AI Tool Comparison
Grammarly vs ChatGPT
An objective side-by-side comparison based on global rankings, AI scores, and monthly user data.
Higher Ranked
Grammarly
ProductivityAI writing assistant that checks grammar, tone, clarity, and style across every app you use.
AI Score66.5 / 100
#251
Global Rank
30M+
Monthly Users
VS
Higher Ranked
ChatGPT
Writing & ChatThe world's most popular AI chatbot for writing, coding, research, and everyday tasks.
AI Score97.4 / 100
#3
Global Rank
400M+
Monthly Users
Side-by-Side Comparison
| Grammarly | ChatGPT | |
|---|---|---|
| Category | Productivity | Writing & Chat |
| Global Rank | #251 | #3 |
| AI Score | 66.5/100 | 97.4/100 |
| Monthly Users | 30M+ | 400M+ |
| Pricing | Freemium | Freemium |
| Website | grammarly.com | chat.openai.com |
Pros & Cons
Grammarly
- 2026 consolidation of Premium/Business into one Pro plan simplifies the pricing structure
- Free tier includes genuine functionality (100 AI prompts/month), not just basic spell-check
- Meaningful annual billing savings — $144/year versus $360/year if billed monthly
- Free tier’s 100 AI prompts/month is a real constraint compared to Pro’s 2,000/member/month
- Superhuman Business Bundle bundles in email features, which may not be needed by all writing-focused users
- Enterprise pricing requires a custom quote for organizations needing unlimited prompts
ChatGPT
- Largest user base and ecosystem of any AI assistant, with the most third-party integrations
- Genuinely broad capability across writing, coding, research, and file analysis
- Custom GPTs allow tailoring the assistant to specific repeated tasks
- Frequent model updates keep it competitive on raw capability
- Free tier has usage limits and access to a lower-tier model than paid plans
- Can produce confident-sounding but incorrect information, especially without browsing enabled
- Breadth can mean less depth than a tool purpose-built for one specific workflow
- Data usage and training policies require attention for sensitive or regulated work