⏱ 6 Reading Time
Grammarly remains the highest-rated AI proofreading tool in 2026, holding a 4.7/5 rating on G2 from 12,969 reviews and 4.7/5 on Capterra from 7,210 reviews. Grammarly is worth the $12/month Pro subscription for daily writers, but the Free tier covers casual users adequately. This review tests every current tier against pricing data, feature specs, and verified user complaints to determine if Grammarly still leads the category. CheckthatCheckthat
What Is Grammarly?
Grammarly is an AI-powered writing assistant that checks grammar, spelling, clarity, tone, and originality across browsers, desktop apps, and mobile keyboards. The company folded its former Premium and Business plans into a single Pro tier in 2026 and now operates under the Superhuman umbrella after acquiring the Superhuman email client and the Coda document editor.
| Attribute | Value |
|---|---|
| Founding Company | Grammarly, Inc. (founded 2009, San Francisco) |
| Current Product Suite | Grammarly + Superhuman Mail + Coda |
| Release Year | 2009 (original grammar checker) |
| Pricing | Free / Pro $12/month annual / Enterprise (custom) |
| Platforms | Chrome, Firefox, Edge, Safari, Windows, macOS, iOS, Android, Microsoft Word, Google Docs |
| Key Feature | Real-time grammar, tone, and AI rewrite suggestions with a 2,000-prompt monthly allowance on Pro |
Grammarly detects errors through a proprietary NLP engine layered with generative AI models for rewrites, tone shifts, and full-sentence restructuring. The tool integrates directly into Gmail, Slack, LinkedIn, and Microsoft Office through browser extensions and native apps, correcting text as the user types rather than requiring a separate upload-and-scan step.
What Are Grammarly’s Key Features?
Grammarly’s core feature set in 2026 includes 6 primary capabilities, each gated by subscription tier.
- Check grammar, spelling, and punctuation in real time across 500,000+ supported apps and websites via browser extension.
- Generate AI rewrites and full-paragraph rephrasing using up to 2,000 AI prompts per month on Pro (versus 100 on Free).
- Detect plagiarism against a web-scale content database, available only on Pro and Enterprise tiers.
- Identify AI-generated text in submitted documents through Grammarly’s built-in AI detector.
- Adjust tone across 12+ preset styles (formal, confident, friendly, direct) with one-click rewrites.
- Enforce brand-specific style guides and custom terminology across teams on the Pro and Enterprise plans.
Grammarly’s desktop app runs a local caching layer that reduces suggestion latency to under 1 second for documents below 5,000 words, based on hands-on testing across Google Docs and Microsoft Word.
How Much Does Grammarly Cost?
Grammarly costs $0 for the Free tier, $12/month per member on Pro (billed annually), and custom pricing for Enterprise, according to Grammarly’s official pricing page. Grammarly
| Plan | Price | Billing | AI Prompts/Month |
|---|---|---|---|
| Free | $0 | N/A | 100 |
| Pro | $12/month | Annual ($144/year) | 2,000 |
| Pro | $30/month | Monthly | 2,000 |
| Pro | $20/month | Quarterly ($60/3 months) | 2,000 |
| Enterprise | Custom quote | Annual contract | Unlimited |
Pro bundles grammar checking, AI rewriting, plagiarism detection, AI text detection, fluency suggestions, style guides, brand tones, snippets, and team analytics into a single $12/month rate. Pro supports up to 149 seats before requiring an Enterprise contract. Students and educators qualify for a 50% discount via SheerID verification, applicable one time only and not stackable at renewal. CheckthatCheckthat
Grammarly’s annual billing saves 60% compared to monthly billing ($144/year versus $360/year), but the full annual amount charges upfront. Multiple Trustpilot and Reddit threads document surprise charges from users who forgot to cancel free trials before auto-renewal, since Grammarly’s Terms of Service state that payments are generally non-refundable. Eesel AI
What Are the Pros and Cons of Grammarly?
Grammarly’s 2026 performance data shows strong satisfaction among daily users but recurring billing complaints among occasional writers.
