Azure DevOps (Boards+Repos for App Design)

Azure DevOps isn’t purely an app design tool, but it provides boards, repos, and pipelines that can help manage app design tasks, track work items, store design files, or host code. Teams can coordinate user stories, attach wireframes, and collaborate on acceptance criteria. While not a typical UI prototyping software, it’s free for small teams, offering unlimited private repos and a robust Kanban board. Designers might store mockups in repos, while dev teams integrate continuous integration. This synergy fosters a unified environment for planning, designing, and implementing apps at scale.