AI writing assistant that checks, rewrites and drafts text in apps and websites
Grammarly is an AI writing assistant (founded 2009). It fixes grammar, spelling and punctuation, shows and adjusts the tone of your writing, rewrites full sentences and generates text from AI prompts. It also has AI agents (proofreader, paraphraser, AI detector, humanizer, reader reactions, citations), a plagiarism checker, style guides and brand tones for teams, and Docs, its own document editor.
It works in more than 1 million apps and websites: as a browser extension for Chrome, Safari, Firefox and Edge, as a desktop app for Windows and Mac, in Microsoft Office and Google Docs, and as a keyboard for iPhone, iPad and Android. Enterprise customers get REST APIs.
Plans: Free (100 AI prompts per month), Pro (US$144 per member per year, or US$30 monthly; 2,000 prompts per month; 7-day free trial) and Enterprise (contact sales).
Grammarly is now part of Superhuman, together with Coda and Superhuman Mail. It states 40 million people and 50,000 organizations use it (home page).
Individuals, students and professionals, teams and businesses, large organizations, and schools and universities. For teams the site names customer support, marketing, IT, sales and HR.
Has a keyboard app for iPhone, iPad and Android and its own Docs editor; LanguageTool lists no mobile app.
Offers REST APIs for Enterprise customers, plus style guides and brand tones for teams; Quillbot lists no public API.
The Free plan includes 100 AI prompts per month and works as a browser extension and a mobile keyboard; Hemingway's AI tools need the paid Editor Plus.
Writing editor that highlights hard-to-read sentences and scores readability
The Classic desktop app is a one-time US$19.99 purchase that works offline; Grammarly Pro is a subscription.
AI content platform with marketing agents for on-brand text and images
Has Studio, a no-code builder for custom agents and apps, an MCP server, and image generation and editing for campaigns.
Grammar, spelling, punctuation and style checker for more than 30 languages
Its core is open source under LGPL 2.1 or later, and you can run your own LanguageTool server; Grammarly is not open source.
AI writing tools: paraphraser, grammar checker, AI detector, summarizer and more
Premium costs US$99.95 per year; Grammarly Pro costs US$144 per year. It also has a Summarizer and a Translator for 40+ languages.
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