# GPT-Zero vs Grammarly

GPT-Zero records 1,740 monthly visits with +564.1% month-over-month growth and Freemium pricing. Grammarly records 58,867,412 monthly visits with -1.5% growth and Freemium pricing.

| Metric | [GPT-Zero](https://openaitools.app/tool/gpt-zero) | [Grammarly](https://openaitools.app/tool/grammarly) |
| :--- | :--- | :--- |
| Website URL | https://gpt-zero.cc | https://www.grammarly.com |
| Categories | AI Content Detector, AI Detector, AI Checker, AI Plagiarism Checker | AI Writing Assistants, AI Writing, AI Grammar Checker, AI Text Generator |
| Pricing Model | Freemium | Freemium |
| Monthly Visits | 1,740 | 58,867,412 |
| MoM Growth Rate | +564.1% | -1.5% |
| Primary Market | Argentina | United States |
| Direct Visits | 689 | 25,398,749 |
| Review Score | 3.4 | 4.4 |
| Saved Count | 3 | 74 |
| Supported Platforms | Website | Website |

## GPT-Zero

GPT-Zero.cc is a lightweight web tool built around a single job: telling you whether a block of text reads as AI-generated. You paste the passage into the detector, submit it, and the tool returns an assessment based on its own detection algorithm. The site describes that algorithm as being developed and continuously refined against a corpus of more than a million articles and text samples written by both humans and AI systems.

Capability-wise, the detector targets the current generation of large language models — ChatGPT, GPT-4, GPT-3 and GPT-2 as well as LLaMA — and processes roughly 2,000 characters per run. The interface is deliberately minimal: a home page with a text field, a short explanation of why the tool exists, a features breakdown, user testimonials, an FAQ and a blog. There is no dashboard, no document manager and no team workspace, which keeps the barrier to entry at zero.

The honest caveat the site itself raises is accuracy. AI detectors produce probability estimates, not verdicts, and short samples are inherently harder to classify than long ones. Used as one signal among several — alongside revision history, source citations and a conversation with the writer — GPT-Zero is a quick and genuinely useful first filter for teachers, editors, marketers and anyone reviewing bulk submissions. Note that gpt-zero.cc is an independent detector and is not the same product as GPTZero.

**Pricing & Plans:** Free to use. The site markets GPT-Zero as a free AI content detector and shows no paid subscription tiers, credit packs or account requirement in its navigation. It does not publish a formal pricing table, so confirm current limits on the live site.

- **AI text detection:** The detector returns an assessment of how much of a submitted passage reads as AI-generated, based on a model trained on a very large mixed corpus of human and machine text.
- **Fast single-pass checks:** Runs complete in seconds so you can screen drafts, student essays or client copy during your normal editing pass.
- **Long-sample capacity:** Each submission handles roughly 2,000 characters at once, enough for an abstract, an email, a product description or an article excerpt.
- **Simple, no-friction workflow:** The detector is built for anyone who needs a quick authenticity read rather than a forensic report, with no complex setup or account requirements.
- **Educational blog content:** A regularly updated blog covers AI trends, predictive analytics and the evolving challenge of telling generated text apart from human writing.

**Strengths:** No account or payment required before you can run a check; Covers the major model families including GPT-4, GPT-3, GPT-2 and LLaMA; Processes about 2,000 characters per submission, enough for most excerpts; Backed by an explanatory blog and an FAQ that set realistic accuracy expectations

**Limitations:** Detection is probabilistic and both FAQ and product pages admit results are not 100% accurate; Short text samples are less reliable than long-form documents; Input is capped around 2,000 characters per run, so very long documents need splitting; Unrelated tag data (donations, memberships, stream alerts) does not match what this product actually does

[Profile (Markdown)](https://openaitools.app/tool/gpt-zero.md)

## Grammarly

Grammarly is the world's most widely deployed AI writing and communication platform, trusted by more than 40 million daily users and 50,000 organizations including Atlassian, Databricks, and Zoom. Operating as a persistent overlay across over 500,000 web applications, desktop programs (Windows and macOS), Microsoft Office, Google Docs, and iOS/Android keyboards, Grammarly analyzes text in real time to eliminate grammatical errors, streamline wordy phrasing, and calibrate tone to match the writer's intent. Following its corporate evolution under the Superhuman Platform umbrella alongside Superhuman Mail and Coda, Grammarly has expanded from a personal proofreader into an enterprise-grade proactive AI communication suite.

