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Quick Answer
Grammarly is the gold standard for grammar checking, but it’s not the only option. QuillBot (~£3.33/month) is the cheapest capable alternative with strong paraphrasing. ProWritingAid ($10/month) is the most comprehensive for long-form writers — style analysis, pacing reports, and writing improvement tools that go beyond error-catching. ChatGPT and Claude ($20/month each) offer AI writing assistance that includes grammar correction plus content generation. The right alternative depends on whether you need pure error-catching or broader writing assistance.
The 5 Best Grammarly Alternatives
1. QuillBot — Best Budget Alternative
QuillBot Premium at approximately £3.33/month (annual billing) is the cheapest writing assistant worth considering. The grammar checker is competent (though not as thorough as Grammarly’s), and the paraphrasing tool with 10 modes is uniquely powerful for rewording existing text. For budget-conscious writers who primarily need paraphrasing plus basic error-catching, QuillBot delivers excellent value.
Score: 71/100 | Price: Free / ~£3.33/mo (annual)
2. ProWritingAid — Best for Long-Form Writers
ProWritingAid goes deeper than Grammarly on writing analysis — readability scores, sentence length variation, pacing reports, overused word detection, and style-specific suggestions. For novelists, academic writers, and long-form content producers, ProWritingAid’s analytical depth exceeds Grammarly’s. The grammar checking is solid but Grammarly still edges ahead on raw error detection accuracy.
Price: $10/mo / $80/yr (Premium)
3. LanguageTool — Best Privacy-Focused Alternative
LanguageTool is the open-source-based grammar checker with a strong privacy stance — it offers an on-premise version for organisations that can’t send text to cloud servers. The free tier supports 10,000 characters per check. Premium (from $4.99/month) adds advanced style suggestions and longer text limits. Grammar accuracy is good but doesn’t match Grammarly’s depth.
Price: Free (10,000 chars) / from $4.99/mo
4. ChatGPT Plus — Best for Writing + Generation
ChatGPT Plus ($20/month) catches grammar errors and generates content — a broader capability set than Grammarly’s editing focus. Paste text and ask ChatGPT to “fix grammar and improve clarity” and it returns a corrected version with explanations. The tradeoff is workflow: Grammarly works inline everywhere via browser extension; ChatGPT requires copy-pasting to a separate interface.
Score: 85/100 | Price: Free / $20/mo
5. Claude — Best for Quality Rewriting
Claude ($20/month Pro) produces the most natural rewriting of any AI tool. Ask it to improve a paragraph and the result reads like a polished human edit, not a machine rewrite. For writers who want their text improved without losing their voice, Claude’s rewriting is the best available. Like ChatGPT, the limitation is workflow — no inline browser extension.
Score: 86/100 | Price: Free / $20/mo
How to Choose
On a tight budget: QuillBot (~£3.33/month) — cheapest capable option.
Write long-form content: ProWritingAid ($10/month) — deeper writing analysis than Grammarly.
Need privacy/on-premise: LanguageTool — open-source-based, on-premise available.
Want AI writing + error-catching: ChatGPT or Claude ($20/month) — broader capability but no inline integration.
Want the best grammar checking available: Stay with Grammarly. None of these alternatives match its 93-98% accuracy and seamless cross-platform integration. The alternatives win on price, specialist features, or breadth — not on grammar checking itself.
FAQ
Is Grammarly still worth paying for? For users who write across multiple platforms daily and value inline, automatic error-catching, yes. Grammarly’s browser extension works everywhere without workflow disruption — no alternative matches this convenience.
Can ChatGPT replace Grammarly? For grammar checking specifically, ChatGPT is capable but less convenient. You need to paste text manually rather than getting inline suggestions. For users who primarily use ChatGPT for writing anyway, it can reduce the need for a separate grammar tool.
What’s the best free Grammarly alternative? LanguageTool offers the best free grammar checking (10,000 characters per check). QuillBot’s free tier provides basic grammar plus limited paraphrasing.
Last updated: April 2026