Less setup between sessions
Reusable routines bring an ordered exercise list into a new workout. Custom exercises and kilograms or pounds let people record the way they train, without rebuilding a familiar session each time.
Swiftkraft project / 01In development
RepLog.
More lifting.
Less logging.
A workout logger for iPhone, designed and built by Swiftkraft. From reusable routines to Live Activity rest timers, the focus is on making a session easier to record and revisit.
- Platform
- Native iOS
- Project
- Our own product
- Scope
- iOS app & launch website
Built for your next set.
Selected preview: RepLog workout summary with completed sets, duration, and training volume.
The problem
Your attention belongs
on the workout.
Between sets, a workout log needs to make the next action obvious. RepLog is built for people who want to record their training, repeat familiar routines and look back at earlier sessions without a lengthy setup.
That shaped the core flow: start a workout, add exercises or load a routine, record each set, then finish and revisit the session. Weight, reps, duration, distance and notes have a place without requiring a RepLog account.
This is our own product, in active development toward its first public release. The work below shows the decisions and implementation behind the current build.
Design & engineering
The decisions
behind the experience.
Workout data stays close
SwiftData stores workouts, exercises, sets and routines on the iPhone. Core logging works without a RepLog account, and detailed training records are kept out of the website and waitlist database.
A timer beyond the app
ActivityKit brings the rest countdown to the Lock Screen and Dynamic Island on supported devices. Remaining time is calculated from a deadline, with saved state for pauses and app restarts.
Useful analytics, fewer details
Explicit product events help us understand feature usage. Workout names, exercise names, notes and set values are excluded. Session replay and interaction autocapture are disabled, and an in-app setting controls analytics.
Tests for the details that matter
Persistence tests save and reopen a file-backed store to check exercise order and weight units. Timer tests cover restoration, pause and expiry, targeting the details that make a workout log useful over time.
A launch flow built alongside it
The separate Next.js launch website accepts waitlist signups, validates email addresses and handles repeat submissions. A saved signup is retained even if its notification email fails.
Made withSwiftSwiftUISwiftDataWidgetKitActivityKit
Where the project stands
Built so far.
What comes next.
In the current build
- Workout creation, editing, completion and history.
- Reusable routines, custom exercises and saved weight units.
- Local storage, configurable rest timers and Live Activities.
- A live launch website and email waitlist.
Before the first public release
Private iCloud recovery is part of the release plan and still needs integration and device validation. Insights and purchase flows also need release validation, alongside final App Store preparation.
The app is pre-release. These are the next delivery steps; the launch waitlist is available today.
Your next project
Planning a native iOS app?
RepLog brings together product flows, local data, native iOS features and launch preparation. Talk to us about your users and what your first release needs to do.