Grammarly is an AI writing assistant that checks and improves what you type across many apps and websites.
In plain words
As you write, Grammarly flags possible problems and suggests fixes that fit the context: spelling, grammar, punctuation, wordiness, style and tone. It runs through desktop apps for Windows and Mac, a browser extension, a mobile keyboard and its own online editor. It began as a tool that checked students' grammar and has grown into a broader AI tool that can also suggest rewrites. In 2025 the company bought Coda and the Superhuman email app, and Grammarly now sits inside the Superhuman suite.
A quick example
Imagine typing an email that sounds sharper than you meant. Grammarly underlines a sentence, points out the tone, and offers a gentler rewrite that you can accept with a click or ignore.
Where you'll meet it
- Emails, documents and messages at work or school.
- Typing on phones with the Grammarly keyboard.
Related
Sources
- DocsHow does Grammarly work?, Grammarly Support · read 29 Sept 2026
- DocsAbout Grammarly, Grammarly · read 29 Sept 2026
Checked by WhatIsAI against the sources above · 29 Sept 2026. Spotted an error? Report it.