Grammarly is a grammar and style checker focused on writing quality across all platforms, while Claude is an AI assistant designed for complex reasoning, content creation, and problem-solving conversations. They serve different primary purposes: Grammarly corrects and enhances existing writing, whereas Claude generates new content and provides analytical support.
Grammarly vs Claude — Side-by-side comparison on A Versus B
AI-powered writing assistant that checks grammar, spelling, tone, and style in real-time across web apps.
Advanced conversational AI assistant by Anthropic for reasoning, content generation, coding, and analysis.
Primary Function. Real-time Writing Corrections. Content Generation Capability. Context Window Length. Accuracy on Grammar Tasks. Free Tier Limitations. Integration Ecosystem
Choose Grammarly if you need real-time writing assistance, grammar correction, and polish across your existing workflows—it's purpose-built for professionals who write daily in Gmail, Word, or other platforms. Choose Claude if you need advanced AI reasoning, content generation from scratch, document analysis, coding help, or complex problem-solving that goes beyond grammar correction.
Grammarly: $108 (with discount) | Claude: N/A
Grammarly: Advanced AI detector included | Claude: N/A
Grammarly: Multiple with full AI | Claude: N/A
Grammarly: Good for quick reviews | Claude: N/A
Grammarly: Unlimited (basic) | Claude: N/A
Grammarly: English (4 dialects) | Claude: N/A
Grammarly: 50+ (with GrammarlyGO) | Claude: N/A
Grammarly: Limited (basic checks only) | Claude: N/A
Grammarly: No (proprietary) | Claude: N/A
Grammarly: Yes (Premium only) | Claude: N/A
Grammarly: $12/month (annual) | Claude: $20/month
Grammarly: 150+ apps (Gmail, Office, Slack, etc.) | Claude: Web interface + API only
Grammarly: Not applicable | Claude: 200,000 tokens
Grammarly: Basic grammar and spell check only | Claude: Full Claude 3.5 Sonnet with usage limits
Grammarly: Yes—instant feedback while typing | Claude: No—requires manual submission
Grammarly: 500+ integrations | Claude: N/A
Grammarly: Unlimited (limited features) | Claude: N/A
Monthly Subscription Cost (Premium/Pro Tier)
Grammarly: $12.00/month | Claude: $20.00/month
Annual Subscription Cost (Premium/Pro Tier)
Grammarly: $144.00/year | Claude: $240.00/year
Grammarly: Single document | Claude: 200,000 tokens
Grammarly: 500+ integrations | Claude: API only (requires custom setup)
Grammarly: Limited (rewrites only) | Claude: Up to 150,000 words
Grammarly: Yes (500+ apps) | Claude: No (manual input required)
Grammarly: Yes (basic corrections only) | Claude: Yes (Claude 3.5 Haiku with limits)
Grammarly: N/A | Claude: Won coding tests
Grammarly: N/A | Claude: Slower (more thorough)
Grammarly: N/A | Claude: Growing adoption
Grammarly: N/A | Claude: Excellent (leading tool)
Grammarly: N/A | Claude: Text and code focused
Grammarly: N/A | Claude: Superior (Claude 4.6)
Grammarly: N/A | Claude: Standalone platform
Grammarly: N/A | Claude: Nuanced and contextual
Grammarly: N/A | Claude: 3 (text, image, PDF)
Grammarly: N/A | Claude: Sonnet 4.6, Opus 4.8
Grammarly: N/A | Claude: #1 (Opus 4.8 + Claude Code)
Grammarly: N/A | Claude: Via integrations / Computer Use
Grammarly: N/A | Claude: Strong (esp. European + Japanese)
Grammarly: N/A | Claude: Strict tool use + JSON schemas
Grammarly: N/A | Claude: Limited (API-based)
Grammarly: N/A | Claude: Claude Code + Computer Use
Grammarly: N/A | Claude: MCP-based (growing)
Grammarly: N/A | Claude: iOS/Android, catching up
Grammarly: N/A | Claude: Explicit cache markers (5m / 1h)
Grammarly: N/A | Claude: No public fine-tuning
Grammarly: N/A | Claude: Cloud-only (Bedrock / Vertex)
Grammarly: N/A | Claude: ~50 RPM / 40K ITPM (Sonnet 4.6)
Grammarly: N/A | Claude: Sonnet 4.6 (rate-limited)
Grammarly: N/A | Claude: Claude Pro $20/mo
Grammarly: N/A | Claude: Max $100–$200/mo
Grammarly: N/A | Claude: Sonnet 4.6: $3.00
Grammarly: N/A | Claude: 200,000–1,000,000 tokens
Grammarly: N/A | Claude: Web browser only, no native integration
Grammarly: N/A | Claude: No integration, manual file uploads required
Grammarly: N/A | Claude: Pro tier only ($20/month)
Grammarly: N/A | Claude: Strict safety guidelines
Grammarly: N/A | Claude: $20/month (Claude Pro)
Grammarly: N/A | Claude: Static as of April 2024
Grammarly: N/A | Claude: 92% (HumanEval)
Grammarly: N/A | Claude: $20 (Claude Pro)
