Chop Iron is a workout tracker with a Nigerian voice. It includes 53 exercises, workout history, personal records, progress charts, and achievement tracking, with workout data stored locally.
Why I built it
I train, forget my numbers, and sometimes struggle to stay consistent. I wanted a tracker that made logging workouts feel simple instead of turning the gym into another admin task. Chop Iron grew from that idea, with a bit of Nigerian personality thrown in because fitness apps don't all have to sound the same.
| Year | 2026 |
| Type | Mobile app |
| Client | Personal project |
| My role | Mobile engineering |
| Platform | iOS & Android |
The guiding question was simple: does this make it easier to record a set and understand my progress? That shaped the offline-first architecture, compact workout flows, and copy built around the phrase, 'No dull. Go chop iron.'
53
built-in exercises
12
SQLite tables
4
personal-record categories
Offline-first
local workout storage
Chop Iron Splash Screen
Splash Screen Alt
Onboarding Step 1
Onboarding Step 2
Onboarding Step 3
Onboarding Step 4
Body Type Selection
Goal Selection
Home screen with streak calendar
Home screen detail
Calendar View
Calendar Detail
Logging a workout
Exercise library with 53 exercises
Exercise Detail
Exercise Demo
Push Exercise
Shoulder Exercise
Progress screen with charts
Achievements and milestones
Profile and stats overview
Profile Avatar
Profile Overview
Profile Details
Profile Settings
Edit Profile
Challenge
Workout history has to stay consistent as records change. Streaks depend on distinct training days, personal records depend on previous sets, and achievements may need to be recalculated when a workout is edited or deleted.
Action
Local-first SQLite architecture
I used React Native, Expo, Zustand, and SQLite to store workout data locally. The database is organized across 12 tables, allowing workout logging and history access without requiring a network connection.
Workout calculations and progress
I implemented calculations for estimated one-rep max using the Epley formula, training volume, rep records, workout streaks, and achievement thresholds.
Motion and product personality
I used Reanimated for interactive bottom sheets and gestures, then carried the product's Nigerian/Pidgin voice through a dark interface designed around quick workout logging.
Result
Chop Iron brings workout logging, history, and progress tracking into a local-first mobile app. It helped me work through local data consistency, derived calculations, and interaction design without making connectivity a requirement for everyday use.