Superhuman (formerly Grammarly Inc.) · AI Grammar, Tone & Clarity Assistant
Grammarly embeds into the apps you write in — Gmail, Google Docs, Word, Slack, and 1 million+ other apps — and corrects grammar, flags tone mismatches, and rewrites sentences for clarity as you type. The free tier handles basic grammar; Pro ($12/month billed annually) adds AI rewrites, plagiarism detection, and tone adjustment.
Best for
Professionals who write frequently across email, docs, and messages and want grammar, tone, and clarity corrections embedded in every tool they already use — without a separate editing step
Not ideal for
Users who need to generate long-form content from scratch — ChatGPT or Jasper are better for drafting. Also not a substitute for expert review in high-stakes legal or medical writing.
Who it's for
Professionals, managers, and teams who write frequently across multiple platforms and need consistent grammar, tone, and clarity without switching tools
Grammarly's defensible position is distribution: it is embedded in the apps where writing actually happens, not in a separate chat window. Few other AI writing tools work inline across Gmail, Slack, Word, Google Docs, and a browser simultaneously. Generative AI and writing agents add on top of that foundation, but Grammarly's real job is the last-mile editing pass — catching what you miss when writing fast. If your primary need is generating content, a standalone AI assistant is more capable.
Who should use it
Professionals who write multiple emails, Slack messages, and documents daily and want automated grammar and tone corrections embedded in every tool — without a separate review step.
Who should skip it
Users who primarily need to generate long-form content from scratch — ChatGPT, Claude, or Jasper are better for that use case. Grammarly is an editor, not a content generator.
Free
Free
Billed monthly
Pro
$12/member/month
Billed annual
Enterprise
Custom
Billed annual
Free tier limits: Basic grammar and spelling only. Tone detection available but no rewrites. 100 AI prompts/month. No plagiarism detection.
Note: Pro is $12/member/month billed annually ($144/year), $60 quarterly, or $30 billed monthly, for 1–149 members (Pro replaced the old Business plan). Enterprise pricing is custom. Organization APIs (Analytics, License Management, Writing Score, AI Detection beta, Plagiarism Detection beta) are available for business customers.
API pricing
Organization REST APIs (Analytics, License Management, Writing Score, AI Detection, Plagiarism Detection) — not a general writing-assistant API
Client-facing email review
Catches tone issues (too blunt, too casual), grammar errors, and unclear sentences inline before you send — without a separate editing step.
Consistent team communication
Style guides and brand tone settings (1 each on Pro, unlimited on Enterprise) help everyone's writing match the company voice, flagging deviations automatically.
Polishing AI-generated drafts
Running ChatGPT-generated copy through Grammarly catches the grammar and tone issues that LLMs commonly introduce, particularly around sentence variety and register.
Quick tone check before escalations
Before sending a message to a frustrated client or senior stakeholder, the tone detector flags whether the message reads as defensive, dismissive, or unclear.
Grammarly vs. Notion AI
Notion AI lives inside your Notion workspace and is best for agentic tasks, drafting, and summarizing where your docs already live. Grammarly works everywhere else — Gmail, Slack, Word, any browser — and focuses on real-time editing corrections rather than drafting.
Grammarly vs. Jasper
Jasper is a marketing content platform with purpose-built agents and brand controls. Grammarly is an inline editing assistant for everyday professional writing. They target different workflows — Jasper creates content, Grammarly improves it.
Is Grammarly free?
Yes. The free plan covers grammar, spelling, and punctuation corrections with 100 AI prompts/month. Pro ($12/member/month billed annually) adds sentence rewrites, generative AI, plagiarism detection, and 2,000 AI prompts/month.
How is Grammarly different from ChatGPT for writing?
Grammarly embeds inline in every app you write in and improves existing text in real time. ChatGPT requires you to copy text in and out, but is far better at generating long-form content from scratch. The common workflow: draft with ChatGPT, polish with Grammarly.
What apps does Grammarly work in?
Grammarly works in 1 million+ apps, including Gmail, Outlook, Google Docs, Microsoft Word, Slack, and LinkedIn, via browser extension (Chrome, Firefox, Safari, Edge), a desktop app for Mac and Windows, and iOS and Android apps.
Can Grammarly generate content, not just edit it?
Yes, on Pro. Grammarly's generative AI can draft content from prompts, rewrite sections for a different tone, and summarize long email threads, and its writing agents can detect AI text or find citations. Generation is a secondary feature — Grammarly's primary strength is editing.
Does Grammarly check for plagiarism?
Yes, on Pro and above. It checks against 16 billion web pages and flags passages that match external sources. Not available on the free tier.
Is Grammarly still its own company?
The company renamed itself Superhuman in late 2025. Grammarly keeps its name as a product in the Superhuman suite, alongside Coda, Superhuman Mail, and the Superhuman Go assistant.
Grammarly's core advantage is where it works: the browser extension, desktop app, and iOS and Android keyboards embed it inside Gmail, Outlook, Google Docs, Word, Slack, LinkedIn, and most other writing surfaces without copy-pasting. As you type, it catches grammar errors, suggests clearer phrasing, and flags tone signals — too formal, too harsh, off-brand — in real time. Its generative AI (Pro and above) adds full-sentence rewrites, draft generation from prompts, email summarization, and reply suggestions, and it now offers writing agents such as an AI Detector, Humanizer, Citation Finder, AI Grader, and Reader Reactions. Document-type awareness adjusts the suggestions to context: a Slack message gets different feedback than a legal brief. Pro ($12/member/month billed annually, $30 monthly) includes 2,000 AI prompts per month; the free tier is capped at 100. The company behind Grammarly renamed itself Superhuman in late 2025: Grammarly is now one product in the Superhuman suite alongside Coda, Superhuman Mail, and the Superhuman Go assistant. The honest scope: Grammarly excels at improving existing writing but is not the right tool for generating long-form content from scratch — ChatGPT or Jasper are better for that. For high-stakes legal, medical, or technical writing, it complements but does not replace specialist review.
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