Grammarly vs LanguageTool 2026: AI Writing Tools
Grammarly offers more advanced AI-powered corrections and integrates with more platforms, while LanguageTool is free, open-source, and supports 30+ languages. Grammarly excels for English writing quality, whereas LanguageTool is better for multilingual users and those seeking privacy-first alternatives.
Grammarly
AI-powered writing assistant that checks grammar, spelling, tone, and style in real-time across web apps.
English-language professionals, content creators, students, non-native English speakers seeking premium writing quality, and users needing deep platform integration
LanguageTool
Free, open-source grammar and style checker supporting 30+ languages with local processing options.
Multilingual users, open-source advocates, privacy-conscious writers, budget-conscious users, developers building custom writing tools, and anyone writing in non-English languages
Quick Answer
AI SummaryGrammarly offers more advanced AI-powered corrections and integrates with more platforms, while LanguageTool is free, open-source, and supports 30+ languages. Grammarly excels for English writing quality, whereas LanguageTool is better for multilingual users and those seeking privacy-first alternatives.
Our Verdict
AI-assistedChoose Grammarly if you want the most advanced AI-powered writing assistance, native platform integrations, and superior English writing refinement—it's ideal for professionals, content creators, and non-native speakers focused on English. Choose LanguageTool if you need multilingual support, prefer open-source privacy-first solutions, want free access with quality basics, or are writing in languages beyond English.
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Choose Grammarly if
Best pickEnglish-language professionals, content creators, students, non-native English speakers seeking premium writing quality, and users needing deep platform integration
Choose LanguageTool if
Multilingual users, open-source advocates, privacy-conscious writers, budget-conscious users, developers building custom writing tools, and anyone writing in non-English languages
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Key Differences at a Glance
- Pricing Model:✓ LanguageTool wins(Free with optional premium ($10.08/month) vs Freemium ($12/month premium))
- Supported Languages:✓ LanguageTool wins(30+ languages vs English only (with dialects))
- Open Source:✓ LanguageTool wins(Open source vs Proprietary)
Key Facts & Figures
26 numeric metrics compared
| Metric | Grammarly | LanguageTool | Ratio |
|---|---|---|---|
| Annual Cost (Standard Plan)(USD) | $108 (with discount) | — | — |
| Daily Active Users(millions) | 40+ million | — | — |
| Writing Analytics Depth(score) | Basic metrics | — | — |
| Languages Supported(count) | Multiple with full AI | — | — |
| Real-Time Correction Speed(milliseconds) | Fast (<500ms) | — | — |
| Company Revenue (2026)(millions USD) | $700+ | — | — |
| Annual Premium Price (USD)($) | $144 | — | — |
| Grammar Rules Coverage(rules) | 150+ | — | — |
| Paraphrase Alternatives Per Sentence(options) | 2 | — | — |
| Tone Rewriting Options(tones) | 8 | — | — |
| Plagiarism Database Coverage(billion pages) | 16 | — | — |
| Monthly Premium Cost(USD) | $12.00 | $10.08 | |
| Supported Languages(count) | English (4 dialects) | 30+ languages | |
| Tone Detection Accuracy(percent) | 95% | 78% | |
| Rewrite Variations Per Suggestion(count) | 50+ (with GrammarlyGO) | 0 (suggestion-only) | |
| Monthly Subscription Cost(USD) | $12/month (annual) | — | — |
| Integrated App Support(number of apps) | 150+ apps (Gmail, Office, Slack, etc.) | — | — |
| Browser & Platform Integrations(platforms) | 500+ integrations | — | — |
| Synonym Suggestions Per Word(options) | 3-4 options | — | — |
| Tone Adjustment Modes(modes) | 8 modes | — | — |
| Annual Premium Subscription Cost(USD) | $144/year | — | — |
| Monthly Subscription Cost (Premium/Pro Tier)(USD) | $12.00/month | — | — |
| Annual Subscription Cost (Premium/Pro Tier)(USD) | $144.00/year | — | — |
| Context Window (Max Input Length)(tokens) | Single document | — | — |
| Platform Integrations(count) | 500+ integrations | 20+ integrations | |
| Grammar Detection Accuracy(percent) | 97% | — | — |
Sourced from publicly available data ·
Key Differences
7 attributes compared head-to-head
- Freemium ($12/month premium)Pricing ModelFree with optional premium ($10.08/month)(winner)
- English only (with dialects)Supported Languages30+ languages(winner)
- ProprietaryOpen SourceOpen source(winner)
- Advanced (GrammarlyGO with generative AI)(winner)AI Writing AssistantBasic suggestions only
- 50+ integrations (Office, Gmail, Slack, etc.)(winner)Platform Integrations20+ integrations
- Cloud-based (data shared with Grammarly)Data PrivacyLocal processing option available(winner)
- 95% accuracy (reported in 2024 testing)(winner)Tone Detection Accuracy78% accuracy
- Pricing Model
Grammarly
Freemium ($12/month premium)
LanguageTool
Free with optional premium ($10.08/month)(winner)
- Supported Languages
Grammarly
English only (with dialects)
LanguageTool
