Grammarly

What is Grammarly?

Grammarly is an AI writing assistant that checks grammar, spelling, clarity and tone, and can rewrite or generate text inside the apps and websites you already use. It works as a layer over your writing rather than as a separate word processor.

You install it as a browser extension, a desktop app for Windows or Mac, or a mobile keyboard, and it underlines issues as you type. Clicking a suggestion explains the change and applies it. Beyond proofreading, it offers paragraph rewrites, tone adjustments, a prompt-based generator and a set of task-specific AI agents that run in Grammarly Docs, its own writing surface.

Grammarly’s homepage says it is trusted by 40 million people and 50,000 organisations. In 2025 the parent company renamed itself Superhuman after buying the Superhuman email client, and press coverage reports that it also brought Coda into the same suite. The Grammarly product keeps its name, and the official site now describes it as part of Superhuman, with Enterprise access offered through Superhuman Go.

Key Features

Inline proofreading across apps matters most, because it fixes errors in email, documents and chat without copying text into another tool.

• Inline proofreading: Grammarly flags spelling, grammar, punctuation and clarity issues as you type in supported apps. Each underline opens a card with a short explanation, so you learn the rule while you accept or dismiss the fix.
• Tone detection and adjustment: The free plan shows how your writing is likely to come across, such as confident or formal. Pro adds suggestions that shift the tone, which helps when a reply to a client sounds sharper than intended.
• Full-sentence rewrites: Pro can rewrite whole sentences and paragraphs for clarity, flow and fluency in English. This is more than word swaps, so a clumsy paragraph can be restructured in one step rather than fixed line by line.
• Generative AI prompts: You can ask Grammarly to draft, shorten or reply to text using prompts. The official plans page lists 100 prompts a month on Free, 2,000 per member on Pro and unlimited prompts on Enterprise.
• AI agents: Grammarly lists agents including AI Grader, Citation Finder, Reader Reactions, Humanizer, Paraphraser and Proofreader. Several run in Grammarly Docs, and the site notes that some agent features are limited to paid customers.
• Plagiarism and AI detection: Pro checks text for similarity to published sources and estimates how much reads as AI-generated. Results point to the exact passages to revise, and the plagiarism checker suggests citations where matches appear.

Pros

Reach across apps is why most people pick Grammarly: one subscription covers browsers, desktop apps, Microsoft Office, Google Docs and phone keyboards.

• Works almost everywhere: Extensions for Chrome, Safari, Firefox and Edge sit alongside Windows, Mac, iPhone, iPad and Android apps. Your corrections follow you between email, chat and documents without switching tools.
• Useful free plan: The free tier catches spelling and grammar mistakes, shows tone and includes 100 AI prompts a month. Students and casual writers can get real value before paying anything.
• Explains its suggestions: Each correction comes with a short reason, not just a silent change. Non-native English writers in particular can learn patterns over time instead of accepting fixes blindly.
• Team controls on Pro: Pro includes a style guide, a brand tone, snippets and team analytics. Small teams can keep wording consistent without buying an enterprise contract or a separate brand tool.
• Established security record: The plans page cites SOC 2 Type 2 certification, and Enterprise adds SAML SSO, SCIM, audit logs and data loss prevention. Security reviewers have recognised standards to check against.

Cons

Billing terms are the catch with Grammarly, because the official $12 Pro price is shown without stating the billing cycle, and one directory reports $30 for monthly billing.

• Unclear monthly cost: The plans page shows $12 a month but does not say whether it assumes annual payment. Toolify reports $30 on monthly billing, so check the checkout screen before committing.
• Generic rewrites: AI rewrites can flatten a distinctive voice into safe, uniform prose. Writers with a strong personal style should accept changes selectively and turn off categories they dislike.
• English-centred: Fluency help and rewrites focus on English. Teams that write regularly in other languages may need a second tool for those documents, which adds cost and switching.
• Imperfect detectors: The AI detector and plagiarism checker give estimates, not proof. Teachers and editors should treat a flag as a reason to look closer rather than as a verdict on someone’s work.
• Product sprawl: Grammarly now sits inside a wider Superhuman suite with Docs, agents and Superhuman Go. New users may find it unclear which features belong to which app and plan.

