GrammarlyGrammarly's algorithm analyses over 12 million documents daily to improve its detection accuracy.95.0NEWFree basic version, Premium from £10/month
ProWritingAidProWritingAid analyses 25+ writing metrics including readability index, sentence variety, and overused words.92.7NEW$120/year
Microsoft EditorMicrosoft Editor uses the same AI foundation as other Microsoft Copilot features for consistency across Office applications.90.3NEWFree (Premium $20/month with Microsoft 365)
Hemingway EditorHemingway Editor uses colour-coded feedback to visualise readability issues instantly, with a grade-level estimate.88.0NEW$19.99 (one-time desktop) or free web version
WhiteSmokeWhiteSmoke uses machine learning trained on millions of published texts to identify natural vs. awkward phrasing.85.7NEW$4.99/month (billed annually)
LanguageToolLanguageTool's code is open-source and available on GitHub, allowing community contributions and full transparency.83.3NEWFree (Premium $10/month)
Ginger SoftwareGinger's AI understands word context, allowing it to suggest corrections that make grammatical and semantic sense.81.0NEW$6.99/month
QuillbotQuillBot's paraphraser uses seven rewriting modes (standard, fluency, creative, formal, simple, expand, shorten) for varied output.78.7NEW$12/month
SaplingSapling's platform detects sensitive language and compliance issues in real time, helping teams maintain brand voice.76.3NEWCustom
WordtuneWordtune offers 1,000+ daily rewrites in the free tier, allowing users to explore multiple phrasing options.74.0NEWFree (Premium $14.99/month)
Grammarly uses machine learning to detect and correct grammar, spelling, punctuation, and style errors across web browsers, desktop, and mobile. It offers real-time suggestions, tone detection, and plagiarism checking in its premium tier.
ProWritingAid delivers detailed reports on grammar, style, readability, and pacing. It includes a comprehensive style guide, critiques repeated words and clichés, and offers learning resources for writers seeking to improve craft.
Microsoft Editor integrates directly into Word, Outlook, and the web to provide grammar, spelling, and clarity checks. Available free with basic features and premium for advanced suggestions, it leverages Microsoft's language AI models.
Hemingway Editor highlights sentences that are hard to read, overuse of adverbs and passive voice, and complex words. It emphasises simplicity and directness, making it ideal for writers targeting readability and public communication.
WhiteSmoke provides grammar, spelling, and style checking with an emphasis on naturalness and tone. It includes templates, plagiarism detection, and translation features, targeting both personal and professional writers.
LanguageTool is a free, community-driven grammar and style checker supporting multiple languages. It detects errors missed by other tools and offers premium features for advanced checking, including AI-powered suggestions.
Ginger Software uses machine translation and contextual analysis to correct grammar, spelling, and style errors. It includes a desktop application, browser extension, and keyboard integration, plus sentence rephrasing and translation tools.
QuillBot combines grammar checking with AI-powered paraphrasing, allowing writers to rephrase sentences while maintaining meaning. It supports tone adjustment and integrates with major web browsers and writing platforms.
Sapling specialises in real-time grammar, tone, and style correction for customer-facing communications. It integrates with CRM and messaging platforms, offering team collaboration features and compliance checking for regulated industries.
Wordtune uses machine learning to suggest sentence rewrites that improve clarity, tone, and impact. It focuses on helping users express their ideas more effectively, with options to adjust tone (formal, casual, confident) and brevity.
Free versions typically cover basic grammar, spelling, and punctuation. Paid tiers add advanced features like plagiarism detection, tone analysis, style recommendations, AI paraphrasing, and broader platform integrations. Premium plans also usually offer fewer usage limits and priority support.
Grammarly and Microsoft Editor integrate most seamlessly with Word; Grammarly additionally supports Google Docs via browser extension. QuillBot offers browser extensions for both, though integration depth varies. Microsoft Editor is native to Word and Microsoft 365 applications.
Most major tools (Grammarly, ProWritingAid, LanguageTool) comply with privacy standards, though users should review privacy policies. LanguageTool is open-source and privacy-focused. For extremely sensitive documents, desktop-only tools or on-premise solutions offer greater control over data.
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