Having a responsive design is essential and usually covers most of the needs of mobile users. The advantage is that anyone can access it from their browser without having to install an app, which facilitates participation and reduces barriers to entry. However, a dedicated app can offer additional features, push notifications, and a more fluid experience, especially for highly active communities. In my forum, I noticed that casual users are satisfied with a responsive design, while more engaged members value an app because it allows them to interact more quickly and receive immediate alerts. In conclusion, a well-optimized responsive design is sufficient for most users, but if your community is growing and seeks constant interaction, considering an app can improve the experience and build member loyalty.