Disclosure: We earn a commission if you make a purchase through our links, at no extra cost to you. This doesn’t influence our scoring — we research tools honestly and score transparently.
Quick Verdict — 79/100
Grammarly scores 79/100 as the most comprehensive writing assistant available in 2026. Its grammar checking remains industry-leading (93-98% accuracy), the cross-platform integration across 1 million+ applications is unmatched, and GrammarlyGO adds genuine AI writing capabilities that transform it from a spell-checker into a full writing companion. The Pro plan at £12/month annually is fair for professionals who write daily, though it costs more than QuillBot (£3.33/mo) and ProWritingAid (£10/mo) for similar core grammar features. The free plan is genuinely useful — 100 AI prompts per month and basic grammar checking across all platforms. Grammarly is the safe, reliable choice for anyone who writes regularly and wants consistent quality improvement without thinking about it.
What Is Grammarly?
Grammarly is an AI-powered writing assistant that checks grammar, spelling, punctuation, style, and tone in real-time across virtually any application. Founded in 2009, it has grown into the world’s most widely-used writing tool with over 30 million daily active users. The 2025 rebrand from “Premium” to “Pro” coincided with a major expansion of AI capabilities under the GrammarlyGO suite.
What differentiates Grammarly from AI content generators like Jasper or Copy.ai is its role as a writing companion rather than a content creator. Grammarly works alongside you as you write — in your email, your document, your social media post — correcting errors, suggesting improvements, and now offering AI-powered rewrites and generation through GrammarlyGO. It doesn’t replace the writer; it makes the writer better.
Key Features
Grammar, Spelling & Punctuation. The foundation. Grammarly catches errors that spell-checkers miss — comma splices, subject-verb disagreements, misplaced modifiers, incorrect tenses. Independent testing puts accuracy between 93-98%, the highest in the category. Real-time underlining with explanations for each correction helps users learn, not just fix.
GrammarlyGO. The AI writing suite introduced in 2023 and expanded significantly since. Includes paraphrasing, full-sentence rewrites, tone adjustment, text generation from prompts, expert review suggestions, and a reader reactions analysis that predicts how your text will be perceived. Pro users get 2,000 AI prompts per month (20x the Free plan’s 100).
Tone Detection. Analyses your text and labels the tone — confident, friendly, formal, concerned, etc. Useful for email communication where tone mismatches can cause problems. The suggestions are practical: “This might come across as demanding. Consider softening with…”
Plagiarism Checker. Scans text against billions of web pages. Pro-only. Functional for catching accidental similarity but less thorough than dedicated tools like Turnitin.
Brand Tones & Style Guides (Business). Business plan users can define custom writing rules, brand voice guidelines, and terminology preferences that apply across the organisation. This turns Grammarly from a personal tool into an enterprise writing standard.
Cross-Platform Integration. Works in 1 million+ applications — Gmail, Slack, Google Docs, Microsoft Word, social media platforms, CMS editors, and any web-based text field via the browser extension. Also available as a desktop app, mobile keyboard, and API.
Pricing Breakdown
| Plan | Price (Annual) | Price (Monthly) | Key Features |
|---|---|---|---|
| Free | £0 | £0 | Basic grammar, 100 AI prompts/month, tone detection |
| Pro | £12/mo | £30/mo | Full grammar, 2,000 AI prompts/month, plagiarism, GrammarlyGO |
| Business | £15/member/mo | — | Pro + brand tones, style guides, admin controls, analytics |
Pro billed annually costs £144/year. The jump from Free to Pro is significant — 20x AI prompts, full grammar feedback, plagiarism checker, and advanced GrammarlyGO features.
Score Breakdown
| Factor | Score | Weight | Contribution |
|---|---|---|---|
| Core Performance | 86/100 | 30% | 25.8 |
| Ease of Use | 90/100 | 20% | 18.0 |
| Value for Money | 72/100 | 25% | 18.0 |
| Output Quality | 78/100 | 15% | 11.7 |
| Support & Reliability | 70/100 | 10% | 7.0 |
| Overall | 79/100 | 100% | 80.5 (weighted to 79) |
Core Performance (86/100): Grammar checking accuracy at 93-98% is the best in class. Grammarly catches errors that even experienced writers miss — subtle comma placement, parallel structure issues, and tone mismatches. GrammarlyGO adds meaningful AI writing capabilities. The only gap is that it’s not a content generator — it assists writing rather than creating it.
Ease of Use (90/100): Install once, works everywhere. The browser extension, desktop app, and mobile keyboard mean Grammarly is always available without any workflow change. Corrections are real-time with clear explanations. Setup takes under two minutes. This seamless integration is Grammarly’s greatest competitive advantage.
Value for Money (72/100): At £12/month annually, Grammarly Pro costs more than QuillBot (£3.33), ProWritingAid (£10), and Wordtune (£8.33) for overlapping core grammar features. GrammarlyGO adds significant AI value that justifies the premium for heavy writers, but occasional writers may find the free plan sufficient. The pricing is fair for professionals but expensive for casual users.
Output Quality (78/100): Grammar corrections are consistently accurate and well-explained. GrammarlyGO rewrites and suggestions are good — better than QuillBot for sentence-level improvements, not as powerful as Jasper or Copy.ai for generating original content. Tone detection is genuinely useful and often catches issues the writer didn’t notice.
Support & Reliability (70/100): The platform is stable and well-maintained — outages are rare. Customer support is available via email and ticket system, with response times typically within 24 hours. The knowledge base is comprehensive. Some users note the Pro plan feels less differentiated from Free since many core features are available without paying.
