Grammarly vs QuillBot vs Writer

Written head to head: Grammarly vs QuillBot, with when to choose each side.

Compared on	Grammarly Free plan · from $12/member/mo VisitRemove	QuillBot Free plan · from $8.33/mo VisitRemove	Writer See pricing VisitRemove
What it is	AI writing assistant for grammar, tone, rewrites and text generation	AI paraphrasing, grammar checking and summarizing tools for writers	Enterprise AI platform with agents, playbooks and brand style controls
Free plan	Spelling, grammar and tone feedback, plus 100 AI prompts (the plans page does not state a period for the free prompts).	Paraphraser in Standard and Fluency modes, up to 125 words at a time; Summarizer up to 1,200 words; Grammar Checker, AI Detector, Citation Generator, Translate and the extensions; a limited number of AI Chat queries a day	No
Cheapest paid plan	$12/member/mo billed annually (Pro)Grammarly pricing	$8.33/mo billed annually (Premium)QuillBot pricing	Not publishedWriter pricing
What it covers	$144 per member per year on annual billing; quarterly option $60 per member every three months; 2,000 AI prompts per member per month.	$99.95 billed every 12 months; also $39.95 billed every 3 months ($13.31/month).	Not stated
Free trial	7-day free trial of Pro	None stated	14-day free trial of Starter, no credit card required
Platforms	Windows, macOS, Chrome extension, iOS, Android	Web, Chrome extension, macOS, iOS, Android	Web
Integrations (vendor's figure)	Not stated	Not stated	Not stated
Open source	No	No	No
Good for	Proofreading emails and documents before sending Adjusting the tone of client messages Checking reports for plagiarism before publishing	Rewording sentences in an email or report for clarity Summarizing long articles before a meeting Checking a draft's grammar and generating citations	Producing on-brand marketing content in a company with style rules Automating research and drafting steps for sales and marketing teams Rolling out governed AI tools across departments
Watch out for	Free plan includes 100 AI prompts; Pro allows 2,000 per member per month Plagiarism and AI-text detection require Pro Unlimited prompts, BYOK encryption and custom roles are Enterprise-only	Free Paraphraser offers only the Standard and Fluency modes, up to 125 words at a time Plagiarism Checker is Premium-only, up to 25,000 words a month No free trial; refunds only where the law requires (14 days in the EEA and UK)	Starter is limited to 5 users, 5 playbooks, 3 active connectors and 3 scheduled routines Starter includes a limited Knowledge Graph (50 GB in a single graph) No free plan, and no published price for Starter
Made by	Superhuman Platform (company formerly named Grammarly)	Learneo, Inc.	WRITER

Entry prices are the cheapest paid plan, as each vendor publishes it; “What it covers” says what that price is per (a user, a channel, a brand, a number of contacts). The sources are listed on each tool's page.

Every tool in AI writing tools is on its category page, with the written head-to-heads on Compare.