Grammarly (Pro) review 2027

What problem does Grammarly solve for people editing their own drafts?

Grammarly is the editor rather than the writer. Its tagline describes it plainly: it works inside every app you already type in and makes your own writing clearer. That framing matters, because the tool is not built to fill a blank page. The verdict is direct — Grammarly is the tool to buy if the problem is your own drafts rather than a blank page, and as a generator it is the weakest here, something it does not pretend otherwise.

The benefits follow from that position. It works in Gmail, Docs, Word, Slack and the browser, so there is no copying between tools. In our rewrite brief it caught every real grammar issue our editors flagged. The free tier is genuinely useful, and the Business plan enforces a shared style guide across a team. It is still right for people who write plenty and want it tightened.

How did it score 8.4 across our five criteria?

Output quality carried the most weight at 30 points, and Grammarly took 22. Two editors blind-scored the same six briefs — a product description, a how-to intro, an email, a landing page, a technical explainer and a rewrite — for accuracy, usefulness and how much editing each needed.

Control and brand voice is worth 20 points and it earned 16, covering custom instructions, tone and style controls, brand voice training, and whether the tool stayed on brief. Workflow and integrations, also out of 20, was its strongest area at 19, measuring documents, templates, browser and app integrations, collaboration and export.

Accuracy and disclosure gave it 14 of 15, based on hallucination rate on checkable facts in our briefs, citation support, and what the vendor says about training on your data. Value added 13 of 15, judged on the monthly price for one writer producing roughly 20 pieces a month.

Where does Grammarly stand out?

The integration story is the clearest strength. Because it lives inside Gmail, Docs, Word, Slack and the browser, the editing happens where the writing already happens. Our editors also found it caught every real grammar issue they flagged in the rewrite brief, which is the core promise of an editing tool.

At $12 a month the paid tier sits below most of this category, and the free tier covers grammar and spelling rather than acting as a dead end. For teams, the Business plan enforces a shared style guide, which is the mechanism that keeps a group's output consistent.

What do you actually get?

The entry paid plan is 12 USD/mo. The free plan covers grammar and spelling. In our test it needed 5 /10 editing, lower is better. Brand voice arrives as a style guide on the Business plan, citations take the form of a plagiarism check, and templates are a prompt library. On data use, Grammarly states it does not sell or train public models on your text. The stated best use is improving writing you already did.

How does it compare with the other tools we tested?

Claude scored 8.8 at $20 and is built for long-form, technical and editorial work, with Projects holding custom instructions and reference files. It needed 3 /10 editing in our test, against Grammarly's 5 /10, and offers citations when browsing or given sources, though it has no template library. ChatGPT scored 8.7 at $20, also 3 /10 editing, with custom instructions and custom GPTs for brand voice and custom GPTs acting as templates. Jasper scored 8.0 at $69, with an entry paid plan of 39 USD/mo, 4 /10 editing, brand voices trained on your existing content, no citations and 50+ marketing templates. Notion AI scored 7.9 at $10, 5 /10 editing, using your workspace as context and linking to the workspace pages it used.

Where does Grammarly fall short?

Generation quality is where it lost. As a generative writer it scored 5, and it is an editor first. Full generative features need the paid tier, so the free plan will not cover drafting work. There is also a craft risk: suggestions can flatten a distinctive voice if accepted wholesale.

Is $12 a month good value?

The price summary is $12. In the value criterion, which weighs the monthly price for one writer producing roughly 20 pieces a month, Grammarly took 13 of 15 points. That is the highest value score among the tools compared here, and it comes with a free tier that covers grammar and spelling.

Who should buy Grammarly?

It is still right for people who write plenty and want it tightened. If your problem is your own drafts rather than a blank page, this is the tool to buy. If you need a generator to produce long-form or technical work from scratch, the rivals above scored higher on output and needed less editing.