Grammarly

Grammarly is an AI writing assistant that checks grammar, improves clarity, and adjusts tone across everything you write. The company has operated for more than a decade and now serves 40 million individuals and 50,000 organizations. It works through browser extensions, desktop applications, mobile apps, and direct integrations with tools like Google Docs and Microsoft Office, providing real-time suggestions as you type. The goal is to stay invisible until you need help, then surface suggestions inline without breaking your workflow.

The problem it solves is the gap between what you mean to say and how it actually reads. Writing that's technically correct can still land poorly, whether it's too formal for a casual Slack message or too blunt for a client email. Tone is hard to judge when you're the one writing, and most people don't have an editor reviewing every message they send. Grammarly catches grammatical errors as a baseline, then goes further with suggestions for sentence structure, word choice, and tone. It tells you how your writing might come across to readers before you send it, which is information you otherwise wouldn't have until someone reacted badly.

The core features cover grammar and clarity checking, tone adjustment, and full sentence rewriting. The grammar checking catches the obvious mistakes like subject-verb agreement and misplaced commas, plus more subtle issues like wordiness and passive voice. Tone adjustment suggests ways to modify writing for different contexts while maintaining your voice. If a message sounds too aggressive, it'll flag that and offer alternatives. You can rephrase a sentence with one click if the original isn't working. Reader feedback gives insight into how the text might be perceived, whether it sounds confident, friendly, formal, or something else. That feedback helps you calibrate before hitting send.

The platform also includes generative AI capabilities where you can prompt it to write or expand on text. The free tier offers 100 AI prompts per month, and paid plans go up to 2,000. You can ask it to draft something from scratch, rewrite a section in a different style, or expand a bullet point into a full paragraph. Premium plans add plagiarism detection, which scans your text against a database of web pages and publications to flag potential overlap. There's also AI detection, which identifies content that was likely generated by an AI model. That feature is useful for educators checking student work or anyone who needs to verify that content is human-written.

Grammarly integrates almost everywhere you write. The browser extension covers web apps like Gmail, LinkedIn, and Slack in the browser. The desktop app handles documents. Mobile keyboards work on phones so your texts and emails get the same treatment. Direct integrations with Google Docs, Microsoft Word, and other productivity tools mean you don't need to copy text into a separate editor. The system learns from your writing over time, building a profile of your style and the terms you use so it doesn't keep flagging things you write intentionally. Custom dictionaries let you add company terminology and names that shouldn't be corrected.

The audience ranges from individual writers who want to catch mistakes to enterprise teams that need consistent communication standards. Students and academics use it for papers and assignments. Professionals use it for email, reports, and client communication. Organizations use the enterprise tier for company-wide governance, style guides, and analytics on how teams communicate. The company claims organizations see roughly 17x ROI, saving about 5,000 dollars per employee per year through improved communication efficiency, though your results will depend on how much your team writes and how much time poor communication currently costs you.

What sets Grammarly apart is its long track record and its privacy stance. The company states it does not sell or monetize user content for advertising or model training, which matters for enterprise customers who worry about sensitive content being used to train AI models. Recently, Grammarly became part of Superhuman, expanding its scope into broader productivity solutions beyond writing alone. Pricing follows a freemium model. The free tier covers basic error checking and tone detection. Grammarly Pro runs 12 dollars per month when billed annually or 30 dollars monthly, adding advanced features like full sentence rewrites and 2,000 AI prompts. Enterprise pricing is custom and includes team management, style guides, and organizational controls.