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Side-by-side comparison

ChatGPT vs Grammarly

Plans, free tiers and API access for ChatGPT and Grammarly, from each vendor's own pages. Last checked Oct 4, 2026.

ChatGPTAssistantGrammarlyWriting

The short answer

Pricing and features

ChatGPTGrammarly
Starting price
$20/mo
$30/mo
Paid plans
  • Plus$20/mo
  • Business$25/mo
  • Pro$30/mo
Free plan
Free planFree tier with limited messages and models
Free planFree plan with grammar, spelling and punctuation suggestions and 100 AI prompts a month
API access
API availableOpenAI API billed separately from ChatGPT plans
API availableAudit Logs API on Enterprise only; no public writing API listed
Best for
Individuals and teams who want a general-purpose assistant in browser and mobile apps, from quick questions to longer writing and analysis workflows.
Professionals and students who want writing feedback inside their everyday apps.
Watch out for
All plans carry usage limits that can tighten at peak demand; Plus/Go limits differ by model and feature. API access, rate limits, and data handling follow separate OpenAI API terms.
Pro is $30 monthly or $12 a month billed annually; Business needs at least 3 seats. Plan names and prices vary by region.
Category
Assistant
Writing
Last checked
Oct 4, 2026
Oct 5, 2026

How to choose

ChatGPT is a general-purpose assistant for questions, longer writing and analysis, while Grammarly is a writing-feedback tool that works inside your everyday apps. ChatGPT has a free tier with limited messages and models, and Plus costs 20 per month billed monthly. Grammarly Free includes grammar, spelling and punctuation suggestions plus 100 AI prompts a month. Grammarly Pro is 30 per month, or 12 per month billed annually, and Business is per seat at 25 per month, or 15 billed annually. ChatGPT usage limits can tighten at peak demand. The OpenAI API is billed separately from ChatGPT plans, and Grammarly lists no public writing API, only an Audit Logs API on Enterprise.

Reviewed Oct 5, 2026. Prices and plans can change, so confirm on the vendor's site.

Common questions

Which is cheaper, ChatGPT or Grammarly?

ChatGPT has the lower starting price ($20/mo versus $30/mo). Compare plans before choosing, since limits differ.

Is ChatGPT free?

Free plan. Free tier with limited messages and models

Is Grammarly free?

Free plan. Free plan with grammar, spelling and punctuation suggestions and 100 AI prompts a month

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