Grammarly vs QuillBot: Which One for Your English Writing, and What About Arabic?

Pick by how you write. Choose Grammarly if you require an always-on English proofreader integrated directly into your operating systems, desktop applications, web browsers, and mobile keyboards to catch spelling and grammatical mistakes in real time as you compose; choose QuillBot if you need a rephrasing, summarization, and translation toolkit that restructures existing sentences and can translate entire documents between Arabic and English. For bilingual writers and professionals across the Gulf and wider MENA region, one fact should guide the decision: neither tool checks Arabic grammar. Both are writing assistants for English and a set of other languages that does not include Arabic, meaning bilingual authors producing Arabic correspondence must maintain a separate, dedicated Arabic writing tool such as Qalam alongside either service.

Always-On Correction Across Daily Applications: Grammarly as a Background Safety Net

Grammarly’s main practical advantage lies in its broad system-level integration. Rather than functioning solely as an external web destination where text must be copied and pasted, Grammarly embeds its error-detection tools directly across your working environment. Supported platforms include dedicated desktop applications for Windows and Mac, browser extensions spanning Chrome, Safari, Firefox, and Edge, native integrations inside Microsoft Office and Google Docs, and mobile keyboard applications for Android, iPhone, and iPad, allowing the software to operate quietly across daily writing tasks.

For workplace communicators, this always-on posture catches mechanical slips before text is finalized. Whether compiling documents in Google Docs or writing across Microsoft Office applications, Grammarly flags spelling errors and grammar slips as words are typed. The free version provides basic spelling and grammar corrections under the vendor promise to help users “Write without spelling and grammar mistakes”, alongside an allocation of 100 AI prompts per month. The free tier also shows your tone, but it cannot adjust it.

Upgrading to Grammarly Pro unlocks full-sentence rewrites with a click, tone adjustments, and guidance to “Write fluently in English”. Pro subscribers also receive unlimited personalized suggestions, citation consistency checks, 2,000 AI prompts per member per month, 1 style guide, and 1 brand tone setting. For professionals assembling career materials according to an AI CV writing guide or drafting corporate proposals, this deep integration helps prevent typographical oversights across core workflow tools.

QuillBot presents a distinctly different platform profile. While it provides browser extensions for Chrome and Edge, a macOS desktop application, a Microsoft Word add-in, and mobile apps and keyboards for Android and iOS, it did not list a Google Docs add-on on the premium platform roster checked on 2026-10-30. QuillBot functions primarily as an active destination interface where writers paste drafts to be rewritten, rather than a background monitor watching every keystroke across your computer.

Sentence Restructuring and Multilingual Drafts: QuillBot as a Paraphrasing and Translation Toolkit

While Grammarly focuses on real-time mechanical accuracy, QuillBot approaches writing as a text-transformation exercise, restructuring syntax, adjusting sentence variety, and swapping vocabulary to alter tone or density.

On its free tier, QuillBot restricts paraphrasing to 100 words at a time across two modes: Standard and Fluency. The free tier also includes basic grammar fixes, a summarizer capable of condensing up to 1,200 words, a humanizer tool limited to 100 words, and limited access to an AI content detector. Crucially, free users cannot adjust the synonym slider to control vocabulary variance, and no plagiarism checker is provided.

Subscribing to QuillBot Premium removes the 100-word ceiling, providing unlimited paraphrasing volume, 9 built-in modes alongside custom modes, full access to the synonym slider, an expanded summarizer ceiling of 6,000 words, and advanced grammar recommendations. This allows writers to reshape complex academic or business prose to match specific tonal registers.

The decisive feature for cross-language workflows is QuillBot’s translation tool, which supports 52 languages and dialects. Most notably, two-way translation between Arabic and English is confirmed, allowing users to “Translate entire documents from English to Arabic or from Arabic to English”. Free accounts can process up to 5,000 characters per translation, while Premium accounts receive unlimited translation capacity. Integrated synonym support within the translator is restricted to English, Spanish, French, German, and Portuguese. Writers managing multilingual workflows frequently examine how this compares with services like DeepL or follow our structured document translation guide.

Subscription Pricing and Commercial Value: Comparing Rates and Quotas

Subscription pricing and billing details differ substantially between the two platforms based on data checked on 2026-10-30:

• QuillBot Premium Pricing: The vendor displayed an annual subscription rate equivalent to $8.33 USD per month, advertising a “Pay annually 58% off” discount. A standalone monthly billing rate was not shown on the version of the premium page loaded on that date.
• Grammarly Pro Pricing: The vendor displayed a price of €12 in euros when accessed from a European server on 2026-10-30, with no monthly or annual breakdown visible on the loaded version. Grammarly displays prices in local currency, requiring readers to verify pricing within their own region. Grammarly promotes a free trial advertising “€0 payment today” with an email reminder sent 2 days before the trial ends, but the exact duration of the trial period is not stated.
• Enterprise Provisioning: Grammarly sells its enterprise plans through Superhuman Go.

Feature allowances and limits also diverge across both platforms:

• Plagiarism Checking Quotas: QuillBot Premium includes a plagiarism allowance of 25,000 words per month, while its free tier offers no plagiarism checking. Grammarly Pro bundles plagiarism detection and AI-generated-text detection, and the Grammarly plans page we loaded showed no word cap, whereas its free tier excludes both detection features entirely.
• AI Generation Allocations: Grammarly Free grants 100 AI prompts per month, expanding to 2,000 AI prompts per member per month on Pro, alongside 1 style guide and 1 brand tone.
• AI Content Detection: QuillBot provides an AI detector on both free and premium tiers with limited output on free, advertising multilingual support but omitting a list of supported languages. Grammarly confines AI-text detection entirely to its paid Pro tier.

