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Grammarly vs Claude 2026: Which AI Writing Tool Wins

Grammarly is a writing assistant focused on grammar, spelling, and style corrections, while Claude is a general-purpose AI chatbot designed for conversation, analysis, and content creation. Grammarly integrates into your writing tools, whereas Claude operates as a standalone conversational platform.

G

Grammarly

AI-powered writing assistant with 400+ grammar rules, plagiarism detection, and tone analysis.

Professionals, students, and casual writers who want passive grammar checking integrated into their existing tools without learning a new interface.

Score63%
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VS
C

Claude

Anthropic's AI assistant emphasizing safety, accuracy, and long-context reasoning with reduced hallucinations.

Knowledge workers, developers, researchers, and content creators who need AI for research, writing from scratch, coding assistance, and complex analysis rather than passive correction.

Score56%
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Quick Answer

AI Summary

Grammarly is a writing assistant focused on grammar, spelling, and style corrections, while Claude is a general-purpose AI chatbot designed for conversation, analysis, and content creation. Grammarly integrates into your writing tools, whereas Claude operates as a standalone conversational platform.

Our Verdict

AI-assisted

Choose Grammarly if you want passive, always-on writing corrections integrated into your existing workflows and email. Choose Claude if you need a versatile AI assistant for creative writing, problem-solving, analysis, coding help, and long-form content generation. They serve different needs: Grammarly perfects what you write, Claude helps you write from scratch.

Community feedback

Was this verdict helpful?

G
Grammarly
8.8/10
Claude
6.3/10
C
G

Choose Grammarly if

Best pick

Professionals, students, and casual writers who want passive grammar checking integrated into their existing tools without learning a new interface.

C

Choose Claude if

Knowledge workers, developers, researchers, and content creators who need AI for research, writing from scratch, coding assistance, and complex analysis rather than passive correction.

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Key Differences at a Glance

  • Primary Function:Grammar and style corrections in real-time vs Conversational AI for multiple tasks
  • Integration Capability:✓ Grammarly wins(Works within email, docs, browsers (150+ apps) vs Web interface and API only)
  • Reasoning and Analysis:✓ Claude wins(Advanced reasoning across topics vs Limited to writing suggestions)
See all 7 differences

Key Facts & Figures

79 numeric metrics compared

MetricGrammarlyClaudeRatio
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——
Supported Languages(count)English (4 dialects)——
Tone Detection Accuracy(percent)95%——
Rewrite Variations Per Suggestion(count)50+ (with GrammarlyGO)——
Monthly Subscription Cost(USD)$12/month (annual)$20/month
Integrated App Support(number of apps)150+ apps (Gmail, Office, Slack, etc.)Web interface + API only
Context Window Size(tokens)Not applicable200,000 tokens—
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$20.00/month
Annual Subscription Cost (Premium/Pro Tier)(USD)$144.00/year$240.00/year
Context Window (Max Input Length)(tokens)Single document200,000 tokens
Platform Integrations(count)500+ integrationsAPI only (requires custom setup)
Grammar Detection Accuracy(percent)97%94%
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——
SWE-bench Verified Score(%)80.9%80.9%
Context Window (Paid Tier)(tokens)200,000200,000
Monthly Active Users(millions)ClaudeClaude
Developer Preference Rating(%)ClaudeClaude
Company Valuation(billions USD)ClaudeClaude
Context Window (Tokens)(tokens)200,000200,000
Input Cost per Million Tokens(USD)$8.00$8.00
Output Cost per Million Tokens(USD)$24.00$24.00
Average Response Latency(milliseconds)380380
Multimodal Format Support(formats)3 (text, image, PDF)3 (text, image, PDF)
Third-Party Integrations Available(integrations)2,000+2,000+
Reasoning Capability Rating(score (1-10))9.59.5
Context Window(tokens)200,000–1,000,000 tokens200,000–1,000,000 tokens
Coding Benchmark (Specialist)(%)92% accuracy92% accuracy
MMLU Reasoning Score(%)88.3%88.3%
Pro Subscription Cost(USD/month)$20/month$20/month
Context Window (Token Limit)(tokens)200,000 tokens200,000 tokens
Complex Reasoning Accuracy (AIME 2024)(percent)85%85%
Code Generation Accuracy (HumanEval)(%)92%92%
Subscription Cost (Primary Plan)(USD per month)$20/month (Claude Pro)$20/month (Claude Pro)
Code Generation Benchmark Score(%)92% (HumanEval)92% (HumanEval)
Monthly Cost (Individual User)(USD)$20 (Claude Pro)$20 (Claude Pro)
Maximum Response Time(seconds)2-6 seconds average2-6 seconds average
Document Summarization Effectiveness(%)89% user satisfaction89% user satisfaction
Monthly Cost (Subscription)(USD)$20$20
Code Completion Latency(milliseconds)500-2000ms (chat response)500-2000ms (chat response)
Number of Supported AI Models(models)Claude 3.5 Sonnet, Claude 3 Opus, Claude 3 HaikuClaude 3.5 Sonnet, Claude 3 Opus, Claude 3 Haiku
Estimated Daily Active Users(millions)~10 million (reported by Anthropic, 2024)~10 million (reported by Anthropic, 2024)
Max File Size for Analysis(megabytes)~10MB per upload (practical limit)~10MB per upload (practical limit)
Years Since Launch(years)2 years (launched March 2024)2 years (launched March 2024)
MMLU Benchmark Score(percent)94.4%94.4%
API Input Cost(USD per 1M tokens)$3 (Opus) / $0.80 (Haiku)$3 (Opus) / $0.80 (Haiku)
Hallucination Rate on Factual Tasks(percent)3-5%3-5%
Context Window (Maximum Tokens)(tokens)200,000 tokens200,000 tokens
Coding Task Accuracy (HumanEval Benchmark)(%)92.0%92.0%
Standalone Pricing (Monthly)(USD)$20 (Claude Pro)$20 (Claude Pro)
Code Generation Success Rate(percent)88% on HumanEval88% on HumanEval
Platform Integration Points(platforms)8+ (Web, Desktop, API, Slack, etc.)8+ (Web, Desktop, API, Slack, etc.)
Response Time for Complex Tasks(seconds)3-6 seconds average3-6 seconds average
Document Summarization Quality(satisfaction score)8.7/10 standalone8.7/10 standalone
Monthly Subscription (Pro/Standard)(USD)$20$20
Maximum File Upload Size(GB)0.02 GB (20MB per file)0.02 GB (20MB per file)
Monthly Subscription Price(USD)$20$20
User Reported Reasoning Quality (Scale 1-10)(score)9.1/109.1/10
Code Generation Accuracy(% on HumanEval)92%92%
Premium Subscription Cost(USD/month)$20/month (Pro)$20/month (Pro)

