Grammarly

Grammarly has a free plan at $0 a month, which covers basic mistake checking, a read on your writing tone and 100 AI prompts for generating text.

That is enough to see whether the tool fits how you write.

Grammarly is an AI writing assistant and grammar checker that corrects grammar, style and tone as you write.

The Pro plan costs $12 per member per month when billed annually, or $30 when billed monthly, so the annual route is the much cheaper one.

It includes everything in Free and adds full sentence rewrites, tone adjustment, a way to stay on-brand and 2,000 AI prompts.

Enterprise pricing goes through sales.

It includes everything in Pro, plus unlimited members, dedicated support, confidential mode, granular roles and permissions, data loss prevention and unlimited generative AI prompts.

Those extras matter mostly to larger organizations with compliance concerns.

Individual writers will likely find the free tier or Pro plan enough, and the 100-prompt cap on Free is the first limit you would hit.