Grammarly vs Microsoft Copilot comparison

By starting price alone, Microsoft Copilot is $5.01 cheaper. But price is not everything, so check the highlighted rows in the table below.

Grammarly and Microsoft Copilot compared side by side in AI.

CurrencyUSD KRW EUR

Grammarly

An AI writing assistant that fixes English grammar and sentences

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

Microsoft's AI assistant built into Windows, Edge and Office

Highlighted rows are where they differ.

Item	GrammarlyVisit site	Microsoft CopilotVisit site
Starting price	≈€13.35+ ($15)Official USD price	≈€8.89+ ($9.99)Official USD price
Free tier	Free plan available	Free plan available
Korean support	Average	Good
Main models	In-house proofreading model + generative AI AI agents (AI Detector/plagiarism check/AI Grader and others) Superhuman Go	OpenAI GPT-5 family (Smart/Think Deeper) GPT-5.5/Claude selectable for business MAI in-house models (image/voice)
Type	AI services	AI services
Category	Writing/Productivity	Chatbot/Assistant, Writing/Productivity
Company	Grammarly (Superhuman), United States	Microsoft, United States
Plans	Free Pro $15 (annual billing $12) Business $40 ($33 annual, Mail included) Enterprise	Free M365 Personal $9.99 Family $12.99 Premium $19.99 Pro $99.99 For business: Copilot Business $21 (annual), Enterprise $30 (annual)
Pros	English proofreading anywhere in browsers and apps Useful for business English	Works directly with Windows, Word and Excel Latest-level models available for free
Cons	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	Office integration features need a Microsoft 365 subscription Weak personality as a standalone chatbot

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

Prices converted at 1 USD = ₩1,325.57 (2026-10-21). Original price shown in brackets. Taxes as listed by each provider.