Plan Your Task Easily and Task Your Plan Instantly
Denno is a task management mobile application for people who need a faster way to plan work, track priorities, and keep daily progress visible. In this mobile app UX design case study, Heeeper shaped the product experience for iOS and Android around clarity, speed, and stress-free task planning.
Challenge:
Most task management tools are either too limited for real workflows or too heavy for everyday planning. Denno needed a mobile UX that could support personal productivity and team coordination without making users learn a complex project management system.
What We Did:
We designed a lightweight product experience with clear task creation, priority states, progress tracking, and mobile-first navigation. The result is a clean task management app UI that helps users capture work quickly and stay focused across iOS and Android.
3,500 +
Daily number of users
150K +
Seed investments
$1,5M +
Profit margin
The app interface was designed for iOS and Android users with a simple visual hierarchy, clear task states, and fast access to daily planning flows. Every screen supports the core goal: helping users understand what to do next.
We moved from product logic and user flows to high-fidelity mobile UI design, testing how quickly users could scan priorities, deadlines, and task details. Close collaboration with the client kept the UX design process focused on real workflows instead of decorative screens.
To keep the product consistent as new features are added, we created a mobile app design system with colors, typography, UI patterns, and reusable visual rules for Denno's task management experience.
“The attention to detail, creativity, and professionalism were truly remarkable. Their ability to translate ideas into a flawless design was unparalleled.”
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