HumanizerAI vs Grammarly: AI Humanizer vs Grammar Tool
Can Grammarly make AI-generated text undetectable? The short answer is no. Grammarly is an excellent grammar and writing tool, but it was not designed to bypass AI detectors. This 2026 comparison explains why HumanizerAI is the right tool if your goal is making AI content undetectable, and how both tools can work together.
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HumanizerAI vs Grammarly: Feature Comparison
Comparing a dedicated AI humanizer with the world's most popular grammar checker -- two different tools for different jobs.
| Feature | HumanizerAI | Grammarly |
|---|---|---|
| Starting Price | $7/mo | $12/mo (Premium) |
| AI Detection Bypass | 95%+ | Not supported |
| Built-in AI Detector | ||
| Humanization Modes | 3 modes | N/A (grammar tool) |
| Free Tier | ||
| Grammar Checking | ||
| Speed | Instant | Real-time |
| Language Support | 50+ languages | English focused |
What Is Grammarly?
Grammarly is the world's most popular writing assistant, used by over 30 million people daily. Founded in 2009, the platform has grown from a simple grammar checker into a comprehensive writing tool that covers grammar, spelling, punctuation, tone, clarity, and style. Grammarly is available as a browser extension, desktop app, mobile keyboard, and integrates with virtually every writing platform including Google Docs, Microsoft Word, email clients, and social media.
Grammarly offers a robust free tier that covers basic grammar and spelling checks, while the Premium plan at $12 per month adds advanced grammar rules, tone detection, clarity improvements, vocabulary suggestions, and plagiarism detection. The Business plan adds team features and brand tone customization. Grammarly recently added an AI writing assistant (GrammarlyGO) that can generate, rewrite, and edit text using AI, making it more of a full writing platform.
However, it is critical to understand that Grammarly is not an AI humanizer and was never designed to bypass AI detection. Grammarly's purpose is to improve the quality of your writing -- fixing grammar errors, improving clarity, and enhancing tone. It does not target the statistical patterns that AI detectors analyze. Running AI-generated text through Grammarly will give you grammatically polished AI text, but it will still be detectable by GPTZero, Turnitin, Originality.ai, and other AI detection tools. The grammatical improvements Grammarly makes do not address perplexity, burstiness, or the probability distributions that detectors rely on.
HumanizerAI: The Tool Grammarly Cannot Replace
HumanizerAI and Grammarly solve fundamentally different problems. Grammarly makes your writing better. HumanizerAI makes your AI-generated writing undetectable. These are complementary tools, not competitors. If you are using AI writing assistants like ChatGPT or Claude and need the output to pass AI detection, Grammarly cannot help you -- but HumanizerAI can, with a 95%+ bypass rate across all major detectors.
HumanizerAI works by targeting the deep statistical patterns that identify text as AI-generated. While Grammarly polishes surface-level features like grammar and word choice, HumanizerAI modifies the perplexity, burstiness, and sentence probability distributions that AI detectors actually measure. This is why humanized text passes detection while grammatically corrected text does not. The two tools operate on completely different dimensions of text quality.
At $7 per month, HumanizerAI is also more affordable than Grammarly Premium ($12/month). Many users find the ideal workflow is to use HumanizerAI to make their AI content undetectable, then optionally run it through Grammarly for a final grammar polish. This combination gives you content that is both undetectable and grammatically flawless. But if you can only choose one tool and your priority is passing AI detection, HumanizerAI is the one you need.
Key Differences Between HumanizerAI and Grammarly
Core Purpose: AI Detection Bypass vs Grammar Correction
This is the fundamental distinction. HumanizerAI exists to make AI-generated content pass AI detection tools. Grammarly exists to improve writing quality through grammar, spelling, punctuation, and style corrections. These are entirely different objectives. Grammarly has zero AI detection bypass capability because it was never designed for that purpose. Searching for "Grammarly AI humanizer" or "bypass AI detection with Grammarly" will lead to disappointment -- it simply does not do this. HumanizerAI, with its 95%+ bypass rate, was built specifically for this use case.
AI Detection Bypass Performance
HumanizerAI achieves 95%+ bypass rates against GPTZero, Turnitin, Originality.ai, Copyleaks, and ZeroGPT. Grammarly has a 0% bypass rate because it does not attempt to bypass AI detection at all. Running AI text through Grammarly may slightly alter detection scores due to sentence restructuring, but the text will still be identified as AI-generated by modern detectors. The two tools are not even comparable on this dimension -- Grammarly simply does not play in this space.