In 2026, Grammarly goes well beyond red-underline spellchecking with a suite of specialized AI Agents and document integrity tools. Writers can invoke purpose-built agents—including AI Grader, Citation Finder, Reader Reactions, and Paraphraser—alongside generative AI drafting directly inline where they work. To address academic and professional transparency in the generative AI era, Grammarly offers built-in Plagiarism Detection, an AI Detector, and Grammarly Authorship, which tracks how a document was constructed by automatically categorizing text as human-typed, pasted from external sources, or generated/modified with AI. For teams, Grammarly enforces organizational consistency through custom Style Guides, Brand Tones, reusable Snippets, and Knowledge Share.

Grammarly simplified its subscription structure by consolidating its legacy individual 'Premium' and team 'Business' offerings into a single unified tier: Grammarly Pro. The Free plan ($0/month) covers essential spelling, punctuation, basic tone visibility, and 100 generative AI prompts per month. Grammarly Pro is priced at $12/member/month when billed annually ($144/year) or $30/member/month when billed monthly ($60 quarterly), unlocking unlimited personalized fluency suggestions, full-sentence rewrites, tone adjustment, citation formatting, plagiarism and AI detection, 1 team style guide, and 2,000 generative AI prompts per member each month. Large organizations opt for Grammarly Enterprise (available with Superhuman Go) for unlimited AI prompts, SAML SSO, SCIM provisioning, Data Loss Prevention (DLP), and Bring Your Own Key (BYOK) encryption.

**Pricing & Plans:** Free plan ($0/month) includes core grammar and spelling checks, tone detection, and 100 generative AI prompts/month; Grammarly Pro costs $12/member/month billed annually ($144/year, or $30/month billed monthly) with full-sentence rewrites, plagiarism/AI detection, team style guides, and 2,000 AI prompts/month, while Enterprise offers custom pricing with unlimited AI prompts and BYOK security.

- **Ubiquitous Inline Rewriting & Tone Calibration:** Works natively inside Chrome, Safari, Firefox, Edge, Windows, Mac, Google Docs, MS Office, and mobile keyboards to flag grammar mistakes, rewrite tangled sentences, and shift tone toward confident, empathetic, or executive registers.
- **Specialized AI Agents (AI Grader, Citation Finder & Reader Reactions):** Deploys contextual AI agents that predict how a target audience will react to a draft, locate credible supporting citations, grade essays against rubric criteria, and generate drafts using up to 2,000 monthly prompts on Pro.
- **Grammarly Authorship, AI Detector & Plagiarism Checker:** Scans text against billions of web pages and academic databases for accidental plagiarism, detects AI-generated passages, and logs transparent document provenance via Authorship reports in Google Docs and Word.
- **Team Style Guides, Brand Tones & Knowledge Share:** Enables teams on Pro and Enterprise plans to codify company terminology, ban deprecated jargon, enforce inclusive language, insert shared Snippets, and surface internal company definitions inline.
- **Enterprise Security, DLP & Superhuman Platform Governance:** Protects organizational data with SOC 2 Type 2 attestation, SAML SSO, SCIM lifecycle management, Confidential Mode, Data Loss Prevention controls, Audit Logs API, and customer-managed BYOK encryption.

**Strengths:** Frictionless cross-platform integration works inside virtually every browser, desktop app, email client, and mobile OS without copy-pasting into a separate chatbot.; Consolidating Premium and Business into Grammarly Pro ($12/member/month annual) gives individuals and small teams access to style guides, analytics, and plagiarism/AI detection in one plan.; Grammarly Authorship provides a constructive, transparent audit trail for students and writers to demonstrate human writing integrity alongside responsible AI editing.; Mature enterprise security posture featuring BYOK encryption, Data Loss Prevention, and granular application/domain blocklists.

