Grammarly and ProWritingAid are two popular AI grammar checkers that offer various features to improve writing quality. Both apps have extensive customization options, analysis reports, and generative AI tools to help writers refine their work. Grammarly has a cleaner interface, better stability, and more integrations with other platforms, including mobile apps. However, ProWritingAid offers more comprehensive analysis reports, better pricing options, and granular suggestions. Ultimately, the choice between the two depends on individual writing needs, with Grammarly being suitable for those who value ease of use and integration, while ProWritingAid is ideal for writers who require more rigorous feedback and analysis.