— Health & Fitness
Connected Fitness & Nutrition App
iFit
iFit needed a mobile companion that could reliably talk to a wrist wearable, merge step data with what users logged about exercise and meals, and tell them how many calories they could still eat to hit their daily goal. Over four years we built native apps on both platforms with hardened Bluetooth logic, a daily calorie engine, recipe and workout libraries, and a chat experience engineered from scratch.
- Bluetooth LE
- Wearable sync
- Real-time
- Daily calorie target
- Recipes, workouts, chat
- Product surface
The challenge
Wearable sync had to work all day, every day—through backgrounding, OS Bluetooth quirks, and intermittent RF. Corrupt or partial step packets could skew calorie math and erode user trust. Beyond hardware, the product needed recipes, streamable workouts, social chat, and a single daily number users could act on: calories remaining against their goal.
Our approach
We built a cross-platform BLE stack with reconnect policies, packet validation, and recovery when the wearable dropped or sent bad data. A unified model combined wearable steps, manual exercise entries, food logs, and personal goals into a daily calorie budget surfaced in the home experience. Recipes and on-demand workouts lived alongside a chat system we designed and implemented end to end—real-time messaging, presence, and notifications tied into the same account and goal context.
Results
Members got a dependable link between their wrist band and daily nutrition targets, with fitness content and community chat in one app. Connection failures and corrupt readings were handled without silent data loss, so calorie guidance stayed credible through long sessions and messy real-world use.
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