Nikola Paunović

Senior Backend Engineer · Berlin

View the Project on GitHub paunik/cv

Why I’m Building My Own Running App

Running is my main hobby outside of work. Over time I moved from “just go out and run” to proper structure: intervals, tempo, long runs, race blocks. I already owned an Apple Watch and did not want to switch to Garmin just to get better workout tools.

Why not just use Garmin?

Garmin offers amazing tools for training plans and structured workouts, but they come with trade‑offs:

So the decision was: stick with Apple Watch and try to make it work for serious, but not professional‑level, training.

The gap with existing Apple Watch tools

Once I committed to Apple Watch, the friction started to show.

Most apps that can create structured workouts and sync to Apple Watch had at least one of these issues:

I almost stopped developing my app when Apple released iOS 26 with a native workout builder. But it was missing the calendar view – no way to plan a full week or month ahead, drag sessions around, or see your entire schedule at a glance. DC Rainmaker covered it well here. That gap actually reignited the project.

I don’t need the full pro‑coach stack. I want to hit certain goals (like a marathon time), but I’m not trying to live like a professional athlete.

What I actually wanted

The wish list turned out to be pretty simple:

No platform really hit that sweet spot for Apple Watch users who are serious but not professional.

The app I’m building

That’s why I started building my own app:

A lightweight structured‑training builder on iPhone, with reliable sync to Apple Watch, designed for self‑coached runners.

The focus is on:

Try WeekPace

The app described on this page became WeekPace – a lightweight iOS and Apple Watch app for planning your training week and syncing structured workouts straight to your wrist.