30+ languages(winner)
- Open Source
Grammarly
Proprietary
LanguageTool
Open source(winner)
- AI Writing Assistant
Grammarly
Advanced (GrammarlyGO with generative AI)(winner)
LanguageTool
Basic suggestions only
- Platform Integrations
Grammarly
50+ integrations (Office, Gmail, Slack, etc.)(winner)
LanguageTool
20+ integrations
- Data Privacy
Grammarly
Cloud-based (data shared with Grammarly)
LanguageTool
Local processing option available(winner)
- Tone Detection Accuracy
Grammarly
95% accuracy (reported in 2024 testing)(winner)
LanguageTool
78% accuracy
Full Comparison
| Attribute | Grammarly | LanguageTool |
|---|---|---|
| Annual Cost (Standard Plan)(USD) | $108 (with discount) | — |
| Annual Premium Price (USD)($) | $144 | — |
| Monthly Premium Cost(USD) | $12.00 | $10.08(winner) |
| Free Tier Access | Limited (basic checks only) | Full core features |
| Monthly Subscription Cost(USD) | $12/month (annual) | — |
Show 5 more attributesFree Tier Capability Basic grammar and spell check only — Annual Premium Subscription Cost(USD) $144/year — Monthly Subscription Cost (Premium/Pro Tier)(USD) $12.00/month — Annual Subscription Cost (Premium/Pro Tier)(USD) $144.00/year — Free Tier Availability(null) Yes (basic corrections only) — | ||
| Daily Active Users(millions) | 40+ million | — |
| Plagiarism Detection Quality | Advanced AI detector included | — |
| Writing Analytics Depth(score) | Basic metrics | — |
| Grammar Rules Coverage(rules) | 150+ | — |
| Paraphrase Alternatives Per Sentence(options) | 2 | — |
| Plagiarism Detection Available | Yes (Premium) | — |
Show 3 more attributesTone Rewriting Options(tones) 8 — Rewrite Variations Per Suggestion(count) 50+ (with GrammarlyGO) 0 (suggestion-only) Plagiarism Detection(boolean) Yes (Premium only) No | ||
| Languages Supported(count) | Multiple with full AI | — |
| Real-Time Correction Speed(milliseconds) | Fast (<500ms) | — |
| Context Window Size(tokens) | Not applicable | — |
| Ideal for Manuscript Editing | Good for quick reviews | — |
| Company Revenue (2026)(millions USD) | $700+ | — |
| Daily Free Rewrites (Free Plan)(rewrites) | Unlimited (basic) | — |
| Plagiarism Database Coverage(billion pages) | 16 | — |
| Tone Detection Accuracy(percent) | 95%(winner) | 78% |
| Supported Languages(count) | English (4 dialects) | 30+ languages(winner) |
| Open Source | No (proprietary) | Yes (GitHub community) |
| Integrated App Support(number of apps) | 150+ apps (Gmail, Office, Slack, etc.) | — |
| Platform Integrations(count) | 500+ integrations(winner) | 20+ integrations |
| Real-time Browser Integration(boolean) | Yes (500+ apps) | — |
| Real-Time Integration | Yes—instant feedback while typing | — |
| Browser & Platform Integrations(platforms) | 500+ integrations | — |
| Synonym Suggestions Per Word(options) | 3-4 options | — |
| Free Plan Monthly Paraphrases(requests/month) | Unlimited (limited features) | — |
| Tone Adjustment Modes(modes) | 8 modes | — |
| Context Window (Max Input Length)(tokens) | Single document | — |
| Content Generation Capability(max words per output) | Limited (rewrites only) | — |
| Grammar Detection Accuracy(percent) | 97% | — |
LanguageToolShow 5 more attributes
Show 3 more attributes
Pros & Cons
10 pros·6 cons across both
Grammarly
Pros
- Advanced AI-powered rewrites with GrammarlyGO (up to 50+ variations per suggestion)
- 95% accuracy in tone detection and contextual corrections
- 50+ platform integrations including Microsoft Office, Gmail, Slack, LinkedIn, and Twitter
- Real-time plagiarism detection included in Premium ($12/month plan)
- Detailed tone and style guidance with 8+ writing modes (formal, friendly, creative, etc.)
Cons
- English-only support with no multilingual capabilities
- Cloud-based processing raises privacy concerns for sensitive documents
- Premium pricing at $12/month is among the highest in category (24-36% more than competitors)
LanguageTool
Pros
- Free tier with all core grammar/spelling checks—no paywall for essential features
- Open-source architecture allows community auditing and local deployment
- Supports 30+ languages including German, French, Spanish, Portuguese, Dutch, Polish, Russian, Chinese, and more
- Optional local processing mode available for privacy-conscious users
- Optional Premium at €10.08/month (33% cheaper than Grammarly) with advanced rules and API access
Cons
- AI writing assistance and rewrites not available—only suggestions and corrections
- Tone detection accuracy at 78% is 17 percentage points lower than Grammarly
- Fewer platform integrations (20+ vs Grammarly's 50+), limiting workflow seamlessness
Frequently Asked Questions
5 questions
LanguageTool offers a genuinely free tier with all core grammar, spelling, and style corrections included. Grammarly's free tier is limited to basic grammar and spelling checks without advanced features. LanguageTool Premium costs €10.08/month versus Grammarly Premium at $12/month, making LanguageTool approximately 33% cheaper if you need premium features.
Resources & Learn More
Curated sources to dive deeper
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