# Grammarly vs WriteABookAI

Grammarly records 58,867,412 monthly visits with -1.5% month-over-month growth and Freemium pricing. WriteABookAI records 6,885 monthly visits with -14.1% growth and One-time purchase (no subscription) pricing.

| Metric | [Grammarly](https://openaitools.app/tool/grammarly) | [WriteABookAI](https://openaitools.app/tool/writeabookai) |
| :--- | :--- | :--- |
| Website URL | https://www.grammarly.com | https://writeabookai.com |
| Categories | AI Writing Assistants, AI Writing, AI Grammar Checker, AI Text Generator | AI Book Writing, AI Ebook Generator, AI Writing |
| Pricing Model | Freemium | One-time purchase (no subscription) |
| Monthly Visits | 58,867,412 | 6,885 |
| MoM Growth Rate | -1.5% | -14.1% |
| Primary Market | United States | United States |
| Direct Visits | 25,398,749 | 2,670 |
| Review Score | 4.4 | 4.2 |
| Saved Count | 74 | 0 |
| Supported Platforms | Website | Website |

## 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)

## WriteABookAI

WriteABookAI is positioned as an AI-native platform specifically for non-fiction books rather than a general writing assistant. The workflow has four stages. First you describe your expertise and intended audience, and the system proposes a structure suited to your genre. Second, it generates a complete outline with chapters and key points. Third, you draft chapter by chapter with AI support, accepting, modifying or rejecting suggestions as you go. Fourth, you export a formatted manuscript in EPUB, PDF, Word or Markdown ready for self-publishing, a traditional publisher or corporate distribution.

The feature set is built around long-form context. Outline generation understands book conventions for business books, self-help guides and technical manuals. Drafting is chapter-aware, so the model keeps terminology and tone consistent across the entire manuscript instead of treating each section in isolation. Autocomplete offers real-time suggestions as you type, and rewriting helps refine clarity and flow in any passage. Native support covers ten languages including English, Spanish, French, German, Italian, Portuguese, Dutch, Chinese, Japanese and Korean, and the site states the engine now runs on the latest generation of Google Gemini models.

Commercials are deliberately simple: the site advertises paying once rather than subscribing, with plan options sized to your book's length and a dedicated access timeframe, plus a 30-day refund window for buyers who change their minds before writing or exporting most of the book. The product is made in Switzerland and is clearly aimed at busy professionals who already have the knowledge but lack the time to write a full manuscript.

If you want extra polish, exporting to Markdown or Word lets you take the manuscript into a professional editing or formatting tool afterwards.

**Pricing & Plans:** WriteABookAI advertises a one-time purchase instead of a subscription, with no hidden fees. Plan options are sized to your book's length and grant a dedicated access timeframe plus permanent availability of your saved work for viewing and export. Specific prices are shown as dynamic options on the pricing page. A 30-day refund is offered provided you have not written most of the book or already exported it.

- **Smart outline generation:** Describe your expertise and target readers, and the platform proposes chapter structures with key points built for your genre and audience.
- **Chapter-aware drafting:** The AI expands an outline into full chapters while carrying context across the whole manuscript for consistent tone and terminology.
- **In-line autocomplete:** Predictive suggestions appear as you type, helping you keep momentum and push past blank-page moments during long writing sessions.
- **Intelligent rewriting:** Select any passage and request a rewrite to improve clarity, flow and professional presentation without leaving the editor.
- **Multilingual output and export:** Produce manuscripts in 10 languages and export them as EPUB, PDF, Word or Markdown with publication-ready typography and layout.

**Strengths:** Purpose-built for book-length non-fiction rather than repurposed chat output; Outline-first workflow keeps structure and argument coherent as the manuscript grows; Full user control: accept, modify or reject any AI suggestion; Native writing support in ten languages

**Limitations:** One-time plans are tied to a defined access timeframe rather than permanent lifetime access; Focused on non-fiction only, so novelists and fiction authors are not served; Quality still depends on how much subject expertise you feed it; Refunds are declined once a large part of the book is written or exported

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

## Frequently Asked Questions

### How do Grammarly and WriteABookAI compare in monthly traffic?

Grammarly has 58,867,412 monthly visits, while WriteABookAI has 6,885. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

Grammarly has a month-over-month growth rate of -1.5%; WriteABookAI has -14.1%.

### How does pricing compare?

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. WriteABookAI: One-time purchase (no subscription). WriteABookAI advertises a one-time purchase instead of a subscription, with no hidden fees. Plan options are sized to your book's length and grant a dedicated access timeframe plus permanent availability of your saved work for viewing and export. Specific prices are shown as dynamic options on the pricing page. A 30-day refund is offered provided you have not written most of the book or already exported it.

## 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 | [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) |
| 4 | [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) |
| 5 | [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) |
| 6 | [Hemingway Editor](https://openaitools.app/tool/hemingway-editor) | 605,169 | -8.6% | Free Trial, Paid, Free | Highlights readability and sentence complexity visually, but lacks automated grammar correction and browser-wide extension support. | [.md](https://openaitools.app/tool/hemingway-editor.md) |
| 7 | [Wordtune](https://openaitools.app/tool/wordtune) | 368,771 | -5.8% | Freemium, Free Trial | Great for sentence-level tone adjustments and rewriting, but less comprehensive for standalone grammar rules and style guides. | [.md](https://openaitools.app/tool/wordtune.md) |
| 8 | [Dabble](https://openaitools.app/tool/dabble-book-writing-software) | 286,774 | -26.3% | Free Trial, Paid | Book writing software that keeps your whole novel in one place | [.md](https://openaitools.app/tool/dabble-book-writing-software.md) |
| 9 | [HyperWrite](https://openaitools.app/tool/hyperwrite-ai) | 255,429 | +34.4% | Freemium | AI writing assistant with autocomplete, research, and a Chrome extension | [.md](https://openaitools.app/tool/hyperwrite-ai.md) |
| 10 | [Linguix](https://openaitools.app/tool/linguix) | 227,398 | -4.5% | Freemium | Offers similar inline grammar correction and snippets, but with a smaller ecosystem of browser extensions and integrations. | [.md](https://openaitools.app/tool/linguix.md) |

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Source: https://openaitools.app/compare/grammarly-vs-writeabookai

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