Grammarly

Pros and cons

What Grammarly actually checks

Grammarly checks more than spelling and grammar. It analyses tone (does this email sound too blunt?), clarity (is this sentence easy to read?), engagement (is the writing holding attention?), and delivery (is this appropriate for the context?). Each suggestion comes with an explanation of why the change improves the writing.

The free plan covers grammar, spelling, punctuation, and conciseness. That is genuinely useful on its own — most writing errors fall into those categories. Premium adds the tone suggestions, clarity improvements, and full sentence rewrites. Business adds the ability to share style guides and brand tone settings across an entire team, so everyone's writing follows the same rules.

Grammarly is not an AI writing assistant in the same sense as [Claude](/tools/claude) or [ChatGPT](/tools/chatgpt). It does not generate full drafts from a prompt. It checks and improves what you have already written, which is a different kind of help — and often the more useful kind, because editing your own writing is harder than generating new text.

GrammarlyGO — the generative features

GrammarlyGO is Grammarly's generative AI layer. It can rewrite a sentence in a different tone, generate a reply to an email, complete a paragraph you have started, or summarise a document. These features work inside the same interface as the grammar checker — you highlight text and choose from a menu of AI options.

The quality of GrammarlyGO's output is average. It produces grammatically correct, adequately structured text that covers the obvious points without any of the precision or voice control that [Claude](/tools/claude) delivers. For quick email replies and routine business communication, it is fast and good enough. For anything that needs to sound like a specific person or carry a specific argument, the output will need significant editing.

The practical workflow for most Grammarly users: write the draft yourself, use Grammarly to fix grammar and tone, and leave GrammarlyGO for generating quick replies and short-form text you do not care deeply about.

Where Grammarly works

Grammarly's real advantage over AI writing tools is where it runs. Install the browser extension and Grammarly works in Gmail, Outlook, LinkedIn, Twitter/X, Notion, Slack, HubSpot, and every other text field in your browser. It works in Microsoft Word and Google Docs via add-ons. It has a desktop app for writing offline. It runs inside Grammarly's own editor at app.grammarly.com.

This ubiquity is the product's core value proposition. You do not need to copy text into a chat interface and paste the corrected version back. The checks happen where you are already writing, in real time, as you type. For someone who writes in five different tools every day — email, Slack, Google Docs, a CMS, a project management tool — that integration reduces friction significantly.

[Claude](/tools/claude) and [ChatGPT](/tools/chatgpt) are more capable at actual writing and editing, but they require you to move text out of your workflow and back in. Grammarly stays in the workflow. For editing rather than generating, that is often the better trade-off. According to Grammarly's own figures, the tool has [30 million daily active users](https://www.grammarly.com/press) — a scale that reflects how many people find the in-context integration valuable enough to use every day.

The Business plan and team consistency

Grammarly Business ($15/user/month, minimum three users) adds three features that matter for teams: shared style guides, brand tone enforcement, and team analytics.

The style guide lets an admin define rules — always use Oxford commas, avoid passive voice, call the product by its exact name — and Grammarly flags violations across every team member's writing. Brand tone settings define the target tone (confident, friendly, formal) and Grammarly nudges writers toward it. Analytics show which writers follow the guide and which types of errors appear most frequently across the team.

For a marketing team of five or more people producing content regularly, this solves a real problem. Getting five writers to produce content that sounds like it comes from one brand — without a managing editor reviewing every piece — requires either strong individual discipline or a systematic approach. Grammarly Business is one of the more practical systematic approaches available. It is not a replacement for editorial judgement, but it catches the mechanical inconsistencies that slip through even when the writing is otherwise good.

Who should not use Grammarly

If you are a native English writer with strong grammar and you write in a handful of specific tools — say, Google Docs and Gmail only — the Grammarly Premium price is hard to justify at $12/month. The free grammar checker covers what most confident writers actually need, and using [Claude](/tools/claude) or [ChatGPT](/tools/chatgpt) for occasional editing achieves better results on specific pieces than Grammarly's automated suggestions do.

If your primary AI writing workflow already involves pasting drafts into Claude or ChatGPT for editing feedback, Grammarly Premium is redundant for the editing function. Those tools will give you more precise, context-aware suggestions on a single piece. Grammarly's advantage is real-time, in-context checking across every app you use — not the quality of its suggestions on any given document.

For technical writers working with specialised domain terminology — medical, legal, engineering, software documentation — Grammarly's suggestions can be actively unhelpful. It does not know that "instantiate" is correct usage in a Java context or that certain passive constructions are standard in legal writing. The suggestion engine optimises for general-purpose business prose, and that optimisation clashes with specialist registers. In those cases, the free plan for basic spell-check is enough, and the Premium suggestions are noise.