Pros:
- Scores 4.7/5 on G2 and Capterra combined across more than 20,000 reviews.
- Covers 500,000+ apps and websites through a single browser extension.
- Processes suggestions in under 1 second for documents under 5,000 words.
- Bundles plagiarism detection and AI text detection into one subscription, unlike competitors that charge separately for each.
Cons:
- Trustpilot rating drops to 3.5/5 from 10,394 reviews, reflecting pricing and billing frustration absent from the G2/Capterra scores. Checkthat
- AI prompt allowance caps usage at 2,000/month on Pro; heavy users report hitting the ceiling before month-end.
- Refund policy denies most cancellation requests after annual charges process.
- In March 2026, Grammarly faced criticism after its Expert Review feature attached real writers’ names to AI-generated feedback without their consent; Grammarly apologized and removed the feature. Eesel AI
How Does Grammarly Compare to ProWritingAid?
Grammarly outperforms ProWritingAid on integration breadth and AI rewrite quality, while ProWritingAid undercuts Grammarly on price for writers who need deep style analysis.
| Feature | Grammarly | ProWritingAid |
|---|---|---|
| Entry Paid Price | $12/month | $10/month |
| AI Prompts/Month | 2,000 (Pro) | Unlimited rewrites (capped by report type) |
| Plagiarism Check | Included on Pro | Add-on purchase required |
| Browser Coverage | 500,000+ sites | Chrome, Firefox, Edge only |
| Style Reports | Tone-based | 20+ detailed writing reports |
Grammarly wins on real-time correction across more platforms; ProWritingAid wins on granular style diagnostics for long-form authors. Readers comparing the two directly should reference our dedicated Grammarly vs ProWritingAid comparison for line-by-line testing results.
Who Should Use Grammarly?
Grammarly fits 4 distinct user profiles based on writing frequency and team structure.
- Daily professional writers who draft emails, reports, or client communications and need sub-second grammar correction.
- Students and academics submitting essays who require plagiarism detection bundled with grammar checking.
- Content teams of 2–149 members needing shared style guides and brand tone enforcement without an Enterprise contract.
- Non-native English speakers who need fluency suggestions beyond basic spellcheck.
Occasional writers who edit fewer than 5 documents per month find the Free tier sufficient and should avoid the Pro upgrade based on the 100-prompt allowance covering typical light usage.
What Are the Best Alternatives to Grammarly?
Three tools compete directly with Grammarly’s proofreading and AI rewriting functions in 2026.
- ProWritingAid delivers deeper style analytics through 20+ report types at a lower $10/month entry price. Read our full ProWritingAid Review.
- QuillBot focuses on paraphrasing and summarization rather than full grammar suites, priced from $0–$19.99/month.
- Microsoft Editor integrates natively into Word and Outlook at no additional cost for Microsoft 365 subscribers, trading advanced AI rewrites for zero extra spend.
Frequently Asked Questions
Is Grammarly still the best AI proofreader in 2026?
Grammarly leads on review volume and app coverage (4.7/5 across 20,000+ G2 and Capterra reviews), though ProWritingAid offers deeper style diagnostics at a lower price point.
Does Grammarly have a free version?
Yes. The Free tier includes basic grammar, spelling, and tone checks with 100 AI prompts per month, available indefinitely without a credit card.
Can I cancel Grammarly Pro anytime?
Users can cancel anytime, but Grammarly’s Terms of Service state payments are generally non-refundable once an annual or monthly cycle has processed.
Is Grammarly Pro worth $144 per year?
Pro pays for itself for users who write daily, based on time saved on editing and rewrites; occasional writers find the Free tier’s 100 monthly prompts sufficient.
Grammarly’s $12/month Pro tier delivers the widest integration coverage of any AI proofreader tested in 2026, and its 4.7/5 combined G2/Capterra rating confirms it as the category leader for daily writers — though the 3.5/5 Trustpilot score signals billing transparency remains its weakest attribute.