A cross-platform healthcare app in Flutter — patients book, track, and manage their care in one place. Launched to a 4.8★ App Store rating in under 3 months.
The Challenge
Our client's target users — patients at mid-size private hospitals in India — were still booking appointments by calling reception, getting their test results by visiting the lab in person, and managing their health records in a folder of printed papers.
The challenge wasn't just building an app. It was building an app simple enough for a 65-year-old first-time smartphone user, while powerful enough to handle complex multi-doctor care pathways.
Our Approach
We started by interviewing 8 patients — ranging in age from 28 to 72. The oldest three participants became our design benchmark: if they could use it without help, everyone could.
Large tap targets (minimum 48px), high contrast throughout, a persistent bottom navigation with clear labels and icons, and a one-screen-one-task principle that prevented cognitive overload.
Onboarding was reduced to four screens with optional fields — we asked for only what was strictly necessary to book a first appointment. Everything else could be filled in later.
Built in Flutter with Riverpod for state management and Firebase for auth, Firestore for data, and Cloud Messaging for appointment reminders. We used a custom calendar widget — the existing Flutter calendar packages were all too dense for our users.
"Hiring ABxDesign was the best decision we made. The app our oldest test users could navigate with zero help is the one that got a 4.8 rating." — The Product Lead
The Outcome
The app launched on iOS and Android simultaneously in December 2023. By March 2024, it had 50,000+ downloads and a 4.8★ rating on the App Store — driven almost entirely by five-star reviews praising ease of use.
The oldest user to leave a review was 74 years old. She gave it five stars and wrote: "Finally an app I can use on my own."
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