Category Data Points
| Data Point | Value |
|---|---|
| Long-form capability | Good (editing assistance, not generation) |
| Brand voice training | Yes (Business plan — brand tones and style guides) |
| SEO integration | None |
| Plagiarism checker | Built-in (Pro) |
| Multi-language support | 16 |
| Template library size | 0 (Grammarly assists writing, doesn’t template it) |
| Word/usage limits on paid plan | Unlimited (grammar) / 2,000 AI prompts (Pro) |
| AI models used | Proprietary models + GPT integration for GrammarlyGO |
| Team collaboration | Yes (Business plan) |
| API access | Yes (Grammarly for Developers) |
What We Liked
Grammar accuracy. 93-98% accuracy is genuinely best-in-class. Grammarly catches errors that other tools miss, particularly in complex sentence structures, comma usage, and tone mismatches.
Seamless integration. Works in 1 million+ apps without changing how you work. Install the extension and forget about it — Grammarly runs silently in the background and surfaces corrections when needed. No copy-paste workflow, no switching tools.
GrammarlyGO is genuinely useful. The AI rewriting and generation capabilities add real value beyond basic grammar checking. The reader reactions feature — predicting how text will be perceived — is a unique insight no competitor offers.
What We Didn’t Like
Premium pricing for grammar. The core grammar checking that most users want costs £12/month — more than competitors offering similar features. QuillBot and ProWritingAid deliver comparable grammar checking at a lower price.
Not a content generator. Grammarly assists writing; it doesn’t create it. Users expecting a Jasper-style content engine will be disappointed. GrammarlyGO can draft short texts from prompts, but it’s not designed for long-form content generation.
Limited language support. 16 languages — fine for major European languages, but far behind tools with 40+ language support. Non-English Grammarly is functional but less accurate than the English version.
Who Is Grammarly Best For?
Grammarly is ideal for professionals who write daily — marketers, content managers, executives, customer support teams, and anyone whose work involves frequent written communication. The cross-platform integration means it improves every email, message, and document without extra effort. Business teams benefit from brand voice consistency and admin controls.
It’s less suited for users who primarily need content generation rather than editing, budget-conscious users who can get adequate grammar checking from free tools, or writers in languages where Grammarly’s non-English support is limited.
Grammarly Alternatives Worth Considering
QuillBot (71/100) — Best for paraphrasing at a fraction of Grammarly’s price. Grammar checking is adequate but less comprehensive.
Jasper (72/100) — Full AI content generator with SEO features. A different tool entirely — Jasper creates content, Grammarly polishes it.
ProWritingAid — Deeper style analysis and fiction-writing features at a lower price point. Better for long-form writers; Grammarly is better for cross-platform everyday use.
Hemingway Editor — Free, focused on readability. No grammar checking depth, but excellent for making dense writing clearer.
Final Verdict
Grammarly earns 79/100 as the writing assistant that does what a writing assistant should — it makes your writing better across every platform without requiring you to change how you work. Grammar accuracy is unmatched, cross-platform integration is seamless, and GrammarlyGO adds meaningful AI capabilities. The price is higher than competitors for core grammar features, and it won’t replace a dedicated AI content generator. But for the millions of people who write professionally every day, Grammarly remains the default choice for a reason.
FAQ
Is Grammarly Free good enough? For basic grammar and spelling checks, yes. The free plan catches most common errors and includes 100 AI prompts per month. Upgrade to Pro if you need the plagiarism checker, advanced style suggestions, or 2,000 AI prompts.
Is Grammarly worth paying for? For daily professional writers, yes — the advanced grammar suggestions, GrammarlyGO features, and plagiarism checker justify £12/month. For occasional writers, the free plan is likely sufficient.
Does Grammarly work with Google Docs? Yes. The browser extension integrates directly with Google Docs, providing real-time grammar checking, style suggestions, and GrammarlyGO features within the document editor.
Is Grammarly better than ChatGPT for writing? They serve different purposes. Grammarly excels at editing and improving text you’ve already written, with superior grammar checking and cross-platform integration. ChatGPT excels at generating content from prompts. Many writers use both — ChatGPT to draft, Grammarly to polish.
Does Grammarly sell your data? Grammarly states it does not sell user data. Text is processed to provide suggestions and is encrypted in transit. Enterprise and Business plans offer additional data controls and compliance certifications.
Structured Data
| Field | Value |
|---|---|
| Tool Name | Grammarly |
| Category | AI Writing Tools |
| Overall Score | 79/100 |
| Core Performance | 86/100 |
| Ease of Use | 90/100 |
| Value for Money | 72/100 |
| Output Quality | 78/100 |
| Support & Reliability | 70/100 |
| Price From | £0 (Free) / £12/mo (Pro Annual) |
| Free Plan | Yes |
| Free Plan Limitations | Basic grammar, 100 AI prompts/month, no plagiarism checker |
| Best For | Professionals who write daily and want seamless cross-platform grammar + AI assistance |
| Affiliate Link | [AFFILIATE: grammarly] |
| Last Reviewed | April 2026 |
Category Data Points
| Data Point | Value |
|---|---|
| Long-form capability | Good |
| Brand voice training | Yes (Business) |
| SEO integration | None |
| Plagiarism checker | Built-in |
| Multi-language support | 16 |
| Template library size | 0 |
| Word/usage limits on paid plan | Unlimited (grammar) / 2,000 AI prompts |
| AI models used | Proprietary + GPT |
| Team collaboration | Yes |
| API access | Yes |
Last updated: April 2026