Grammarly

Grammarly is a long-established English writing assistant that predates the LLM boom by years. Through its browser extension and desktop apps it flags grammar, spelling and word-choice issues in real time across email, documents and chat, with suggested rewrites.

Its defining trait is being everywhere: once installed, almost any text box on the web or in office apps gets checked automatically, with no separate tool to open. In recent years it has added generative AI too, so it can rewrite a paragraph on instruction, adjust tone or draft a reply.

It is especially useful for non-native writers working on English emails and papers. But it is English only, and generative rewrites lean toward a generic business tone, so you need to decide what to accept if you want to keep your own voice.

Key features

• Grammar and spelling checks: Flags grammar, spelling and punctuation errors in real time, fixable with one click.
• Clarity and concision suggestions: Points out wordy, passive or vague sentences and suggests more direct phrasing.
• Tone detection: Gauges whether your text reads as formal, friendly or abrupt, helping you pitch the message right.
• Generative rewriting: Rewrites paragraphs, shortens long text and drafts email replies on request.
• Broad platform coverage: Browser extensions, desktop apps, office add-ins and a mobile keyboard.

How to use

1. Sign up on the Grammarly website.
2. Install the browser extension or desktop app, and add it to the office apps you use.
3. Write English as usual in any text box; underlined text marks issues it has found.
4. Click an underline to see the suggestion and accept or dismiss it; open the AI assistant for paragraph-level rewrites.
5. Set your English variety (such as American or British) and writing goals in settings so suggestions fit the context.

Best for

• Work emails in English: Catches grammar and tone problems before you hit send.
• Papers and reports: Checks consistency and clarity across long English documents.
• Job applications: CVs and cover letters, where accuracy matters.
• Everyday English communication: Corrects as you type in chat apps and social platforms.

Strengths and limitations

Strengths

• Works almost everywhere you type.
• Basic corrections are free and accurate, a clear help to non-native writers.
• Suggestions come with explanations, so long-term use improves your own English.

Limitations

• English only; no help with Chinese or other languages.
• Generative rewrites lean toward a generic business tone and can flatten your personal style.
• It reads what you type, so be mindful of privacy and compliance with sensitive content.
• Advanced rewriting and style suggestions require a subscription; the free tier is limited.