ZeroGPT 77.8%, Copyleaks 86.7%, and Originality.ai 91.4%. The built-in AI detector lives in the same view as the humanizer and is tuned to closely match GPTZero, Originality.ai, Copyleaks, ZeroGPT, and Winston AI, so you can see roughly where a passage will land before you publish it.
Grammarly's AI-detector pass rate in the September 2026 cycle.
WriteHuman's pass rate in the same cycle, ahead of Grammarly on all five detectors.
Content types
Behind on every content type in the comparison
The September cycle runs 33 samples per tool, 462 tests in all, and breaks its scores out by content type. Grammarly trailed WriteHuman on all four of the content types in the comparison above: blog posts, news articles, marketing copy, and discussion posts. There is no format where a grammar pass alone changes how a draft reads to a detector.
WriteHuman finished ahead of Grammarly in all four of those categories in the same cycle: 99.4% on blog posts against 65.8%, 89.2% on news articles against 41.1%, 99.3% on marketing copy against 29.7%, and 100.0% on discussion posts against 47.5%. That is the difference between editing the surface of a draft and rewriting how it is built.
Grammarly's weakest content category in the cycle, marketing copy, where WriteHuman scored 99.3%.
WriteHuman's pass rate on marketing copy, one of four categories where it finished ahead of Grammarly in the same cycle.
The WriteHuman difference
How WriteHuman makes AI writing read human
WriteHuman rewrites at the structural level: sentence rhythm, burstiness, transitions, and idiom all shift, while your vocabulary, citations, and quotes stay intact and the word count stays close to the original. That is the change that actually moves how a detector scores a passage.
You can run it free on writehuman.ai with no signup, no email, and no card. Every paid plan adds the built-in AI detector in the same view, so you check the score before you publish. Plans are $20/mo Basic, $29/mo Pro, and $59/mo Ultra, across 50+ languages, with a public REST API and two-click cancellation.
Grammarly's GPTZero score in the September 2026 cycle, after a full grammar and clarity pass.
WriteHuman's GPTZero score in the same cycle, more than four times Grammarly's.
Pricing: WriteHuman vs Grammarly
Side-by-side plans. WriteHuman's free tier is on the homepage. No signup needed.
Free
$0
Try the humanizer with daily limits, no signup
- No credit card
- Daily request cap
- Built-in AI detector access
Basic
$20/mo
80 humanizations / month, up to 600 words each
- 2 output variations
- 160 AI detector checks / mo
- Cancel anytime
Pro
$29/mo
200 humanizations / month, up to 1,200 words each
- 3 output variations
- 400 AI detector checks / mo
- Priority support
Ultra
$59/mo
Unlimited humanizations, up to 3,000 words each
- 5 output variations
- Unlimited AI detector checks
- Priority support
Free
$0
100 AI prompts/mo, grammar and tone checks
Pro
$30/mo
2,000 AI prompts/mo, rewrites and tone tools
Enterprise
Custom
Unlimited prompts, admin controls and security
Pricing verified as of . For the latest Grammarly pricing, see grammarly.com.
Feature Comparison
See how WriteHuman stacks up against Grammarly, feature by feature.
What real Grammarly users are saying
Quotes pulled from public reviews on Reddit, Trustpilot, G2, and Product Hunt.
“Sometimes the suggestions overcorrect or miss nuance in tone/brand voice even with custom setups, making AI rewrites sound a bit generic or off.”
“Very large documents cause the service to lag considerably.”
“There are a lot of words which I spell incorrectly and Grammarly doesn't know what I am trying to spell so it doesn't have any suggestions.”
Why writers pick WriteHuman
The everyday reasons writers switch to WriteHuman from Grammarly.
Pick WriteHuman if…
- An AI-assisted draft needs to read as human-written to GPTZero, Originality.ai, Copyleaks, ZeroGPT, or Winston AI.
- You want structural rewriting that shifts sentence rhythm and flow, not just a surface-level polish.
- You want to see roughly where a passage will score on the major detectors before you publish, in the same view.
- You work in one of 50+ languages and want a humanizer that covers all of them.
- You want straightforward, self-serve pricing with two-click cancellation.
Pick Grammarly if…
- You want a grammar, spelling, and tone checker for everyday writing.
- You want real-time suggestions as you type across email, docs, and the browser.
- Your goal is to tighten writing you already consider human, not to change how a draft reads to a detector.
Why users switch from Grammarly
Real pain points Grammarly users run into, and how WriteHuman solves each one.
In the September 2026 benchmark, Grammarly's rewrites scored a 41.1% AI-detector pass rate, so most of them still read as AI.
WriteHuman posted a 90.1% AI-detector pass rate in the same cycle, the highest pass rate of the fourteen humanizers tested.
Grammarly works at the surface level (grammar, clarity, tone) and does not restructure prose, which is what detectors actually key on.
WriteHuman rewrites at the structural level (sentence rhythm, burstiness, transitions) while keeping vocabulary, citations, and quotes intact.
Grammarly's AI Humanizer is a clarity and phrasing pass, and it finished 12th of the fourteen humanizers ranked in the September 2026 cycle with a 60.35 composite.
WriteHuman supports 50+ languages and is purpose-built to make AI-assisted drafts read as natural, human-written text.
Across all four content types in the September 2026 comparison, blog posts, news articles, marketing copy, and discussion posts, Grammarly trailed WriteHuman, bottoming out at 29.7% on marketing copy.
WriteHuman finished ahead of Grammarly in all four categories in the same cycle: 99.4% on blog posts, 89.2% on news articles, 99.3% on marketing copy, and 100.0% on discussion posts.
No detector on the September 2026 panel scored its output above 60.3%: GPTZero 15.9%, Winston AI 38.9%, Originality.ai 43.4%, ZeroGPT 58.0%, Copyleaks 60.3%.
WriteHuman scored 78.29 in the September 2026 HumanizerBench cycle, first of the fourteen humanizers tested and ahead of Grammarly on all five AI detectors.
Frequently asked: WriteHuman vs Grammarly
Is WriteHuman a good Grammarly alternative?
Why does Grammarly's output still read as AI to detectors?
Does Grammarly have an AI Humanizer, and how is it different from WriteHuman?
How much does each tool cost?
Can I use Grammarly and WriteHuman together?
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