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