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FitFiends product interface
Our work / Mobile App Development

FitFiends: a fitness app that turns daily activity into a digital pet you keep alive

Resourcifi built FitFiends, a native iOS app where a digital pet called a Fiend grows with your steps, learns what you eat from a photo, and pulls friends into gamified challenges that make movement a game worth winning.

3 Core Step tracking, food detection, gamified challenges
Stanford DOW Snak King Narda Proximity Learning Nextgen Living University of Guelph Lenze iAutomation Emory University IKEA
600+ projects 95% repeat clients 4.9 on Clutch
Industry
Fitness & Wellness
Engagement
Project Build
Platform
iOS, Android
Services delivered
7 workstreams
Timeline
Focused build cycle with continuous iteration.
The challenge

What FitFiends needed to solve.

Most fitness apps log numbers and hope motivation follows. FitFiends wanted activity to feel personal and playful instead, so it tied every step, meal, and challenge to a digital pet that thrives when the user moves and a friendly rivalry that keeps friends pushing each other forward.

Goals
  • Make daily activity feel personal through a digital pet
  • Reward steps automatically with points and progress
  • Let users log a meal from a single photo
  • Pull friends into challenges with shared scoreboards
  • Keep the experience playful without losing accuracy
The solution

Resourcifi designed and built FitFiends as a native iOS app powered by HealthKit, the Nutritionix API, and a real time SocketIO layer. A customizable Fiend reflects the user's activity, step data flows in from HealthKit and converts to points, a photo runs through food recognition for instant nutrition, and challenges sync live so friends compete on the same board.

What we built

The FitFiends build, screen by screen.

01 · Pet home and activity

A Fiend that lives off your steps

The home screen opens on the user's Fiend with a health and energy bar, today's step ring, and the points it has earned, so activity has a face the moment the app launches.

  • Your Fiend front and center
  • Health and energy bar
  • Today step count ring
  • Points earned from activity
SwiftHealthKit API
02 · Customize your Fiend

Make the monster your own

A customize screen puts the Fiend on a clean stage with skin and horns tabs and a row of options, so users can shape a pet they want to keep feeding with steps.

  • Skin and horns segmented tabs
  • Row of swappable options
  • Live preview of the Fiend
  • Variants to switch between
SwiftPet system
03 · Choose your game

Pick a challenge, drag in friends

Choose your Game offers in app and out of app games on bright cards, then lists challenged friends with their scores and a tap to confirm who is in.

  • In app and out of app games
  • Stock and unlock game pills
  • Challenged friends with scores
  • One tap to confirm a friend
SocketIOMySQL
04 · Step tracking detail

Steps that turn into points

The step view rings the day's progress against a goal, breaks the week into bars, and shows the points each day of movement put into the user's account.

  • Daily step goal ring
  • Weekly step bars
  • Points earned per day
  • Distance and active time
HealthKit APIPoints engine
05 · Food detection result

Snap a meal, get the numbers

A photo runs through food recognition and returns the dish with calories and a macro breakdown, so logging a meal is a picture rather than a search.

  • Recognized dish from a photo
  • Calories and macro split
  • Carbs, protein, and fat bars
  • Add to the daily log
Nutritionix APISwift
06 · Profile and integrations

Your Fiend, friends, and connections

The profile screen holds the user's points, friends, and connected services, with HealthKit and notifications managed from one place that stays in sync.

  • Points and friend count
  • Connected HealthKit toggle
  • Friends and invites
  • Notification controls
AWS backendCross device sync
How we worked

From discovery to a production build.

01

Discovery

shape the Fiend concept and game loop with the FitFiends team

02

Design

build the playful brand system, the pet, and the customization flow

03

Build

ship the iOS app, points engine, and challenge layer together

04

Integration

connect HealthKit, the Nutritionix API, and SocketIO

05

Release

launch on the App Store and tune challenges and rewards

Resourcifi engineers building the FitFiends mobile app
Outcomes

The numbers the build moved.

$50K+
Development cost saved
3 Core
Step tracking, food detection, gamified challenges
5+
Integrations
The stack

What FitFiends runs on.

Mobile

Swift

Native iOS app and pet animation

Health

HealthKit API

Step data and activity into points

AI

Nutritionix API

Food image recognition and nutrition

Realtime

SocketIO and AWS

Live challenges, scoring, and MySQL data

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