Grammarly

Overview

Grammarly has evolved from grammar checker into a full writing assistant with a clear marketing angle: make every piece of customer-facing text clean and on-brand. For marketers it's the quality-control layer — catching typos in subject lines, softening or sharpening tone, flagging passive voice, and enforcing shared style guides across the team. The browser extension covers everything you write in Gmail, HubSpot, social tools, and Google Docs, so polished copy happens automatically rather than in a separate editor. Brand tones and style guides make it especially valuable for teams where many people touch customer-facing words.

Our take: Grammarly is the least glamorous tool in this list and arguably the most relied-upon. In testing, its real value isn't generation — it's the safety net that catches the embarrassing error right before publish. The tone detector is smart, and the team style-guide feature quietly prevents the brand-voice drift that hurts consistency. The catch: it's a layer on top of your stack, not a content engine. Pair it with a generator rather than replacing one.

Best for

Marketing teams that need a consistent quality and tone layer across every channel, especially email-heavy and social-heavy workflows.

Key features

• Browser extension polishes copy across Gmail, Docs, and social tools
• Tone detection and adjustment to hit brand voice
• Shared style guide and brand tone enforcement for teams
• Plagiarism check for published content
• Generative AI for rewriting and expanding sentences in context

Use cases for marketers

• Proofreading email campaigns before send
• Enforcing tone across social media managers' drafts
• Keeping blog and ad copy consistent with style guides
• Checking published content for plagiarism

Pricing

FAQ

Alternatives

• Wordtune
• QuillBot
• Writesonic