Grammarly is an AI writing assistant that checks grammar, spelling, punctuation, clarity and tone in real time across your browser, desktop apps and mobile keyboard. In 2026 it comes in three plans, Free, Pro (formerly Premium) and Enterprise, with generative AI built in. This is our honest, hands-on verdict on what it does well, where it falls short, and who should pay for it.
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I have used Grammarly daily across emails, blog drafts and book chapters since long before AI writing tools were the norm. The product has changed a lot in two years, so this review looks at how it actually holds up today. For a wider field, see our roundup of the best grammar checkers and the closest Grammarly alternatives.
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At its core, Grammarly is an AI writing assistant that goes well beyond spell-checking into grammar, punctuation, clarity, engagement and tone. It suits anyone who writes: students, professionals drafting emails and reports, bloggers and content creators, and non-native English speakers who want clearer, more natural writing.
If you have used Grammarly for years, the company behind it has shifted. It acquired the work-doc platform Coda in December 2024 and the AI email app Superhuman in July 2025, and in October 2025 the parent company rebranded to Superhuman. The key point for this review: the Grammarly product still exists under the Grammarly name, and the writing assistant reviewed here is intact. The rename is a corporate-brand change, not a shutdown of the tool you log into.
Grammarly is best thought of as several editors in one:
Grammarly works as a desktop app for focused work, a browser extension that checks almost any text field online (Gmail, LinkedIn, Slack, Google Docs), and a mobile keyboard for iOS and Android. It also has add-ins for Microsoft Word and Outlook. This everywhere-you-type coverage is its single biggest practical strength.
The part AI summaries cannot compress is what happens when you actually run writing through the tool. We keep a short, deliberately error-seeded paragraph and put it through both Grammarly and the free grammar checker on this site. Here is the test paragraph, with the seeded problems:
Their going to the store, and me and him will definately meet you their at 5pm. Its a long drive but the affects of the traffic was worse then we expected, which we should of planned for.
| Seeded error | Type | What a good checker should do |
|---|---|---|
| ”Their going” / “meet you their” | Homophone (they’re / there) | Flag both and correct |
| ”me and him will” | Pronoun case | Suggest “he and I will" |
| "definately” | Misspelling | Correct to “definitely" |
| "Its a long drive” | Apostrophe (it’s) | Correct to “it’s" |
| "the affects of” | Word confusion (effects) | Correct to “effects" |
| "was worse” | Subject-verb agreement (effects were) | Correct to “were" |
| "worse then we expected” | Then/than | Correct to “than" |
| "should of planned” | Should have | Correct to “should have” |
Honest findings: Grammarly catches the mechanical errors here reliably, including the homophones, the apostrophe, effect/affect, then/than and “should of,” and it goes further by offering a one-click full rewrite and a tone read that the free checker does not. The free on-site checker catches the core spelling, apostrophe and word-confusion errors and keeps everything in your browser (nothing you paste is sent anywhere), which makes it a good private first pass, but it does not rewrite sentences or judge tone. If your writing needs only basic correctness, the free checker is enough; if you want rewrites, tone control and coverage everywhere you type, that is what you are paying Grammarly for. No tool caught everything on its own on every run, which is the honest case for still reading your work yourself.
Grammarly offers a genuinely useful free tier, while Pro (renamed from Premium during 2025) unlocks its full editing power. During 2025 the old Business tier was folded into Pro, so the same plan now scales from a single writer to a team, with Enterprise above it for larger organisations.
| Free | Pro | |
|---|---|---|
| Grammar, spelling, punctuation | Yes | Yes |
| Tone detection | Yes | Yes |
| Full-sentence rewrites and tone rewriting | No | Yes |
| Plagiarism and AI-text detection | No | Yes |
| Generative-AI prompts per month | 100 | 2,000 |
For the full breakdown, see our Grammarly free vs Premium comparison. Pro costs roughly $12 a month on an annual plan; pricing is geo-tested, so confirm the current figure at checkout, and check our Grammarly coupon guide before you commit.
Strengths
Limits
Grammarly earns its place for students (proofreading and plagiarism checks), professionals (flawless emails, reports and proposals), bloggers and content creators (polished, publishable drafts faster), and non-native English speakers (clearer, more natural English with explanations). If you rarely write or need only basic spell-checking, a word processor’s built-in tools may be enough.
In 2026 Grammarly remains the strongest all-round AI writing assistant we have tested. For most people who write regularly and care about the quality and correctness of their words, Grammarly Pro is worth it: it is an accelerator for your writing, a daily safety net and a first-pass editor that few tools match. It will not replace a human editor, and it should not replace your own judgement. If you are weighing options, compare it against the field in our Grammarly alternatives guide, or start free and see how far it gets you.
About this guide: Written by Bryan Collins, writer and founder of Become a Writer Today. Our recommendations are based on hands-on testing and independent research. Become a Writer Today does not accept payment for rankings or recommendations.
For anyone who writes regularly and cares about clarity and correctness, Grammarly Pro is worth it. It catches errors in real time everywhere you write, adds rewrites and tone control, and usually pays for itself in saved editing time. Casual writers are well served by the free plan. It is a first-pass editor, not a substitute for a human editor.
Grammarly offers three plans in 2026: Free, Pro (renamed from Premium in late 2024), and a custom-priced Enterprise plan for larger organisations. The old standalone Business tier has been folded into Pro, which now covers both individuals and teams.
The Free plan is free. Grammarly Pro costs roughly $12 per month on an annual plan, with higher effective rates on shorter terms. Pricing is geo-tested and changes often, so confirm the current figure at checkout. Enterprise is custom-priced.
No. Grammarly is excellent at catching mechanical errors and offering clarity and tone suggestions, but it cannot judge plot, argument, structure or voice the way a human editor can. Use it as a fast first-pass editor and safety net, then bring in a person for work that really matters.
Grammarly uses encryption in transit and at rest, is GDPR and CCPA compliant, and states it does not sell user content. Your text is sent to its servers for analysis. For highly sensitive or confidential documents, a private, on-device tool is the safer choice.
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