Who is Using Grammarly?

Individual writers and large companies both rely on Grammarly, and its homepage names Zoom, Databricks, Atlassian and Salesforce among the organisations it serves.

• Professionals: Office workers use it for email, reports and chat messages. It helps them sound clear and courteous without spending time rereading every message.
• Students: Students use it to proofread essays and check citations. Agents such as AI Grader give rubric-based feedback before they hand work in.
• Businesses and teams: Companies use style guides, brand tone and snippets to keep communication consistent. Admins manage seats, roles and analytics centrally.
• Universities: Institutions such as the University of Pennsylvania and Arizona State University appear on its homepage. They offer it to students and staff as a writing support tool.

Pricing

Grammarly has a free plan, a Pro plan at $12 a month with a 7-day free trial, and custom Enterprise pricing (official plans page, October 2026).

Directories disagree on the details: Toolify lists Pro at $12 billed annually or $30 billed monthly, while Futurepedia still shows older Premium and Business plans at $12.08 and $12.50.

Disclaimer: Grammarly has changed plan names and bundles several times, so confirm the billing cycle and total on its checkout page.

What Makes Grammarly Unique?

Coverage is the concrete differentiator: Grammarly corrects and rewrites text inside browsers, desktop apps, Office, Google Docs and a phone keyboard from one account. Most AI writers ask you to paste text into their own editor, while Grammarly works where the text already lives.

Its explanations and long track record also set it apart. Rather than only producing a polished version, it shows why a change helps, and it now pairs that proofreading core with agents for grading, citations, reader reactions and AI detection. The link to the wider Superhuman suite may extend it further into email and workflow tasks over time.

Compatibilities and Integrations

Browser extensions for Chrome, Safari, Firefox and Edge are the main entry point, backed by desktop and mobile apps that share one account.

• Browsers: Extensions run in Chrome, Safari, Firefox and Edge. They work on most web text fields, including webmail and social sites.
• Desktop: Apps for Windows and Mac add suggestions inside many desktop programs. This covers writing outside the browser.
• Mobile: iPhone, iPad and Android apps provide a keyboard with corrections. Suggestions appear as you type in any app.
• Documents: Grammarly integrates with Microsoft Office and Google Docs. Grammarly Docs at app.grammarly.com hosts the AI agents.
• Enterprise systems: Enterprise supports SAML SSO, SCIM provisioning and an audit logs API. Administrators can control which apps and domains it runs on.

Grammarly Tutorials

Setup takes a few minutes: create an account, add the extension or app, and suggestions start appearing the next time you type.

1. Sign up at grammarly.com with an email, Google or Apple account.
2. Install the browser extension, then the desktop app or mobile keyboard if you need them.
3. Set your language variety, such as British English, and your writing goals.
4. Write as usual and click underlined text to review each suggestion.
5. Use the prompt box to rewrite, shorten or change the tone of a passage.
6. Open Grammarly Docs to try agents such as Citation Finder or Reader Reactions.

How We Rated It

Broad app coverage and dependable proofreading put Grammarly at 4.2 out of 5, while unclear billing terms and limited free customisation pull the score down.

Summary

Grammarly is a strong choice for anyone who writes in English across many apps and wants corrections in place rather than in a separate editor. The free plan covers everyday proofreading, while Pro adds rewrites, tone control, plagiarism checks and team style tools. Its main weakness is pricing clarity, since the headline Pro figure does not state the billing cycle. Students should check their institution’s rules on AI assistance, because rewrite and generation features may count as outside help. Try the 7-day Pro trial on your real email and documents before deciding whether rewrites suit your voice.