Grammarly – AI Grammar Checker & Writing Assistant

★★★★☆ 4.7/5

Real-Time Grammar Check • 40+ Tone Modes • AI Rewriting • Plagiarism & AI Detector • 2,000 AI Prompts/mo

Free (100 AI prompts/mo); Pro €12/mo (annual, 7-day trial), €20/mo quarterly, €30/mo; Enterprise custom via Superhuman Go

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Grammarly is an AI writing assistant used by over 40 million people and 50,000 organizations — delivering real-time grammar, spelling, and style correction across virtually every application professionals use daily. Where QuillBot specializes in paraphrasing and Wordtune rewrites for fluency, Grammarly acts as a persistent in-context editor embedded directly into Gmail, Slack, Google Docs, LinkedIn, and 500,000+ apps via browser extension.

Key Features

Grammarly’s 2026 feature set extends well beyond spell-checking. The AI engine detects 40+ tones — distinguishing whether an email reads as aggressive or passive, confident or uncertain — a capability no direct competitor matches. GrammarlyGO, the generative layer, gives Pro users 2,000 AI prompts/month for in-context drafting and rewriting. Pro also adds full-sentence rewrites, AI text detection, and plagiarism checking against 16 billion web pages. The Enterprise tier adds BYOK encryption, SCIM, and data loss prevention — making it the only grammar tool that meets Fortune 500 security requirements.

Use Cases

Marketing managers use tone detection to ensure client-facing emails read as confident without sounding aggressive. Editorial leads report cutting review time by 50% after team-wide deployment. University students run the AI detector and plagiarism checker on their own submissions before handing in work. Sales professionals proofread LinkedIn outreach and cold emails via browser extension in real-time — without switching tabs or copy-pasting into a separate tool.

Pricing & Plans

Free includes grammar checking and 100 AI prompts/month. Pro costs €12/mo (annual), €20/mo (quarterly), or €30/mo (monthly) — all starting with a 7-day free trial. Enterprise is custom-priced with dedicated support and BYOK encryption. Start with Free to evaluate error detection; upgrade to Pro when you write 10+ high-stakes emails or documents per day.

Pros

Works across 500,000+ apps — Gmail, Slack, Google Docs, LinkedIn
40+ tone detection modes — unmatched by QuillBot or Wordtune
Plagiarism check scans 16 billion web pages on Pro plan
Enterprise security (BYOK, DLP, SCIM) for corporate-wide deployments

Cons

€12/mo annual (€144/year) — free version catches most basic errors
Can be overzealous with suggestions — requires judgment to filter noise
100 AI prompts/month on free tier — too low for daily generative AI use
No paraphrasing modes — QuillBot’s 8-mode rewriter wins for academic text

Our Final Verdict

Grammarly detects errors across 40+ tone categories in real-time inside every app you use — trusted by 50,000 organizations and 40 million people, Pro from €12/month annually with a 7-day free trial. Best for professionals, students, and teams who write high-stakes emails and documents daily and need an editor that works silently inside Gmail, Slack, and Google Docs without switching tools. Skip it if your primary need is paraphrasing — QuillBot at €8.33/mo is better suited for that. Compare all plans at the AI Pricing Hub.