Grammarly: N/A | Claude: 5+ (Web, iOS, Android, API, third-party apps)
Grammarly: N/A | Claude: 2-6 seconds average
Grammarly: N/A | Claude: 89% user satisfaction
Grammarly: N/A | Claude: Yes (fully independent)
Grammarly: N/A | Claude: 500-2000ms (chat response)
Grammarly: N/A | Claude: Web, iOS, Android, API
Grammarly: N/A | Claude: Claude 3.5 Sonnet, Claude 3 Opus, Claude 3 Haiku
Grammarly: N/A | Claude: ~10 million (reported by Anthropic, 2024)
Grammarly: N/A | Claude: ~10MB per upload (practical limit)
Grammarly: N/A | Claude: 2 years (launched March 2024)
Grammarly: N/A | Claude: $3 (Opus) / $0.80 (Haiku)
Grammarly: N/A | Claude: Claude 3.5 Haiku (capable)
Grammarly: N/A | Claude: No (April 2024 cutoff)
Coding Task Accuracy (HumanEval Benchmark)
Grammarly: N/A | Claude: 88% on HumanEval
Grammarly: N/A | Claude: 8+ (Web, Desktop, API, Slack, etc.)
Grammarly: N/A | Claude: Limited (Claude Teams requires separate setup)
Grammarly: N/A | Claude: 3-6 seconds average
Grammarly: N/A | Claude: 8.7/10 standalone
Grammarly: N/A | Claude: Code, text, images, PDFs, documents
Grammarly: N/A | Claude: None (chat interface only)
Grammarly: N/A | Claude: N/A (manual conversation only)
Grammarly: N/A | Claude: Manual context provision required
Grammarly: N/A | Claude: iOS app available
Grammarly: N/A | Claude: Depends on API tier
How to choose between Grammarly and Claude
Grammarly vs Claude — Structured Comparison Data
Machine-readable comparison dataset for Grammarly vs Claude. Contains 134 attribute comparisons, 5 FAQ pairs.
Grammarly vs Claude — Attribute Category Vocabulary
Taxonomy of attribute categories used to classify comparison data for Grammarly vs Claude.
Can I use Grammarly and Claude together?
Yes, they complement each other well. Use Claude to generate or brainstorm content, then run it through Grammarly for real-time grammar and style corrections. This is an ideal workflow for writers who want both creative assistance and polished output.
Does Claude replace Grammarly for writing?
No. While Claude can generate grammatically correct content, it's not designed as a real-time proofreader and lacks Grammarly's instant feedback across all your writing platforms. Claude excels at content creation; Grammarly excels at correction and polish.
Which is better for non-native English speakers?
Grammarly is better for non-native speakers because it provides real-time corrections and explanations as you type, with a focus on grammar fundamentals. Claude is better if you need help writing complex sentences or restructuring ideas, but won't catch small grammar errors in real-time.
Can Claude replace email and document writing tools?
Not fully. Claude can generate email drafts and documents, but lacks Grammarly's seamless integration into Gmail, Word, and other platforms. You'd need to copy-paste content between Claude and your writing tools, making it less efficient for daily workflows.
Is Claude's free tier sufficient compared to Grammarly's free tier?
It depends on your needs. Grammarly's free tier offers basic grammar checking everywhere you type. Claude's free tier (Claude 3.5 Haiku) offers better reasoning and content generation but requires you to manually paste text. For casual users, both free tiers are viable but serve different purposes.
How to Choose Between Grammarly and Claude
Primary Function: Grammarly has Grammar, spelling, and style checking tool, while Claude has Conversational AI assistant for reasoning and content generation.
Real-time Writing Corrections: Grammarly has Yes, across 500+ web apps and email, while Claude has No, requires manual input to interface.
Content Generation Capability: Grammarly has Limited to suggestions and rewrites, while Claude has Full content creation from scratch (essays, code, analysis).
Context Window Length: Grammarly has Single document/email focus, while Claude has 200,000 tokens (approximately 150,000 words).
Accuracy on Grammar Tasks: Grammarly has 97% accuracy on standard grammar detection, while Claude has 94% accuracy on grammar but not primary focus.
Free Tier Limitations: Grammarly has Basic corrections only; premium needed for advanced features, while Claude has 3.5 model available free; Claude 3.5 Sonnet requires subscription.
Integration Ecosystem: Grammarly has 500+ integrations (Gmail, Word, Slack, etc.), while Claude has Manual paste or API integration required.