Grammarly is an AI-powered writing assistant that works as a browser extension, desktop app, and mobile keyboard to improve writing quality across emails, documents, and messages. It combines real-time grammar checking, tone detection, and a growing suite of AI agents to help users write with confidence and clarity in any context. In late 2025, Grammarly's parent company rebranded to Superhuman, uniting Grammarly's writing tools with Coda's workspaces, Superhuman Mail, and the new Superhuman Go proactive AI assistant — but the Grammarly product and its core features remain unchanged. Beyond basic proofreading, Grammarly now offers specialized AI agents for reader reactions, grade prediction, fact-checking, AI detection, and humanization, plus multilingual support in 22+ languages, making it a comprehensive writing and productivity platform for individuals, students, teams, and enterprises.
What This Cheat Sheet Covers
This topic spans 17 focused tables and 124 indexed concepts. Below is a complete table-by-table outline of this topic, spanning foundational concepts through advanced details.
Table 1: Core Correction Features
Grammar and spelling correction are Grammarly's original foundation — the real-time red underlines that catch errors as you type across every app. Mastering which error types Grammarly catches helps you rely on them appropriately without blindly accepting every suggestion.
| Feature | Example | Description |
|---|---|---|
I seen it yesterday → I saw it yesterday | Detects and corrects grammatical errors including verb tense, subject-verb agreement, and incorrect word forms in real time. | |
recieve → receive | Catches typos, misspelled words, and commonly confused words (their/there/they're) with context-aware suggestions. | |
Lets eat grandma → Let's eat, grandma | Fixes missing commas, periods, apostrophes, and misused punctuation marks to ensure proper sentence structure. | |
I need some peace and quite → peace and quiet | Uses AI to identify words spelled correctly but used incorrectly in context (e.g., affect/effect, its/it's). | |
I'm tired, I need sleep → I'm tired; I need sleep | Identifies incorrectly joined independent clauses and suggests semicolons, conjunctions, or periods as fixes. | |
I saw cat → I saw a cat | Detects missing or incorrect articles (a, an, the) and suggests corrections for natural English flow. |