Grammarly AI

What it is

Grammarly is an AI writing assistant that checks grammar, spelling, punctuation, clarity and tone as you write, and offers generative AI to draft, rewrite and reply. It works across browsers, desktop apps, email clients and many websites, so suggestions appear wherever you type. Grammarly is now part of the Superhuman platform: the site footer reads "Superhuman Platform", and its enterprise offering is sold through Superhuman Go.

Key features

According to Grammarly's official plans page (October 2026):

• Proofreading: grammar, spelling and punctuation corrections on all plans.
• Tone detection to see how your writing sounds, and on Pro, tone adjustment.
• Full-sentence rewrites and fluency suggestions on Pro.
• Generative AI prompts: 100 per month on Free, 2,000 per member per month on Pro, unlimited on Enterprise.
• Plagiarism checking and AI-generated text detection on Pro.
• Brand tones and team features for organisations.
• AI agents: Grammarly promotes "proactive AI that works everywhere" alongside its writing tools.

Pricing (verified October 2026)

• Free: $0, with core proofreading, tone detection and 100 AI prompts per month.
• Pro: shown as $12 per member/month in USD. The page data indicates this price applies to annual billing (US$144/year); monthly billing costs more, so check the official site for current pricing in your billing period. A 7-day free trial is offered, with an email reminder two days before it ends.
• Enterprise: through Superhuman Go, with unlimited prompts, enterprise key management (BYOK) and enterprise-grade privacy and security. Pricing on request.

Grammarly's FAQ explains that Pro replaced the former Premium plan and includes Premium's advanced writing features plus team features previously reserved for the Business plan. Premium subscribers who switch receive a prorated refund. Annual business purchases of 10 or more members can be invoiced.

Free or Pro?

If you mainly want typo and grammar corrections in email and documents, the Free plan covers that. Pro makes sense when you regularly need whole sentences rewritten for clarity or tone, write enough with AI to exceed 100 prompts a month, or need plagiarism checks on longer documents. The 7-day trial is a sensible way to see whether the extra suggestions change your writing enough to justify the cost.

Who it's for

• Professionals writing many emails, reports and proposals.
• Non-native English writers who want clear, confident English.
• Students checking grammar and citations (subject to their institution's AI policy).
• Teams that want a consistent brand tone across documents.

Pros

• Works almost everywhere you write, through extensions and apps.
• A useful free tier for everyday proofreading.
• Pro combines editing, generative AI, plagiarism checks and AI detection.
• SOC 2 (Type 2) report and enterprise security options.
• Particularly helpful for second-language English writers.

Cons

• Monthly billing costs considerably more than the advertised annual rate.
• Suggestions can flatten personal voice if accepted automatically.
• AI-text detectors, including Grammarly's, are not definitive proof of AI use.
• Primarily focused on English.
• Sending text to a cloud service may conflict with strict confidentiality rules; check your organisation's policy.

Using Grammarly well

Treat suggestions as options rather than orders. Read each change for meaning, especially in technical or legal writing, and set your goals (audience, formality, intent) so tone suggestions fit the context. If you are a student, check whether generative features are allowed before using them on assessed work.

Alternatives on AIMAPER

• ChatGPT and Claude: flexible rewriting and feedback through chat.
• Microsoft Copilot: writing help inside Word and Outlook.
• Jasper: brand-focused content generation for marketing teams.

Compare more in our best AI writing tools category.

Bottom line

Grammarly remains one of the most practical writing assistants because it meets you wherever you type. The free plan covers basic proofreading; Pro is worth considering if you need rewrites, tone control and plagiarism checks. Compare annual and monthly prices before committing.