Grammarly vs ChatGPT (OpenAI)

ChatGPT (OpenAI) starts cheaper at $0/mo (Plus at $20). Pricing isn't the whole story below.

Both compete in: writing

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Grammarly

$12/mo

Grammar, tone, and clarity across every app.

Grammarly remains the default for grammar + tone checking. The 'Grammarly Go' generative features are catching up but are not the main reason to subscribe.

Strengths

Works in every text field across every app
Tone detector is uniquely useful
Plagiarism checker on Premium
Trusted by enterprises

Trade-offs

Generative features lag dedicated tools
Browser extension can be invasive

Best for

Anyone who writes a lot in emails, Docs, or Slack and wants a safety net.

Try Grammarly →

ChatGPT (OpenAI)

$0/mo (Plus at $20)

The category-defining general-purpose AI assistant.

ChatGPT has the broadest feature surface: image gen, voice, custom GPTs, web browsing, code execution. Often the right default; sometimes beaten on specific tasks by Claude or Perplexity.

Strengths

Broadest feature surface
Custom GPTs ecosystem
Best voice mode
Excellent mobile app

Trade-offs

Output style can feel generic
Plus tier rate limits at peak hours

Best for

Generalists who want one tool that does everything decently.

Try ChatGPT (OpenAI) →

Which should you pick?

If your top criterion is price: ChatGPT (OpenAI). If you care most about works in every text field across every app, pick Grammarly. If broadest feature surface matters more to you, ChatGPT (OpenAI) is the better fit.

Both are worth trying — most teams who switch land on whichever they evaluated second, because the first one set the comparison they didn't know they needed.