Sourced from publicly available data ·

Key Differences

7 attributes compared head-to-head

G
3Grammarly
Evenly matched1 tie
C
3Claude
  • Primary Function

    Grammarly

    Grammar and style corrections in real-time

    Claude

    Conversational AI for multiple tasks

  • Integration Capability

    Grammarly

    Works within email, docs, browsers (150+ apps)(winner)

    Claude

    Web interface and API only

  • Reasoning and Analysis

    Grammarly

    Limited to writing suggestions

    Claude

    Advanced reasoning across topics(winner)

  • Real-time Writing Feedback

    Grammarly

    Instant corrections as you type(winner)

    Claude

    Requires message submission

  • Content Generation Quality

    Grammarly

    Limited to rephrasing and tone adjustment

    Claude

    Creates long-form content from scratch(winner)

  • Free Tier Functionality

    Grammarly

    Basic grammar and spell check only

    Claude

    Full Claude 3.5 Sonnet access with rate limits(winner)

  • Monthly Subscription Cost

    Grammarly

    $12 (Premium, billed annually)(winner)

    Claude

    $20 (Claude Pro)

Full Comparison

GGrammarly
CClaude
Annual Cost (Standard Plan)(USD)
$108 (with discount)
—
Annual Premium Price (USD)($)
$144
—
Monthly Premium Cost(USD)
$12.00
—
Free Tier Access
Limited (basic checks only)
—
Monthly Subscription Cost(USD)
$12/month (annual)
$20/month
Show 22 more attributes
Free Tier Capability
Basic grammar and spell check only
Full Claude 3.5 Sonnet with usage limits
Annual Premium Subscription Cost(USD)
$144/year
—
Monthly Subscription Cost (Premium/Pro Tier)(USD)
$12.00/month
$20.00/month
Annual Subscription Cost (Premium/Pro Tier)(USD)
$144.00/year
$240.00/year
Free Tier Availability(text)
Yes (basic corrections only)
Yes (Claude 3 Haiku free)
Monthly Cost (Premium)(USD)
$12/month
—
Annual Cost (Premium)(USD)
$144/year
—
Input Cost per Million Tokens(USD)
$8.00
—
Output Cost per Million Tokens(USD)
$24.00
—
Free tier
Sonnet 4.6 (rate-limited)
—
Paid entry plan
Claude Pro $20/mo
—
Power-user tier
Max $100–$200/mo
—
Team plan
$30/user/mo
—
API input (per 1M tokens)
Sonnet 4.6: $3.00
—
Pro Subscription Cost(USD/month)
$20/month
—
Subscription Cost (Primary Plan)(USD per month)
$20/month (Claude Pro)
—
Monthly Cost (Individual User)(USD)
$20 (Claude Pro)
—
Monthly Cost (Subscription)(USD)
$20
—
API Input Cost(USD per 1M tokens)
$3 (Opus) / $0.80 (Haiku)
—
Monthly Subscription (Pro/Standard)(USD)
$20
—
Monthly Subscription Price(USD)
$20
—
Premium Subscription Cost(USD/month)
$20/month (Pro)
—
Daily Active Users(millions)
40+ million
—
Estimated Daily Active Users(millions)
~10 million (reported by Anthropic, 2024)
—
Monthly Active Users(billions)
5+ 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 attributes
Tone Rewriting Options(tones)
8
—
Rewrite Variations Per Suggestion(count)
50+ (with GrammarlyGO)
—
Plagiarism Detection
Yes, Premium feature
—
Grammar Rules Covered(rules)
400+ rules
—
Tone/Style Detection(styles)
100+ writing styles
—
Web Search
Yes (Feb 2026)
—
Multimodal Capabilities
Text and code focused
—
Google Workspace Integration(integration level)
2
—
Image Generation
No
—
Real-Time Web Search
No
—
Real-Time Information Access
No
—
Voice/Audio Capabilities
No
—
Real-Time Web Access
No (April 2024 cutoff)
—
Image Generation Capability
Limited (image analysis only)
—
Web Browsing Capability
No
—
Languages Supported(count)
Multiple with full AI
—
Supported Languages(count)
English (4 dialects)
—
Platform Availability(platforms)
Web, iOS, Android, API
—
Available on Mobile
iOS app available
—
Real-Time Correction Speed(milliseconds)
Fast (<500ms)
—
Execution Speed
Slower (more thorough)
—
Coding Benchmark (Specialist)(%)
92% accuracy
—
MMLU Reasoning Score(%)
88.3%
—
Code Generation Accuracy (HumanEval)(%)
92%
—
Show 10 more attributes
Code Generation Benchmark Score(%)
92% (HumanEval)
—
Maximum Response Time(seconds)
2-6 seconds average
—
Code Completion Latency(milliseconds)
500-2000ms (chat response)
—
MMLU Benchmark Score(percent)
94.4%
—
Coding Task Accuracy (HumanEval Benchmark)(%)
92.0%
—
Code Generation Success Rate(percent)
88% on HumanEval
—
Response Time for Complex Tasks(seconds)
3-6 seconds average
—
Code Completion Speed(seconds)
N/A (manual conversation only)
—
User Reported Reasoning Quality (Scale 1-10)(score)
9.1/10
—
Code Generation Accuracy(% on HumanEval)
92%
—
