Grammarly
AI writing assistant for grammar, tone, and clarity across every app
About
Grammarly is the best-known AI writing assistant, used by a reported 30M+ people. It checks grammar and spelling in real time across 1M+ apps and sites via browser extensions, desktop apps, mobile keyboards, and Office add-ins, then layers on tone detection, full-sentence rewrites, and clarity suggestions. Generative AI features — drafting, rewriting, summarizing, brainstorming — are available on all tiers with monthly prompt allowances (100 on Free, 2,000 on Pro). Pro at $12/member/month adds the plagiarism checker, brand voice, and advanced rewrites; Enterprise adds SSO, admin controls, and unlimited prompts. Educational institutions can get volume discounts. For students it is primarily an essay and thesis polisher with plagiarism prevention. Limitations worth knowing: it refines drafts rather than restructuring documents, some campuses restrict advanced rewriting features, and the free tier's AI allowance is small.
What it can do
- Real-time grammar and spelling checks across 1M+ apps
- Full-sentence rewrites and tone detection
- Generative AI drafting, rewriting, and summarizing
- Plagiarism checker (Pro)
- Browser extension, desktop app, mobile keyboard, Office add-in
- Style guides and brand voice (Teams/Enterprise)
Setup
Create a free account and install the browser extension or desktop app. Writing feedback appears automatically in supported apps; upgrade to Pro for rewrites and plagiarism checking.
Prerequisites
A web browser or supported app. Nothing else — the free tier needs no payment.
Use cases
Works with
Trust score — 9/10
Scored 9/10 (verified tier, metrics-v1). Evidence: 30M+ users (company-reported, widely corroborated); Free/Pro $12/mo tiers and generative AI prompt allowances verified across reviews; Limitation: refines drafts rather than restructuring; some campuses restrict advanced features.
Sources
Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.