The Bilingual Arabic-English Reality: The Missing Arabic Grammar Engine

A widespread assumption among bilingual professionals in the Gulf and wider MENA region is that international AI writing platforms provide comprehensive proofreading in Arabic alongside English. Verified vendor documentation confirms that this assumption is incorrect: neither Grammarly nor QuillBot checks Arabic grammar.

Grammarly provides red-underline writing support for spelling and grammar across 23 languages: English, Spanish, French, German, Portuguese, Italian, Turkish, Polish, Dutch, Czech, Vietnamese, Hungarian, Swedish, Romanian, Indonesian, Slovak, Danish, Finnish, Norwegian, Ukrainian, Korean, Tagalog, and Hindi. Arabic is not on the list. Advanced clarity suggestions, tone adjustments, and paragraph rewrites are restricted to only 6 languages: English, Spanish, French, German, Portuguese, and Italian, with the paraphrasing tool limited to the same six languages. While Grammarly advertises in-line translation into 19 different languages on its languages page, it provides no language roster, meaning Arabic translation support could not be confirmed.

QuillBot exhibits a similar absence of Arabic proofreading. Its grammar checker supports only 7 language varieties: English, German, French, Spanish, Brazilian Portuguese, Swiss German, and Dutch. Arabic grammar checking is completely unavailable. In its paraphrasing module, the premium page states that it can “Paraphrase in 23 languages” while the paraphrasing tool page states “20+ different languages”; however, neither page publishes a list of those languages, leaving Arabic paraphrasing unconfirmed.

For an Arabic-speaking author, both platforms function strictly as tools for English (or French) writing. Neither system catches grammatical errors, case ending mistakes, or typographical slips in Arabic text. For Arabic writing, our platform lists Qalam, an Arabic-first writing tool for Modern Standard Arabic with diacritization (tashkeel), no dialect support, and a 2,500-word free trial.

Consequently, an effective workflow requires dividing responsibilities: use QuillBot for translating drafts between Arabic and English (or consult specialized services like DeepL via our document translation guide), rely on Grammarly for background English proofreading across workplace applications, and use Qalam for Arabic writing.

A Practical Evaluation Test You Can Run in Five Steps

To determine which tool accommodates your personal writing workflow without purchasing a paid subscription, you can execute this practical, hands-on test using your own writing samples:

1. Select a representative sample paragraph: Extract a paragraph of roughly 80 to 90 words from an authentic professional or academic draft. For bilingual Arabic speakers, an ideal sample is a cover letter or introductory email containing typical linguistic sticking points, such as omitted articles (“a”, “an”, “the”), awkward preposition pairings, or lengthy run-on sentences. If you are drafting job application materials, review our AI CV writing guide to benchmark standard phrasing.
2. Run the sample through Grammarly Free: Open the free tool at Grammarly and paste your draft. Observe whether its basic spelling and grammar engine identifies missing articles, subject-verb disagreements, or punctuation errors under its stated promise to help users “Write without spelling and grammar mistakes”. Note that the free tier displays your detected tone but locks full-sentence rewrites and fluency suggestions behind the Pro tier.
3. Run the identical sample through QuillBot Free: Paste the exact same paragraph into the free paraphraser at QuillBot, keeping the text within the 100-word free limit. Inspect its basic grammar fixes, and then test both the Standard and Fluency paraphrasing modes to observe how the tool restructures your sentences.
4. Compare mechanical catches against stylistic rewrites: Count the specific errors caught by each free tier. Did Grammarly identify article omissions in context without modifying the surrounding meaning? Did QuillBot’s paraphraser rewrite run-on sentences effectively, or did its automated synonym choices introduce awkward phrasing because the synonym slider is locked on the free tier?
5. Test Arabic input and translation capabilities: Paste an Arabic paragraph into QuillBot’s paraphraser to verify directly whether Arabic text is processed, since Arabic paraphrasing remains unconfirmed in vendor documentation. Then, test translation in QuillBot between Arabic and English within the 5,000-character free limit, comparing the results against dedicated translation tools like DeepL and our document translation guide.

About this comparison

To preserve editorial rigor and factual accuracy, this comparison is grounded exclusively in verified features, published pricing, and platform documentation recorded on 2026-10-30. Several specific technical and operational areas were not measured in this evaluation:

• Accuracy on standardized benchmarks: Neither platform was subjected to controlled error-correction benchmarks or academic linguistic scoring tests.
• AI-detector accuracy: The detection sensitivity, false-positive rates, and evasion vulnerability of the AI content detectors were not measured.
• Plagiarism database size: The comparative search depth, web-crawling index scale, and academic repository coverage of the respective plagiarism engines were not measured.
• Privacy and data handling: Corporate data retention terms, telemetry collection, opt-out mechanisms for model training, and regulatory compliance policies were not evaluated.
• Grammarly translation into Arabic: While Grammarly advertises in-line translation into 19 languages on the Grammarly Languages page, the vendor does not publish the language list, meaning Arabic translation support could not be confirmed or tested.
• QuillBot paraphraser in Arabic: Because QuillBot omits language directories on both its premium and paraphrasing tool pages, Arabic paraphrasing support remains unconfirmed and was not tested.
• Enterprise and Team plans: Custom institutional agreements, multi-seat team administrative features, and enterprise deployments managed through Superhuman Go were not evaluated.