Ideal for Manuscript Editing
Good for quick reviews
—
Company Revenue (2026)(millions USD)
$700+
—
Company Valuation(billions USD)
Claude
—
Daily Free Rewrites (Free Plan)(rewrites)
Unlimited (basic)
—
Plagiarism Database Coverage(billion pages)
16
—
Tone Detection Accuracy(percent)
95%
—
Hallucination Rate on Factual Tasks(percent)
3-5%
—
Hallucination Rate(% on factual queries)
4-6%
—
Open Source
No (proprietary)
—
Integrated App Support(number of apps)
150+ apps (Gmail, Office, Slack, etc.)
Web interface + API only
Platform Integrations(count)
500+ integrations
API only (requires custom setup)
Real-time Browser Integration(boolean)
Yes (500+ apps)
No (manual input required)
Ecosystem Integration
Standalone platform
—
Windows OS Integration
Web browser only, no native integration
—
Show 2 more attributes
Microsoft 365 Integration
No integration, manual file uploads required
—
Office 365 Integration
Web-based only
—
Context Window Size(tokens)
Not applicable
200,000 tokens
Maximum File Upload Size(GB)
0.02 GB (20MB per file)
—
Real-Time Integration
Yes—instant feedback while typing
No—requires manual submission
Browser & Platform Integrations(platforms)
500+ integrations
—
Third-Party Integrations Available(integrations)
2,000+
—
Standalone Usage Capability(boolean)
Yes (fully independent)
—
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
200,000 tokens
Content Generation Capability(max words per output)
Limited (rewrites only)
Up to 150,000 words
Context Window(tokens)
200,000–1,000,000 tokens
—
Number of Supported AI Models(models)
Claude 3.5 Sonnet, Claude 3 Opus, Claude 3 Haiku
—
Max File Size for Analysis(megabytes)
~10MB per upload (practical limit)
—
Show 2 more attributes
Context Window (Maximum Tokens)(tokens)
200,000 tokens
—
Document Summarization Quality(satisfaction score)
8.7/10 standalone
—
Grammar Detection Accuracy(percent)
97%
94%
Platform Integration(platforms)
500,000+ websites/apps
—
Available Platforms(count)
5+ (Web, iOS, Android, API, third-party apps)
—
User Rating (Capterra 2025)(stars)
4.7/5
—
Learning Curve Complexity(1-5 scale)
3/5 (moderate)
—
Coding Blind Test Winner
Won coding tests
—
Long Document Handling
Superior
—
Context Window (Paid Tier)(tokens)
200,000
—
Context Window (Tokens)(tokens)
200,000
—
Multimodal Format Support(formats)
3 (text, image, PDF)
—
Reasoning Capability Rating(score (1-10))
9.5
—
Show 1 more attribute
Input Types Supported
Code, text, images, PDFs, documents
—
Market Adoption 2026
Growing adoption
—
SWE-bench Verified Score(%)
80.9%
—
Monthly Active Users(millions)
Claude
—
Developer Preference Rating(%)
Claude
—
Coding Task Excellence(benchmark)
Excellent (leading tool)
—
Reasoning Quality(benchmark)
Superior (Claude 4.6)
—
Content Writing Refinement
Nuanced and contextual
—
Average Response Latency(milliseconds)
380
—
Headline model
Sonnet 4.6, Opus 4.8
—
Coding (SWE-bench Verified)
#1 (Opus 4.8 + Claude Code)
—
Web grounding / citations
Via integrations / Computer Use
—
Multilingual quality
Strong (esp. European + Japanese)
—
Structured output / JSON mode
Strict tool use + JSON schemas
—
Show 1 more attribute
Training data cut-off
~2025
—
Image input
Yes
—
Voice mode
Limited (API-based)
—
Agentic capability
Claude Code + Computer Use
—
Plugin Ecosystem(available plugins)
MCP-based (growing)
—
Mobile app quality
iOS/Android, catching up
—
Prompt caching (API)
Explicit cache markers (5m / 1h)
—
Fine-tuning (API)
No public fine-tuning
—
On-prem / self-host
Cloud-only (Bedrock / Vertex)
—
API rate limits (Tier 1)
~50 RPM / 40K ITPM (Sonnet 4.6)
—
Context Window (Token Limit)(tokens)
200,000 tokens
—
Complex Reasoning Accuracy (AIME 2024)(percent)
85%
—
Knowledge Cutoff Date(month/year)
April 2024
—
Content Moderation Strictness(level)
Strict safety guidelines
—
Training Data Recency(months_old)
Static as of April 2024
—
Document Summarization Effectiveness(%)
89% user satisfaction
—
Years Since Launch(years)
2 years (launched March 2024)
—
Free Tier Model Quality(equivalent tier)
Claude 3.5 Haiku (capable)
—
Standalone Pricing (Monthly)(USD)
$20 (Claude Pro)
—
Platform Integration Points(platforms)
8+ (Web, Desktop, API, Slack, etc.)
—
Real-Time Collaboration Support(boolean)
Limited (Claude Teams requires separate setup)
—
IDE Integration
None (chat interface only)
—
Codebase Context Indexing
Manual context provision required
—
API Rate Limit (Standard Tier)(calls/hour)
Depends on API tier
—

