Grammarly is the writing assistant that lives everywhere you type – browser, docs, email and desktop apps – catching grammar, spelling and tone issues in real time. In 2026 the old Premium and Business tiers were folded into a single Pro plan with a shared style guide for up to 149 members.
The free tier includes full grammar checking plus 100 AI prompts per month; Pro at $12/month on annual billing raises that to 2,000 prompts and unlocks full rewrites, plagiarism and AI-text detection. Month-to-month billing costs $30, so annual is the sensible choice.