Grammarly
by Superhuman (formerly Grammarly)
AI writing assistant that checks, rewrites, and drafts across 1M+ apps and sites
Last reviewed 2026-06-20
Grammarly is an AI writing assistant that works across email, documents, browsers, and over a million apps and websites. It started as a grammar and spelling checker and now spans tone adjustment, full-sentence rewrites, generative drafting (GrammarlyGO), plagiarism and AI-text detection, and a set of task-specific writing agents. Most of its value is delivered inline as suggestions a person accepts or rejects, which makes it a copilot rather than an autonomous agent. In October 2025 Grammarly's parent company rebranded as Superhuman, uniting Grammarly, Coda, and Superhuman Mail into one suite, with the Grammarly writing product keeping its name. Alongside the rebrand, Superhuman introduced a proactive assistant called Superhuman Go that orchestrates first- and third-party agents across 100+ apps; the agentic layer is newer and supervised in practice. Grammarly reports more than 40 million daily users.
What it can do
Inline grammar, spelling, and clarity suggestions
CopilotChecks writing in real time across apps, sites, and the Grammarly editor, offering inline corrections the user accepts or rejects.
sourceTone adjustment and full-sentence rewrites
CopilotDetects tone and rewrites whole sentences for clarity, formality, or audience; the user chooses whether to apply each rewrite.
sourceGenerative drafting and summarizing (GrammarlyGO)
AssistantDrafts content from a prompt, rewrites for tone, and summarizes long threads or documents; output is produced on demand and edited by the user.
sourcePlagiarism and AI-text detection
AssistantScans text against academic papers, websites, and published works for similarity, and estimates the likelihood that text was AI-generated.
sourceTask-specific writing agents
SupervisedSpecialized agents (Proofreader, Paraphraser, Citation Finder, AI Grader, Reader Reactions, AI Detector, Plagiarism Checker, AI Chat) take immediate action when activated while the user stays in control of the work.
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Strengths
- +Works almost everywhere people write (1M+ apps and websites, browsers, email, and desktop apps)
- +Strong free tier with usable everyday grammar, spelling, and tone checking
- +Combines deterministic proofreading with generative drafting and task-specific writing agents in one tool
Limitations
- −Core behavior is inline suggestions, not autonomous action; the 'agents' are supervised and task-scoped
- −Generative and detection features (rewrites, plagiarism, AI detection) are gated behind paid tiers
- −Parent-company rebrand to Superhuman and rapid acquisitions (Coda, Superhuman Mail, Rows) add product-direction uncertainty
Overview
Grammarly is an AI writing assistant that works wherever you write: email, documents, browsers, and over a million apps and websites. It began in 2009 as a grammar and spelling checker and has expanded into tone adjustment, full-sentence rewrites, generative drafting (GrammarlyGO), plagiarism and AI-text detection, and a set of task-specific writing agents. It reports more than 40 million daily users.
What it does
The foundation is real-time, inline checking: grammar, spelling, clarity, and tone, surfaced as suggestions a person accepts or rejects (copilot). On top of that sit generative features (drafting from a prompt, rewriting for tone, summarizing long threads) and detection features (plagiarism similarity scanning and AI-text likelihood). In August 2025 Grammarly launched specialized writing agents (Proofreader, Paraphraser, Citation Finder, AI Grader, Reader Reactions, AI Detector, Plagiarism Checker, AI Chat) that take immediate action when activated, while the user stays in control of the work, which is best described as supervised-agent rather than autonomous.
Integrations & setup
Grammarly runs as a browser extension, desktop app, and integrations into Gmail, Google Docs, Microsoft Word and Outlook, Slack, and many other apps and sites. Since the parent-company rebrand it also sits alongside Coda and Superhuman Mail in the Superhuman suite, with the proactive Superhuman Go assistant orchestrating first- and third-party agents across 100+ apps.
Pricing
Freemium. The Free plan covers basic grammar, spelling, tone, and a limited number of AI prompts. Pro starts at about $12/member/month billed annually (roughly $30/month month-to-month) and adds rewrites, plagiarism and AI detection, and more AI prompts. Enterprise is contact-sales and adds proactive AI, BYOK encryption, data loss prevention, and admin controls.
Best for / not for
Best for individuals and teams who want broad, low-friction writing help everywhere they type, with a genuinely useful free tier. Less suited to anyone expecting an autonomous agent that completes multi-step work without per-action approval; Grammarly is a copilot first, with supervised task agents layered on.
Alternatives
Writer targets governed enterprise content generation; Jasper, Writesonic, and Rytr target marketing and long-form generation. Notion AI overlaps for in-document writing inside a workspace.
What people are saying
We aggregate real LinkedIn discussion into sentiment for the agents people search most. Grammarly isn't tracked yet, want it added? Request tracking.
FAQ
Is Grammarly an AI agent or a writing assistant?+
Primarily a writing assistant. Most of what it does is inline suggestions and on-demand generation that a person accepts or edits (copilot/assistant). It added task-specific writing agents in 2025, but those are supervised and activated by the user rather than acting end-to-end on their own.
Did Grammarly rebrand to Superhuman?+
The parent company rebranded as Superhuman in October 2025, uniting Grammarly, Coda, and Superhuman Mail into one suite. The Grammarly writing product keeps its name within that suite.
What is GrammarlyGO?+
GrammarlyGO is Grammarly's generative AI feature for drafting content from scratch, rewriting for tone, and summarizing long emails and documents, available within paid plans.
Sources
- Grammarly (official site) · accessed 2026-06-20
- Grammarly plans and pricing · accessed 2026-06-20
- Grammarly launches specialized AI agents (Grammarly Blog) · accessed 2026-06-20
- Announcing company rebrand to Superhuman (Grammarly Blog) · accessed 2026-06-20
Last reviewed 2026-06-20