Grammarly vs LanguageTool 2026: AI vs Affordable
Grammarly offers superior AI-powered writing suggestions and integrates across more platforms, while LanguageTool provides a more affordable, open-source alternative with strong grammar checking for 30+ languages. Grammarly excels for professional writing and native English speakers, whereas LanguageTool better serves budget-conscious users and non-English language learners.
Grammarly
AI-powered writing assistant with advanced tone detection and plagiarism checking for professional content.
Professional writers, students, business professionals, and non-native English speakers seeking premium writing refinement
LanguageTool
Open-source grammar checker supporting 30+ languages with an affordable freemium model.
Budget-conscious users, multilingual writers, students learning languages, and those valuing open-source transparency
Quick Answer
AI SummaryGrammarly offers superior AI-powered writing suggestions and integrates across more platforms, while LanguageTool provides a more affordable, open-source alternative with strong grammar checking for 30+ languages. Grammarly excels for professional writing and native English speakers, whereas LanguageTool better serves budget-conscious users and non-English language learners.
Our Verdict
AI-assistedChoose Grammarly if you need advanced AI-driven writing refinement, plagiarism detection, and professional-grade tone analysis for English-only workflows. Choose LanguageTool if you prioritize affordability, multilingual support, or value open-source transparency over cutting-edge AI features.
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Choose Grammarly if
Best pickProfessional writers, students, business professionals, and non-native English speakers seeking premium writing refinement
Choose LanguageTool if
Budget-conscious users, multilingual writers, students learning languages, and those valuing open-source transparency
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Key Differences at a Glance
- Monthly Subscription Cost:✓ LanguageTool wins(Free with $8/month premium vs $12/month (annual))
- AI-Powered Suggestions:✓ Grammarly wins(Advanced generative AI with tone detection vs Rule-based with limited machine learning)
- Languages Supported:✓ LanguageTool wins(30+ languages including German, French, Spanish vs English only)
Key Facts & Figures
47 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 | — | — |
| 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% | — | — |
| Monthly Premium Cost(USD) | $11.67/month (annual billing) | $10.08 | |
| Active Users Globally(millions) | 50+ million | — | — |
| Tone Options for Rewriting(count) | 2 tones (basic free; more in premium) | — | — |
| Integrated Platform Support(integrations) | 500+ (Google Docs, Gmail, Word, Slack, LinkedIn) | — | — |
| Grammar & Spelling Error Detection(error types) | 250+ grammar, spelling, punctuation rules | — | — |
| Free Trial Duration(days) | 30 days full premium access | — | — |
| Monthly Cost (Premium)(USD) | $12/month | — | — |
| Annual Cost (Premium)(USD) | $144/year | — | — |
| Grammar Rules Covered(rules) | 400+ rules | — | — |
| Platform Integration(platforms) | 500,000+ websites/apps | — | — |
| Tone/Style Detection(styles) | 100+ writing styles | — | — |
| User Rating (Capterra 2025)(stars) | 4.7/5 | — | — |
| Annual Subscription Cost (Premium)(USD) | $144/year | — | — |
| App Integrations(count) | 500+ integrations | — | — |
| Paraphrasing Modes(modes) | 2 modes | — | — |
| App Store Rating(stars) | 4.7/5 (500K+ reviews) | — | — |
| Annual Subscription Cost(USD) | $144/year ($12/month annual plan) | $96/year ($8/month annual plan) | |
| Languages Supported(languages) | 1 (English only) | 30+ (including German, French, Spanish, Dutch) | |
| Plagiarism Detection Coverage(billion pages) | 16+ billion web pages indexed | Not available | — |
| Browser Extensions Supported(browsers) | 5 (Chrome, Safari, Edge, Firefox, Opera) | 4 (Chrome, Firefox, Safari, Edge) | |
| Third-Party App Integrations(apps) | 500+ integrations (Slack, Office, Gmail, LinkedIn) | 50+ integrations (browser and email clients primarily) | |
| Tone Detection Options(tones) | 100+ writing tones (formal, friendly, confident, etc.) | Limited style suggestions without tone classification | — |
Sourced from publicly available data ·
Key Differences
7 attributes compared head-to-head
- $12/month (annual)Monthly Subscription CostFree with $8/month premium(winner)
- Advanced generative AI with tone detection(winner)AI-Powered SuggestionsRule-based with limited machine learning
- English onlyLanguages Supported30+ languages including German, French, Spanish(winner)
- Chrome, Safari, Edge, Firefox (5 major browsers)(winner)Browser Extensions AvailableChrome, Firefox, Safari, Edge (4 major browsers)
- Closed-source proprietary technologyOpen Source & TransparentOpen-source codebase on GitHub(winner)
- Yes, with detailed readability analytics(winner)Real-Time Writing ScoreBasic score only
- Yes, checks against 16+ billion web pages(winner)Premium Feature: Plagiarism DetectionNo plagiarism checker available
- Monthly Subscription Cost
Grammarly
$12/month (annual)
LanguageTool
Free with $8/month premium(winner)
- AI-Powered Suggestions
Grammarly
Advanced generative AI with tone detection(winner)
LanguageTool
Rule-based with limited machine learning
- Languages Supported
Grammarly
English only
LanguageTool
30+ languages including German, French, Spanish(winner)
- Browser Extensions Available
Grammarly
Chrome, Safari, Edge, Firefox (5 major browsers)(winner)
LanguageTool
Chrome, Firefox, Safari, Edge (4 major browsers)
- Open Source & Transparent
Grammarly
Closed-source proprietary technology
LanguageTool
Open-source codebase on GitHub(winner)
