ChatGPT vs Grammarly
ChatGPT is a general-purpose AI assistant built around chat for questions, writing, coding and research, with a free tier and paid plans from $8 a month. It runs on web, iOS, Android and via API and adds browsing, voice, image generation, file uploads and code execution. Grammarly is an AI writing assistant built around reviewing and improving text, with grammar, tone, clarity, rewrites, plagiarism and AI-text detection, plus team style tools. Its free plan covers basic proofreading with a limited monthly AI prompt allowance; Pro starts at $12 per member per month billed annually and has a trial. It works on web, Windows, Mac, Android and iOS, with no API listed.
Which to choose
Choose ChatGPT if you want a general-purpose chat assistant for everyday questions, writing, coding, research, or document and data work, including developer access through an API.
Visit chat.openai.comChoose Grammarly if you want an AI writing assistant for proofreading, tone, clarity, rewrites, and team style consistency across email, reports, proposals, and school papers.
Visit grammarly.comSide by side
| Detail | ChatGPT | Grammarly |
|---|---|---|
| What it is | OpenAI's AI assistant for questions, writing, coding and research, with a free tier and paid plans for more capable models. | An AI writing assistant that checks grammar, tone, and clarity for individuals, teams, and organizations. |
| Pricing | Free tier | Free tier |
| Paid plans from | $8 per month | $12 per month |
| Free plan | Yes | Yes |
| Free trial | No | Yes |
| Platforms | Web, iOS, Android, API | Web, Windows, Mac, Android, iOS |
| API | Yes | No |
| Checked against its site | Not yet | Nov 3, 2026 |
| Features |
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Written by AIToolMaps from the two listings, which come from each tool's official site. Full details: ChatGPT · Grammarly.