Overview
Grammarly is the AI writing assistant with the largest global user base—over 40 million monthly active users and over 50 million paid users (including post-merger with Coda), covering 500,000 organizations and thousands of universities. At the end of 2024, Grammarly completed the acquisition of the collaborative document tool Coda, and in 2025 officially renamed the company to Superhuman (after also acquiring the email AI tool Superhuman), forming a AI productivity suite combining "writing + documents + email."
The key upgrade from 2024 to 2026 is Grammarly Agents—transforming the previous simple "grammar check + rewrite" into expert agents for different writing scenarios: Citation Finder (automatically find citation sources), Reader Reaction (predict reader reactions), Plagiarism Checker (academic plagiarism detection), Expert Writer (provide writing advice based on professional role), and more than a dozen other agents, each with its own role.
The core capability remains "providing real-time suggestions wherever you write"—browser extensions, desktop apps, integrations with Word / Google Docs / Outlook / Slack / Gmail, mobile keyboards, etc., covering almost all writing entry points.
Key Features
- Grammarly Agents: More than a dozen expert agents including Citation Finder, Reader Reaction, Plagiarism, Expert Writer, AI Grader, etc., providing targeted advice by scenario
- Real-time Grammar / Spelling / Punctuation: Core capability of checking as you type, with industry-leading accuracy and coverage, still the de facto benchmark for English writing scenarios
- Style and Tone Adjustment: Intelligently adjust writing style and tone based on audience, scenario, and purpose, with emotional feedback like "this sounds too harsh / too wordy"
- Generative AI Writing: Started with GrammarlyGO, now upgraded to Grammarly Authorship + Generative AI, directly helping you draft, rewrite, expand, and change tone
- AI Detection and Originality: Authorship reverse capability: mark which paragraphs are AI-generated, combined with Plagiarism Checker to provide credible reports
- Full Platform Integration: Browser extensions, desktop, Office, Google Docs, Slack, Gmail, Outlook, mobile keyboards, etc., hundreds of entry points
- Coda + Superhuman Suite: The merged Superhuman suite integrates Grammarly + Coda collaborative documents + Superhuman email AI, with AI working consistently across writing / documents / email
- Team Style Guide: Enterprise version allows setting brand language standards, compliance words, and sensitive words, automatically followed by all team members in writing
Use Cases
- All users who need grammar checking and polishing in English writing
- Real-time tone and expression optimization for business emails, Slack, and documents
- One-stop grammar + citation + plagiarism checking for academic papers
- Content marketing / PR / Copywriting teams maintaining consistent brand style
- Non-native English speakers improving professional English writing
- Superhuman suite users using Grammarly + Coda + Superhuman for daily writing / email / document workflows
Pros
- Most authoritative English grammar checker, with over 40 million MAU stability and coverage unmatched
- Works silently in almost all English writing entry points, highest integration
- Grammarly Agents upgrade a "single error correction tool" into multi-scenario experts
- Authorship + Plagiarism still provide credible originality proof in the AI era
- After merging Coda + Superhuman, forms an integrated "writing / document / email" suite
Pricing
Free (basic grammar / spelling / punctuation check + limited AI rewrite quota); Pro about $12/month (annual payment, formerly Premium, full AI rewrite, tone, Agents, Plagiarism); Business about $15/person/month (team Style Guide, brand language, management controls); Enterprise on demand (SSO, compliance, API, advanced Authorship capabilities). Coda + Superhuman are gradually launching unified "Superhuman suite" subscription tiers after the merger, with existing Grammarly users able to upgrade smoothly.
Summary
Grammarly remains a "must-install" for English writing—over 40 million MAU stability, penetration through nearly a hundred integration points, and multi-scenario expertise from the Agents upgrade, no other tool can replace it. After merging Coda and Superhuman in 2024-2025, it has evolved from a "grammar tool" to a "writing / document / email" three-piece productivity platform. Heavy English workers are advised to go directly to Pro or Business. Not applicable for Chinese writing scenarios; domestic users can pair with Mita, Kimi, Quark, etc.
Version History
- Superhuman Suite / Grammarly Agents (2025-2026): Company renamed to Superhuman, Grammarly + Coda + Superhuman integrated into AI productivity suite; Grammarly Agents launched with over a dozen expert agents
- Grammarly + Coda Merger + GrammarlyGO Upgrade (2024): Acquired Coda collaborative document tool; GrammarlyGO upgraded to Authorship + generative AI full writing capabilities
- GrammarlyGO (2023): First introduced generative AI rewrite, draft, and expand capabilities
- Grammarly Classic (2009-2022): Started as a grammar checker, long-term leader in the English writing assistance track