ChatGPT vs Grammarly comparison

By starting price alone, ChatGPT is $7 cheaper. But price is not everything, so check the highlighted rows in the table below.

ChatGPT and Grammarly compared side by side in AI.

CurrencyUSDKRWEUR

ChatGPT

The most widely used general-purpose AI chatbot. Chat, writing, coding, image generation and web search in one place

What is good

  • No. 1 in users, so plenty of guides and tips
  • Widest range of features
  • Polished app and voice chat

What could be better

  • Tight usage limits on the free plan
  • Top features need the expensive Pro plans

ChatGPT official site

Grammarly

An AI writing assistant that fixes English grammar and sentences

What is good

  • English proofreading anywhere in browsers and apps
  • Useful for business English

What could be better

  • Advanced style and tone suggestions and paragraph rewriting are limited to 6 languages including English (Korean gets only spelling, basic grammar and translation)
  • Monthly billing is expensive

Grammarly official site

At a glance

Highlighted rows are where they differ.

ItemChatGPTVisit siteGrammarlyVisit site
Starting price$8+Official USD price$15+Official USD price
Free tierFree plan availableFree plan available
Korean supportGoodAverage
Main models
  • GPT-6 (Sol)
  • GPT-6 Luna
  • GPT-6 Pro (Astra)
  • GPT-6.1 Sol
  • Image: ChatGPT Images 2.5
  • In-house proofreading model + generative AI
  • AI agents (AI Detector/plagiarism check/AI Grader and others)
  • Superhuman Go
TypeAI servicesAI services
CategoryChatbot/Assistant, Image Generation, CodingWriting/Productivity
CompanyOpenAI, United StatesGrammarly (Superhuman), United States
Plans
  • Free
  • Go $8
  • Plus $20
  • Pro $100/$200/$500
  • Business $25 (annual $20)
  • Enterprise/Edu
  • Free
  • Pro $15 (annual billing $12)
  • Business $40 ($33 annual, Mail included)
  • Enterprise
Pros
  • No. 1 in users, so plenty of guides and tips
  • Widest range of features
  • Polished app and voice chat
  • English proofreading anywhere in browsers and apps
  • Useful for business English
Cons
  • Tight usage limits on the free plan
  • Top features need the expensive Pro plans
  • Advanced style and tone suggestions and paragraph rewriting are limited to 6 languages including English (Korean gets only spelling, basic grammar and translation)
  • Monthly billing is expensive

Prices and benefits may change. Check the official site before you pay.

Prices converted at 1 USD = ₩1,327.84 (2026-10-20). Original price shown in brackets. Taxes as listed by each provider.

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