I've used Grammarly for three years across five different jobs, and it's caught everything from misplaced commas in investor emails to accidentally hostile tone in Slack messages to my own team. It's one of those rare tools that's both invisible enough to never disrupt your workflow and assertive enough to save you from genuinely embarrassing mistakes. The question isn't whether Grammarly works—it's whether you write enough to justify the premium price.
Grammarly Premium is worth it for professionals whose writing directly affects business outcomes—marketers, executives, client-facing roles, or anyone building a personal brand. Casual writers should stick with the excellent free tier. Skip it entirely only if you're a creative writer who'll find the constant suggestions creatively stifling, or you genuinely write so infrequently that even $12/month feels wasteful.