Built-in AI Detection
HumanizerAI includes a built-in AI detector that lets you check your content against multiple detection engines before and after humanization. Grammarly does not include any AI detection functionality. Grammarly recently added an AI-generated text indicator through its business plans, but this is a basic feature rather than a comprehensive detection tool. For users who need to verify their content passes AI detection, HumanizerAI provides an integrated solution.
Pricing Comparison
HumanizerAI costs $7 per month while Grammarly Premium is $12 per month. However, comparing prices directly is somewhat misleading because these tools serve different purposes. The more relevant comparison is value-for-purpose: if you need AI detection bypass, HumanizerAI at $7/month is infinitely better value than Grammarly at $12/month, because Grammarly cannot bypass detection at all. If you need grammar correction, Grammarly is worth its price. Ideally, you would use both for $19/month for both tools -- less than what Undetectable AI alone charges.
Writing Improvement Features
Grammarly clearly wins on writing improvement features. It offers grammar checking, spelling correction, punctuation fixes, tone detection, clarity suggestions, vocabulary enhancements, and plagiarism detection. HumanizerAI focuses specifically on AI humanization and detection. It is not a grammar checker. If you want both capabilities, the smart approach is to use HumanizerAI for humanization and Grammarly for grammar -- they complement each other rather than competing.
Platform Availability
Grammarly has a significant advantage in platform integration. It works as a browser extension, desktop app, mobile keyboard, and integrates with dozens of writing platforms. HumanizerAI is a web-based tool accessible through any browser. While Grammarly's ubiquitous presence makes it easy to use everywhere you write, HumanizerAI's web interface is perfectly suited for its use case -- you typically humanize content in batch before publishing or submitting, so deep platform integration is less critical.
The Complementary Workflow
Rather than choosing between HumanizerAI and Grammarly, the best approach for AI content creators is to use both. The optimal workflow is: (1) Generate content with your AI writing tool of choice, (2) Run it through HumanizerAI to make it undetectable, (3) Polish the final version with Grammarly for grammar and style. This three-step process gives you content that is both undetectable and professionally polished. At $7 + $12 = $19/month for both tools, this is still cheaper than many single-purpose AI humanizers.
Try HumanizerAI for Free
Grammarly fixes your grammar. HumanizerAI makes your AI text undetectable. Try it now -- paste any AI-generated text and see the difference.
Results vary by text type. Review output before use.
Frequently Asked Questions: HumanizerAI vs Grammarly
Can Grammarly bypass AI detectors like GPTZero?
No. Grammarly is a grammar and writing improvement tool -- it has zero AI detection bypass capability. Running AI-generated text through Grammarly will give you grammatically correct AI text, but it will still be detected as AI-generated by tools like GPTZero, Turnitin, and Originality.ai. For AI detection bypass, you need a purpose-built tool like HumanizerAI.
Should I use HumanizerAI or Grammarly?
It depends on your goal. If you need to bypass AI detection, use HumanizerAI -- Grammarly cannot do this. If you need grammar and writing improvements, use Grammarly. Ideally, use both: HumanizerAI first to make content undetectable, then Grammarly for a final grammar polish. Together they cost $19/month, still less than many single-purpose AI humanizers.
Can I use HumanizerAI and Grammarly together?
Yes, and this is actually the recommended workflow for best results. First, humanize your AI-generated text with HumanizerAI to make it undetectable. Then run the humanized text through Grammarly for grammar, spelling, and style improvements. This gives you content that passes AI detection and is also professionally polished.
Does Grammarly detect AI-generated content?
Grammarly has introduced limited AI detection indicators in some of its business-tier plans, but it is not a comprehensive AI detection tool. It does not provide detailed detection scores or check against multiple detection engines like HumanizerAI's built-in detector does. For thorough AI detection checking, HumanizerAI provides a more complete solution.
Why do people search for "Grammarly AI humanizer"?
Many users are familiar with Grammarly as a text improvement tool and hope it can also make AI text undetectable. However, grammar correction and AI humanization are fundamentally different tasks. Grammarly improves text quality through grammar rules. AI humanization modifies the statistical patterns that detectors measure -- perplexity, burstiness, and probability distributions. These require completely different algorithms.
Is HumanizerAI cheaper than Grammarly?
Yes. HumanizerAI costs $7 per month while Grammarly Premium costs $12 per month. However, these tools serve different purposes so direct price comparison is somewhat misleading. If you need AI detection bypass (which Grammarly cannot do), HumanizerAI at $7/month provides the capability you need. Many users subscribe to both for a combined $19/month.
Need to Bypass AI Detectors? Grammarly Cannot Help.
HumanizerAI is the tool you need. 95%+ bypass rate, built-in detection, starting at just $7/month. Try it free.