Grammarly vs Claude vs ChatGPT: Best AI Writing Assistant 2025
Grammarly vs Claude vs ChatGPT for Writing: Which Is Best?
AI writing tools fall into two categories: grammar checkers (Grammarly) and AI writers (Claude, ChatGPT). Here is how they compare and when to use each.
TL;DR: Use Grammarly for real-time grammar/spelling correction in any app. Use Claude for high-quality content drafting and editing. Use ChatGPT for versatile writing + other tasks. Best combo: Grammarly + Claude.
These Tools Serve Different Purposes
| Feature | Grammarly | Claude | ChatGPT |
|---|---|---|---|
| Type | Grammar checker | AI writer/assistant | AI writer/assistant |
| Works In | Every app (browser ext) | claude.ai / API | chatgpt.com / API |
| Grammar/Spelling | Best in class | Good (manual check) | Good (manual check) |
| Content Generation | Basic | Excellent | Very Good |
| Tone Detection | Real-time | On request | On request |
| Plagiarism Check | Yes (Premium) | No | No |
| Free Tier | Good (basic grammar) | Good (Sonnet model) | Good (GPT-4o mini) |
| Pro Price | $12/mo | $20/mo | $20/mo |
When to Use Each Tool
Use Grammarly When:
- You write emails, Slack messages, or documents throughout the day
- English is not your first language
- You need real-time correction as you type (in any app)
- You need plagiarism detection
- You want consistent tone across communications
Use Claude When:
- You need to draft blog posts, articles, or reports
- You need to rewrite or improve existing content
- You are analyzing long documents (contracts, research papers)
- You want the most natural-sounding AI writing
Use ChatGPT When:
- You need a versatile tool (writing + coding + analysis + images)
- You want to brainstorm ideas
- You need data analysis (Code Interpreter)
- You want custom GPTs for specific tasks
The Best Writing Stack
Most productive writers use a combination:
- Claude for drafting and improving content ($20/mo)
- Grammarly for catching grammar and spelling errors ($12/mo)
- Hemingway Editor for readability (free)
Total: $32/month for a professional writing toolkit. See also: all AI writing tools compared.
FAQ
Does Grammarly use AI?
Yes. Grammarly Premium now includes GrammarlyGO, an AI writing assistant. However, it is more limited than Claude or ChatGPT for content generation.
Is Grammarly Premium worth it?
For professionals who write daily, yes. The $12/month investment pays for itself in time saved. See our detailed Grammarly review.
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