- Real-Time Writing Score
Grammarly
Yes, with detailed readability analytics(winner)
LanguageTool
Basic score only
- Premium Feature: Plagiarism Detection
Grammarly
Yes, checks against 16+ billion web pages(winner)
LanguageTool
No plagiarism checker available
Full Comparison
| Attribute | Grammarly | LanguageTool |
|---|---|---|
| Annual Cost (Standard Plan)(USD) | $108 (with discount) | — |
| Annual Premium Price (USD)($) | $144 | — |
| Free Tier Access | Limited (basic checks only) | Full core features |
| Monthly Subscription Cost(USD) | $12/month (annual) | — |
| Free Tier Capability | Basic grammar and spell check only | — |
Show 9 more attributesAnnual 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 — Monthly Premium Cost(USD) $11.67/month (annual billing) $10.08 Monthly Cost (Premium)(USD) $12/month — Annual Cost (Premium)(USD) $144/year — Annual Subscription Cost (Premium)(USD) $144/year — Annual Subscription Cost(USD) $144/year ($12/month annual plan) $96/year ($8/month annual plan) Free Tier Availability Limited (basic grammar only, heavily restricted) Comprehensive (full grammar, spelling, style checking) | ||
| Daily Active Users(millions) | 40+ million | — |
| Active Users Globally(millions) | 50+ 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 15 more attributesTone Rewriting Options(tones) 8 — Rewrite Variations Per Suggestion(count) 50+ (with GrammarlyGO) 0 (suggestion-only) Platform Integrations(count) 500+ integrations 20+ integrations Free Daily Rewrite Limit(rewrites/day) Unlimited suggestions — Tone Options for Rewriting(count) 2 tones (basic free; more in premium) — Grammar Rules Covered(rules) 400+ rules — Tone/Style Detection(styles) 100+ writing styles — App Integrations(count) 500+ integrations — Paraphrasing Modes(modes) 2 modes — Plagiarism Detection(available) Yes (Premium only) No Free Plan Grammar Checks(available) Yes — AI Content Generation (Co-Author/GrammarlyGO)(included) Separate subscription ($30/month) — Languages Supported(languages) 1 (English only) 30+ (including German, French, Spanish, Dutch) Plagiarism Detection Coverage(billion pages) 16+ billion web pages indexed Not available Tone Detection Options(tones) 100+ writing tones (formal, friendly, confident, etc.) Limited style suggestions without tone classification | ||
| Languages Supported(count) | Multiple with full AI | — |
| Supported Languages(count) | English (4 dialects) | 30+ languages(winner) |
| Real-Time Correction Speed(milliseconds) | Fast (<500ms) | — |
| 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% |
| Open Source | No (proprietary closed-source) | Yes (open-source on GitHub) |
| Integrated App Support(number of apps) | 150+ apps (Gmail, Office, Slack, etc.) | — |
| Real-time Browser Integration(boolean) | Yes (500+ apps) | — |
| Browser Extensions Supported(browsers) | 5 (Chrome, Safari, Edge, Firefox, Opera)(winner) | 4 (Chrome, Firefox, Safari, Edge) |
| Third-Party App Integrations(apps) | 500+ integrations (Slack, Office, Gmail, LinkedIn)(winner) | 50+ integrations (browser and email clients primarily) |
| Context Window Size(tokens) | Not applicable | — |
| 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% | — |
| Grammar & Spelling Error Detection(error types) | 250+ grammar, spelling, punctuation rules | — |
| Integrated Platform Support(integrations) | 500+ (Google Docs, Gmail, Word, Slack, LinkedIn) | — |
| Platform Integration(platforms) | 500,000+ websites/apps | — |
| Free Trial Duration(days) | 30 days full premium access | — |
| User Rating (Capterra 2025)(stars) | 4.7/5 | — |
| Learning Curve Complexity(1-5 scale) | 3/5 (moderate) | — |
| Monthly Active Users(millions) | 90M+ users | — |
| App Store Rating(stars) | 4.7/5 (500K+ reviews) | — |
LanguageToolShow 9 more attributes
Show 15 more attributes
Pros & Cons
10 pros·6 cons across both
Grammarly
Pros
- Advanced generative AI suggestions for style, clarity, and tone optimization
- Plagiarism detection scanning 16+ billion web pages for originality verification
- Real-time readability score with detailed analytics and performance metrics
- Tone detection identifies 100+ writing tones (confident, friendly, formal, casual)
- Seamless integration with 500+ apps including Slack, Microsoft Office, Gmail, and LinkedIn
Cons
- Expensive at $12/month annual or $30/month monthly — significantly higher than competitors
- English-only support; no multilingual capabilities for non-English writers
- Closed-source proprietary technology raises privacy concerns about data usage
LanguageTool
Pros
- Free tier with comprehensive grammar, spelling, and style checking at zero cost
- Open-source GitHub repository enables community audits and transparent development
- Supports 30+ languages including German, French, Spanish, Portuguese, Dutch, and Polish
- Affordable premium at $8/month or $60/year — 33% cheaper than Grammarly annual
- Browser, desktop, and mobile app support across all major platforms
Cons
- Rule-based detection lacks AI sophistication; misses nuanced style improvements that generative AI catches
- No plagiarism detection or originality checking features
- Smaller integration ecosystem — fewer third-party app connections compared to Grammaly
Frequently Asked Questions
5 questions
Both offer free versions. Grammarly's free tier is heavily limited, providing basic grammar and spelling checks only. LanguageTool's free tier is comprehensive, including grammar, spelling, and style checking with no restrictions. However, both offer premium subscriptions ($12/month for Grammarly, $8/month for LanguageTool) for advanced features.
Resources & Learn More
Curated sources to dive deeper
Where to Buy
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Wikipedia
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