Does Grammarly Have an AI Humanizer? (2026 Comparison)

Understand what Grammarly’s AI rewrite tools offer, how they differ from AI detectors, and how they compare with dedicated humanizers.

Short answer

Yes, Grammarly offers AI rewrite capabilities inside its writing assistant (under features like “Rewrite with AI” and tone adjustment prompts, verified October 2026). It is part of an expansive editing suite that includes grammar, spelling, clarity, and tone suggestions. Open AI Humanizer is a separate, free, browser-based, rule-based tool that rewrites AI drafts to read more naturally that needs no account and keeps mathematical formulas and academic citations intact.

What does Grammarly’s humanizer do?

Grammarly allows users to highlight text and apply generative AI transformations to make sentences more concise, formal, or casual. It operates directly within web browsers, Microsoft Word, Google Docs, and email clients. Free accounts receive 100 AI prompt credits per month, while Premium accounts ($12/month annual or $30/month monthly) receive 1,000 prompt credits (verified October 2026).

Grammarly’s AI detector vs its humanizer

Writers often confuse Grammarly's detection features with its rewrite tools:

The AI Detector: Analyzes text and calculates the statistical probability that a section was generated by an LLM. A detector score does not provide edits or rewrite the prose.

The Humanizer / AI Rewrite Tool: Actually alters words and sentence structure to change tone or readability. Rewriting text does not guarantee any third-party detector will score it as human.

Side-by-side comparison

Feature	Open AI Humanizer	Grammarly
Main purpose	Humanizing AI drafts	Full writing assistant (Grammar, tone, clarity)
Account needed	No	Yes (Mandatory registration)
Price	Free	Free plan (100 prompts) / $12–$30/mo (verified Oct 2026)
Formula and citation protection	Yes ($E=mc^2$, \cite{}, code)	Limited (May flag math syntax as grammar errors)
Where text is processed	In your browser (Client-side)	Grammarly cloud servers
Grammar and tone checks	Offline deterministic cleanup only	Yes (Enterprise-grade grammar & tone scoring)
Works inside Word, Docs and email	Browser web app	Yes (Native desktop apps, Chrome & Word add-ins)

When Grammarly is the better choice

You already use Grammarly across Google Docs, Microsoft Word, or your email client and prefer in-line suggestions.
You want comprehensive grammar, punctuation, passive voice, and tone suggestions in addition to paraphrasing.
You manage corporate team communications and need unified style guides.

When Open AI Humanizer is the better choice

You want a free, no-login tool for a fast rewrite without subscribing or hitting monthly prompt caps.
Your text contains scientific LaTeX equations, academic citations, or code snippets that must stay intact.
You require deterministic, reproducible results with full browser-level data privacy.

Frequently Asked Questions

Does Grammarly have a humanizer?

Yes. Grammarly incorporates an AI rewrite feature (formerly GrammarlyGO) within its writing assistant. Users can select AI-generated text and request tonal adjustments, conciseness improvements, or natural rephrasing (verified October 2026).

Is Grammarly’s humanizer free?

Grammarly provides free users with 100 AI prompts per month. To unlock 1,000 AI prompts and advanced tonal restructuring, users must subscribe to Grammarly Premium ($12/month billed annually or $30/month billed monthly, verified October 2026). Open AI Humanizer is 100% free with no monthly prompt quotas.

Can Grammarly’s detector flag humanized text?

Yes. Like all statistical classifiers, Grammarly's AI detector evaluates text predictability. Any detector can flag or miss text regardless of whether it was written by an AI or human, which is why scores should not be treated as disciplinary guarantees.

Can I use both?

Yes. A recommended workflow is to use Open AI Humanizer to restructure sentence burstiness and remove repetitive LLM transitions, then run Grammarly to perform a final proofreading check for typos and commas.

Compare Other Writing Platforms

Compare Open AI Humanizer with QuillBot or check our breakdown of how AI detectors work.

Use Free AI Humanizer

Not affiliated with OpenAI, QuillBot, GPTZero, Undetectable AI or Grammarly.