Grammarly
AI-powered writing assistant for clear, professional communication across 1 million+ apps
Grammarly is an AI writing assistant that catches grammar, spelling, and punctuation errors in real-time whilst providing tone detection, clarity suggestions, and AI-powered rewrites. Available as a free plan with basic corrections or Pro tier offering advanced features including plagiarism detection, AI text detection, and 2,000 monthly AI prompts for individuals and teams up to 149 members.
How we scored it
Six-factor weighted score. Each dimension scored 0–10 by our editorial team across testing periods of 3–18 months. No vendor influence.
What it actually costs
Intro pricing shown — see the renewal note for what you'll pay after the introductory term. We don't hide the second-act price.
The real cost
What you'll actually pay across 4 years, including the renewal cliff. We blend the math so you see the true monthly cost.
When the bill actually arrives
Most hosts advertise intro pricing prominently and renewal pricing in the fine print. Here\'s the trajectory drawn to scale.
Grammarly against the field
The highest-scoring alternatives in the same category, compared on the figures we hold for all of them.
| GrammarlyThis page | Claude | ChatGPT | |
|---|---|---|---|
| ReviewCost score | 8.3/10 | 8.4/10 | 8.3/10 |
| Cheapest plan | Free | — | — |
| From | — | — | — |
| Renews at | Not published | Not published | Not published |
| Biggest strength | Real-time detection across 400+ grammar and spelling rule types with multi-language support | Superior reasoning and complex multi-step problem-solving compared to competitors; excels at code review and architecture work | Breadth of capabilities: text, code, images, voice, web browsing, file analysis, and agentic task execution in one interface |
| Biggest drawback | 150% price markup for month-to-month billing ($30) vs annual ($12/month); surprise auto-renewal charges when free trial lapses without cancellation | No image generation or video creation capability; limited to text and vision understanding only | Free and Go tiers now include ads in US and EU markets; conversation data used for training by default (manual opt-out required) |
Prices are the published figures at the time of writing and change often. Renewal pricing is shown where the vendor publishes it. See how we review.
What people ask about Grammarly
Straight answers to what buyers actually ask, drawn from the documentation and published user reports.