Grammarly is one of the most used grammar checkers that integrates with platforms like HubSpot through browser extensions. This allows marketers, content teams, and copywriters to maintain writing quality directly within their existing workflows without switching tools. By integrating seamlessly into content editors, email tools, and CMS platforms, Grammarly helps ensure consistency in tone, grammar, and clarity across marketing campaigns. While not all grammar tools offer direct integrations, many can still be used alongside platforms like HubSpot to support content quality, editing efficiency, and overall communication effectiveness.