Grammarly leads this ranking for general-purpose writing across all skill levels and contexts. For academic writing specifically, Turnitin excels with comprehensive plagiarism detection alongside grammar checks. Microsoft Editor offers excellent value for those already using Office products, providing enterprise-grade corrections with seamless integration.
RANKENTRYSCORETRENDFROM
1GrammarlyGrammarly processes over 70 million daily users and has been trained on billions of words of text95.0NEWFree tier available, Premium from £12/month 2Microsoft EditorEditor powers suggestions across the entire Microsoft 365 ecosystem with over 500 million Office users worldwide92.7NEWFree (Basic); Included with Microsoft 365 (£9.99/month) 3TurnitinTurnitin processes over 40 million submissions annually across more than 10,000 institutions90.3NEWCustom (institutional licensing) 4QuillbotQuillBot's paraphrasing engine can rephrase text in multiple styles and tones with seven distinct rewriting modes88.0NEWFree tier available 5ProWritingAidProWritingAid generates detailed visual reports analysing 40+ writing metrics for continuous improvement85.7NEW£9.99/month (Monthly); £79.99/year (Annual) 6Hemingway EditorHemingway Editor uses a visual, colour-coded system to instantly identify readability issues without complex explanations83.3NEWFree (Web); £19 (Desktop) 7LanguageToolLanguageTool is open-source and supports more than 30 languages with community-driven development81.0NEWFree (Basic); £5.08/month (Premium) 8Ginger SoftwareGinger Software offers offline grammar checking and is optimised for real-time corrections on mobile devices78.7NEWFree (Basic); £7.49/month (Premium) 9CopyscapeCopyscape scans over 2 billion web pages and maintains a database of previously scanned documents for plagiarism detection76.3NEW£0.04 per word or Custom plans 101Checker1Checker provides completely free grammar checking without limitations or premium tiers74.0NEWFree The ranking, in detail
01
Writing Assistant with Paraphrasing Suggestions
Grammarly uses advanced AI to detect and correct grammatical errors, spelling mistakes, punctuation issues, and style improvements. It offers real-time suggestions across web browsers, Microsoft Office, and native applications, with tone detection and plagiarism checking in premium tiers.
From Free tier available, Premium from £12/monthBest for Existing Grammarly users seeking integrated paraphrasing alongside grammar checking
95.0
02
Built-in AI writing assistance for Microsoft Office
Microsoft Editor is integrated into Word, Outlook, and web versions of Office applications, providing real-time grammar, spelling, and clarity suggestions. It includes advanced features like tone detection, formality adjustment, and inclusive language recommendations.
From Free (Basic); Included with Microsoft 365 (£9.99/month)Best for Microsoft Office users and enterprise organisations
92.7
03
Academic integrity and grammar checking platform
Turnitin combines AI-powered grammar and plagiarism detection specifically designed for educational institutions. It checks writing for errors whilst simultaneously comparing submissions against a massive database of academic sources and previous papers.
From Custom (institutional licensing)Best for Universities, educational institutions, and academic writers
90.3
04
AI-powered writing and paraphrasing tool with study note enhancement features
QuillBot specialises in paraphrasing and rewriting text whilst checking grammar. Its AI models help users rephrase sentences, adjust tone, and improve clarity. It integrates with popular browsers and offers both standalone web and desktop applications.
From Free tier availableBest for Students needing to rewrite, refine, and improve their existing notes and study materials
88.0
05
In-depth writing analytics and improvement tool
ProWritingAid provides comprehensive writing analysis with detailed reports on grammar, style, readability, and tone. It offers visual graphs tracking writing patterns and includes a library of writing guides. Integration with Word, Google Docs, and browsers is seamless.
From £9.99/month (Monthly); £79.99/year (Annual)Best for Professional writers, novelists, and those seeking detailed writing analytics
85.7
06
Clarity-focused writing assistant for simplifying prose
Hemingway Editor specialises in making prose clear and concise by highlighting overly complex sentences, passive voice, and adverbial usage. It uses a simple colour-coded system to identify areas for improvement and suggest shorter, punchier alternatives.
From Free (Web); £19 (Desktop)Best for Content creators and writers aiming for clarity and brevity
83.3
07
Open-source grammar checker supporting 30+ languages
LanguageTool is an open-source grammar and spell checker that supports over 30 languages. It detects errors in grammar, spelling, and style across web browsers, desktop applications, and Google Docs. The free version covers essential corrections; premium adds advanced checks.
From Free (Basic); £5.08/month (Premium)Best for Multilingual writers and those seeking budget-friendly grammar assistance
81.0
08
Mobile-first grammar and spell checking platform
Ginger Software is a grammar checker optimised for mobile devices and real-time text correction. It offers context-aware corrections for grammar, spelling, and punctuation across smartphones, tablets, and desktop browsers with offline support.
From Free (Basic); £7.49/month (Premium)Best for Mobile users and those requiring offline grammar checking
78.7
09
Plagiarism detection with basic grammar checking
Copyscape is primarily a plagiarism detection tool that compares documents against online sources and a proprietary database. Alongside its core plagiarism function, it offers basic grammar and readability checks to ensure both originality and quality.
From £0.04 per word or Custom plansBest for Content creators and publishers concerned with plagiarism alongside quality
76.3
10
Free cloud-based grammar and spell checking
1Checker is a free cloud-based grammar checker offering real-time corrections for spelling, grammar, and punctuation across web browsers and desktop. It supports browser extensions and integrates with email and document platforms for convenient on-the-go checking.
From FreeBest for Budget-conscious users seeking basic grammar checking without premium features
74.0
Frequently asked questions
What is the difference between free and paid grammar checking tools?
Free tools typically offer basic grammar, spelling, and punctuation checks. Paid versions add advanced features such as plagiarism detection, tone analysis, readability scoring, detailed reports, and broader stylistic suggestions. Premium tools also integrate more seamlessly across platforms and update more frequently with improved AI models.
Can AI grammar checkers replace human proofreading?
AI grammar checkers catch the majority of errors and improve clarity significantly, but they cannot fully replace human proofreading. They occasionally miss context-specific errors, may flag correct non-standard usage, and lack an editor's understanding of intent. They work best as a first-pass tool before human review, particularly for high-stakes writing.
Which grammar checker is best for academic writing?
Turnitin is purpose-built for academic institutions with comprehensive plagiarism detection alongside grammar checks. For individual students, Grammarly Premium offers excellent academic writing support with citation tools and plagiarism detection. ProWritingAid also suits academic writers seeking detailed analysis of style and argumentation.