Personal Fitness Tracker
A running coach app that guides each run by heart rate, fully offline.
- Type
- Studio product
- Role
- Design, development and testing
- Year
- 2026
- Platform
- Mobile app
- Training plan
- 12 wk
- Heart rate updates
- 1 s
- Screens
- 8
Overview
The app connects to a chest heart rate strap and coaches the runner live through a 12 week plan. After each run it explains what happened and how training is going.
Challenge
Most fitness apps show generic charts and need the cloud. This runner needed live, reliable coaching from a heart rate strap, with the phone in a pocket and the screen off.
Approach
We built a spoken coach that reacts to heart rate every second and follows a structured plan. All data stays on the phone, and an optional voice assistant answers questions during the run.
Outcome
A finished app with eight screens covering today's readiness, live runs, history and trends. It tracks pace, effort and training load across the full 12 week plan.
Key features
Live coaching from a heart rate strap
Connects over Bluetooth and speaks up when you drift out of your target zone.
Optional voice assistant
Ask a question mid run and get a short spoken answer.
A structured 12 week plan
Easy runs, intervals, recovery weeks and a final 5K time trial.
Fair pace on hills
Corrects phone GPS height data so effort on climbs is measured fairly.
A clear review after every run
Effort, pace, training load and early warnings about overtraining.
Works offline
Everything is stored on the phone, with optional sync and export to other running apps.
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