Writer vs Copy.ai vs Grammarly

Compared on	Writer See pricing VisitRemove	Copy.ai From $24/mo VisitRemove	Grammarly Free plan · from $12/member/mo VisitRemove
What it is	Enterprise AI platform with agents, playbooks and brand style controls	AI platform for sales and marketing teams to automate go-to-market work	AI writing assistant for grammar, tone, rewrites and text generation
Free plan	No	No	Spelling, grammar and tone feedback, plus 100 AI prompts (the plans page does not state a period for the free prompts).
Cheapest paid plan	Not publishedWriter pricing	$24/mo billed annually (Chat)Copy.ai pricing	$12/member/mo billed annually (Pro)Grammarly pricing
What it covers	Not stated	Includes 5 seats and unlimited words in Chat; billed $288/yr on annual billing.	$144 per member per year on annual billing; quarterly option $60 per member every three months; 2,000 AI prompts per member per month.
Free trial	14-day free trial of Starter, no credit card required	None stated	7-day free trial of Pro
Platforms	Web	Web	Windows, macOS, Chrome extension, iOS, Android
Integrations (vendor's figure)	Not stated	2,000+ integrations	Not stated
Open source	No	No	No
Good for	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	Researching target accounts and drafting personalized outreach Turning a content brief into blog, email and social drafts Enriching CRM records and routing inbound leads	Proofreading emails and documents before sending Adjusting the tone of client messages Checking reports for plagiarism before publishing
Watch out for	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	No free plan is listed on the pricing page The Chat plan does not include workflow credits; they start with the Growth plan at $1,000/month Workflow credits are capped each month: 20K on Growth, 45K on Expansion and 75K on Scale	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
Made by	WRITER	CopyAI, Inc. (acquired by Fullcast)	Superhuman Platform (company formerly named Grammarly)

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.