Pros & Cons

10 pros·7 cons across both

G
C
G

Grammarly

+5-3

Pros

  • Real-time corrections as you type across 150+ integrated apps
  • Detailed explanations for every grammar rule violation
  • Tone detection with 8+ adjustable writing styles (professional, friendly, casual)
  • Native browser extension for Gmail, LinkedIn, Twitter, and web forms
  • Plagiarism detection included with Premium ($0.99/month additional)

Cons

  • Cannot generate original content or write from scratch
  • Free tier severely limited (basic grammar only, no advanced features)
  • Privacy concerns: stores writing data on Grammarly servers
C

Claude

+5-4

Pros

  • Advanced reasoning and multi-step problem solving across any topic
  • Generates long-form content from scratch (essays, stories, code)
  • Handles complex analysis and document summarization (200K+ token context window)
  • Free tier includes full Claude 3.5 Sonnet with usage limits
  • Superior coding capabilities with syntax understanding for 50+ programming languages

Cons

  • No real-time integration—requires switching to separate interface
  • No native grammar checking or writing style suggestions
  • Occasionally makes factual errors or 'hallucinations' on obscure topics
  • $20/month subscription for Claude Pro is steeper than Grammarly

Frequently Asked Questions

5 questions

  1. Yes, they complement each other perfectly. Use Claude for drafting content, research, and brainstorming, then use Grammarly to polish and correct the final output. Since Grammarly integrates into 150+ apps, you can run Grammarly on Claude's exported text within Gmail, Google Docs, or Notion.

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