Justinmind

Justinmind is a desktop prototyping and UI design tool for web and mobile apps. It supports the design cycle from low-fidelity wireframes through high-fidelity prototypes to interactive simulations, helping teams validate designs early and reduce rework before development.

Its capabilities include visual design with vector tools, adaptive layouts, templates and masters, pre-built UI kits, and rich interactions with web triggers, mobile gestures, animations, conditions and variables. Forms, data lists and data grids can be prototyped with functional fields, validation and business logic rules, using imported data. Collaboration features include shared feedback, co-editing, version control and developer handoff with access to dimensions, assets and CSS. Design systems support synchronized UI kits and user management. Requirements can be captured, versioned and linked to components, with integrations for JIRA and Azure DevOps Boards. Export options include interactive HTML+JS, MS Word and PDF specification documents, and image files, with an API and SDK for custom integrations. Prototypes can be tested in a browser, on real devices via an app, or through user testing integrations.

Justinmind is available for macOS and Windows, with a free version that includes UI design features and unlimited projects. Paid editions and team plans are offered, with user management for repositories, permissions and roles.