**Limitations:** Month-to-month billing on Grammarly Pro is steep at $30/member/month compared to the $12/member/month annual commitment ($144 billed upfront).; Core writing intelligence and style rules remain primarily optimized for English dialects (US, UK, Canadian, Australian, Indian) rather than native multilingual grammar checking.; Aggressive inline underlines and pop-up agent cards can feel visually intrusive in dense technical documents or code-heavy web editors unless muted per domain.

[Profile (Markdown)](https://openaitools.app/tool/grammarly.md)

## Frequently Asked Questions

### How do GPT-Zero and Grammarly compare in monthly traffic?

GPT-Zero has 1,740 monthly visits, while Grammarly has 58,867,412. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

GPT-Zero has a month-over-month growth rate of +564.1%; Grammarly has -1.5%.

### How does pricing compare?

GPT-Zero: Freemium. Free to use. The site markets GPT-Zero as a free AI content detector and shows no paid subscription tiers, credit packs or account requirement in its navigation. It does not publish a formal pricing table, so confirm current limits on the live site. Grammarly: Freemium. Free plan ($0/month) includes core grammar and spelling checks, tone detection, and 100 generative AI prompts/month; Grammarly Pro costs $12/member/month billed annually ($144/year, or $30/month billed monthly) with full-sentence rewrites, plagiarism/AI detection, team style guides, and 2,000 AI prompts/month, while Enterprise offers custom pricing with unlimited AI prompts and BYOK security.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [DeepL](https://openaitools.app/tool/deepl) | 95,110,871 | -1.7% | Freemium | Outstanding for context-aware translation and professional writing refinement, but not designed as a dedicated grammar checker. | [.md](https://openaitools.app/tool/deepl.md) |
| 2 | [QuillBot Paraphraser](https://openaitools.app/tool/quillbot-paraphraser) | 36,630,337 | +2.3% | Freemium | Excels at heavy paraphrasing and text rewriting, but offers less seamless inline real-time proofreading across all apps. | [.md](https://openaitools.app/tool/quillbot-paraphraser.md) |
| 3 | [ZeroGPT](https://openaitools.app/tool/zerogpt) | 32,864,541 | +19.7% | Freemium, Paid | AI content detection and a full writing toolkit in one place | [.md](https://openaitools.app/tool/zerogpt.md) |
| 4 | [GPTZero](https://openaitools.app/tool/gptzero-me) | 23,246,989 | +32.5% | Freemium, Paid | AI detection and writing verification built for schools and editors | [.md](https://openaitools.app/tool/gptzero-me.md) |
| 5 | [LanguageTool](https://openaitools.app/tool/languagetool) | 5,707,795 | -4.2% | Freemium | Provides strong multilingual grammar and style checking across apps, but offers fewer advanced generative AI features. | [.md](https://openaitools.app/tool/languagetool.md) |
| 6 | [Undetectable AI](https://openaitools.app/tool/undetectable-ai) | 3,113,403 | +17.5% | Freemium | Detect, humanize and verify AI content in one place | [.md](https://openaitools.app/tool/undetectable-ai.md) |
| 7 | [Originality.ai](https://openaitools.app/tool/originality) | 2,049,639 | +2.8% | Paid | AI detector, plagiarism and content-quality checks in one scan | [.md](https://openaitools.app/tool/originality.md) |
| 8 | [ProWritingAid](https://openaitools.app/tool/prowritingaid-com) | 1,623,266 | +17.6% | Freemium, Paid | Delivers deeper manuscript analysis and structural reports, but has a steeper learning curve than Grammarly. | [.md](https://openaitools.app/tool/prowritingaid-com.md) |
| 9 | [Paperpal](https://openaitools.app/tool/paperpal) | 1,111,641 | +1.7% | Freemium | AI academic writing assistant that edits, cites, and checks your manuscript right where you write | [.md](https://openaitools.app/tool/paperpal.md) |
| 10 | [Isgen AI Detector](https://openaitools.app/tool/isgen-ai) | 901,917 | +5.8% | Freemium | Multilingual AI detector with sentence-level insight | [.md](https://openaitools.app/tool/isgen-ai.md) |

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Source: https://openaitools.app/compare/gpt-zero-vs-grammarly

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