Nutrition Calculator — Macro Tracking & Circadian Rhythm Mobile App

Duration: 6 Weeks

Client: Greenworks Productions S.R.L.

Category: Mobile App

Platform: Android

Here to Know About This Project

Nutrition Calculator is an Android app that helps users calculate nutritional values for custom meals (e.g., number of eggs or grams of avocado) and tracks their personal daily macro score (fat, carbs, protein). It also visualises a 24-hour metabolic clock tied to circadian rhythms. play.google.com+1
The client wanted a redesign to enhance user experience, improve performance across devices, and expand the user base beyond the existing 5K + installs. play.google.com

The Challenge of the Project

Key challenges for this project included:

Ensuring fast, responsive calculations of nutrition values for custom user entries (varying quantities, food items) without lag or inconsistent results.
Supporting the unique “metabolic clock” feature (visualising circadian rhythm data) in a way that’s intuitive and meaningful to end users.
Designing for a broad range of Android devices (from low-spec to high-end) in a health app context that needs reliability and accuracy.
Encouraging daily engagement in a health-tracking context where user drop-off is common.

Our Solution & Approach

We began with a user flow audit — analysing how users added foods, viewed their macro summary, and interacted with the circadian clock. From that, our team redesigned both UI/UX and underlying architecture:

Implemented a responsive UI where custom food entries and macro calculations happen in under a second, with feedback animations and clear visual results.
Re-engineered the “metabolic clock” visualization to reflect time-of-day intuitively (eating, rest, work zones) and made it interactive so users understand when different bodily processes are active.
Built an optimized data engine: a local database + calculation module ensuring offline capability and fast response even on mid-tier devices.
Developed onboarding and short-session flows to encourage repeated daily use (quick food entry, immediate summary, visual feedback) to increase retention.

Key Deliverables & Implementations

Result & Impact

The redesigned Nutrition Calculator app now delivers a smoother, faster nutrition-tracking experience. Users can create custom meals, immediately see their macro breakdown, and interpret their daily metabolic rhythm simply through the clock UI. The internal architecture is now more maintainable and scalable, setting a foundation for future features like meal export, advanced nutrient metrics or subscription-based premium content.