Grammarly checks grammar, spelling, clarity and tone wherever you write, and adds AI rewriting, generation, plagiarism checks and AI detection on its paid plan. Free covers mistakes, tone detection and 100 AI prompts a month. Pro costs $12 a month billed yearly ($144), $20 a month billed quarterly or $30 month to month, with full-sentence rewrites, fluency suggestions, plagiarism and AI text detection and 2,000 AI prompts, after a 7-day free trial. Grammarly now belongs to Superhuman, the renamed parent company, which also sells Enterprise plans through Superhuman Go.
Reviewed by EdGrows·Updated Sep 28, 2026This analysis is based on documentation, public user reports, and vendor materials — not yet on our own hands-on testing. How we rate
Grammarly started as a grammar checker and became the writing layer on top of almost every app people type in. Its extension, desktop apps and phone keyboard underline mistakes and suggest fixes in email, documents, chat and social posts, and its AI features rewrite sentences, adjust tone and generate text from a prompt. Grammarly says more than 40 million people and 50,000 organizations use it.
The company around it has changed. In October 2025 Grammarly renamed itself Superhuman after the email client it had bought, and it now sells a suite: Superhuman Go, an AI assistant, plus Grammarly, the Coda documents app and Superhuman Mail. In June 2026 Superhuman announced it was acquiring GPTZero, one of the best-known AI detectors. Grammarly itself keeps its name, its apps and its plans.
Grammarly's plans as shown to us in euros on September 28, 2026. US prices are in the table.
| Plan | Price | AI prompts | Highlights |
|---|---|---|---|
| Free | $0 | 100 a month | Spelling, grammar and punctuation, tone detection |
| Pro | $12 a month billed yearly ($144), $20 billed quarterly, $30 monthly | 2,000 per member a month | Sentence rewrites, tone adjustment, fluency, plagiarism and AI detection, team style guide |
| Enterprise | Custom, through Superhuman Go | Unlimited | Proactive AI, data loss prevention, customer-managed keys, custom roles, dedicated support |
Prices are per member. Pro starts with a 7-day free trial; Grammarly offers education pricing separately.
The yearly plan is where Pro makes sense: $144 against $360 for twelve months of monthly billing. Quarterly billing, $60 every three months, is a middle ground for students who only need it during a semester.
Free already fixes the mistakes that matter most, so the question is whether you need the rest:
| You want to | Free | Pro |
|---|---|---|
| Fix spelling, grammar and punctuation | Yes | Yes |
| See the tone of your writing | Yes | Yes |
| Rewrite whole sentences in one click | No | Yes |
| Adjust tone and write fluently in English | No | Yes |
| Check for plagiarism and AI-generated text | No | Yes |
| Generate or rewrite with AI prompts | 100 a month | 2,000 a month |
| Share a style guide and brand tone with a team | No | Yes, one of each |
Non-native English speakers get the most from Pro, because fluency and rewrite suggestions address phrasing rather than errors. Native speakers who write short emails often find Free enough.
Grammarly's reach is the reason people keep it. One account covers browsers, Word, Google Docs, desktop apps and phone keyboards, and the suggestions explain themselves well enough to accept or ignore at a glance, so the tool stays out of the way. For teams, style guides, brand tones and snippets keep writing consistent, and Enterprise adds the data controls that corporate IT asks about.
Its limits follow from the same focus. Corrections are built for English, so people writing mainly in other languages are better served by DeepL. AI prompts help with rewrites and short drafts, but long-form generation is better done in a chat assistant or a dedicated AI writer. And the features students often want most, plagiarism checks and AI detection, sit behind Pro, which costs $30 on monthly billing.
For paraphrasing and summarizing, QuillBot is cheaper and stronger, with a grammar checker attached. Wordtune specializes in rewriting sentences in different styles. DeepL leads for translation and writes well across several languages. And for judging whether text was written by AI, GPTZero, now owned by Grammarly's parent company, and Originality.ai are the specialists.
For most people the free version catches the mistakes that matter. Pro billed yearly pays off for non-native speakers, whose drafts benefit most from fluency and rewrite suggestions, for students who need plagiarism checks, and for professionals whose writing goes straight to clients. Organizations that need data controls should ask about Enterprise, which Grammarly now sells through Superhuman Go.
Three ways, all per member: $144 a year, which averages $12 a month, $60 every three months, or $30 month to month. Grammarly lists prices in US dollars by default and offers regional pricing in euros, British pounds and Indian rupees, which appears at checkout. Pro starts with a 7-day free trial, and Grammarly emails a reminder two days before it ends.
It corrects spelling, grammar and punctuation, shows the tone of what you wrote and allows 100 AI prompts a month for generating or rewriting text. It works in the same places as Pro, from the browser extension to the desktop apps and phone keyboard. Full-sentence rewrites, tone adjustment, plagiarism checks and AI detection need Pro.
Full-sentence rewrites with one click, tone adjustments, fluency suggestions for writing naturally in English, unlimited personalized suggestions, inclusive language and citation consistency checks, detection of plagiarism and AI-generated text, and 2,000 AI prompts per member each month. Teams on Pro also get a style guide, a brand tone, snippets and analytics.
Grammarly simplified its lineup to Free, Pro and Enterprise. Premium became Pro, and larger organizations now buy Grammarly Enterprise, which Grammarly sells through Superhuman Go with unlimited AI prompts, data loss prevention, customer-managed encryption keys, custom roles and dedicated support.
Superhuman is the new name of the company behind Grammarly, adopted in October 2025. It sells a suite of AI tools, Superhuman Go, Grammarly, Coda and Superhuman Mail, and in June 2026 it announced it was acquiring the AI detector GPTZero. For individual users Grammarly still works and is priced as before.
Yes. Pro includes AI detection alongside the plagiarism checker, and Grammarly also offers a free AI Detector tool. Treat any detector's verdict as a signal, not proof: human writing can be flagged and edited AI text can pass, which is why teachers and editors are advised to combine it with other evidence.
Yes. Grammarly has add-ins for Microsoft Office and Google Docs, desktop apps for Windows and Mac, extensions for Chrome, Safari, Firefox and Edge, and keyboards for iPhone, iPad and Android, so suggestions follow you across email, documents and chat.
For correcting and polishing writing, yes: Grammarly's suggestions are broader and it works inside more apps. QuillBot is cheaper and stronger as a paraphraser and summarizer. Many students use QuillBot for rewording and Grammarly for the final check.
Anthropic's assistant, built around long-context reasoning and code. Strong at $20; the usage limits are the unpublished part.
Google's assistant, bundled with storage and Workspace access. Plus is $4.99, Pro $19.99 with a 1 million token context, and Ultra from $99.99.
Visual automation with 3,000+ apps, billed in credits: a free plan with 1,000 a month, then $9 to $29 a month billed yearly for 10,000 credits.