​I built an app that plays voice messages from your friends during your run (triggered by GPS)

Hey runners / builders 👋

I’ve been running for a few years now, and during marathon prep I kept hitting the same thing: long runs can get really lonely—especially when you’re far from friends and family.

At some point I thought:
“I wish I could hear their voices around km 30, when everything starts falling apart.”

I looked for something simple that could do that… couldn’t find anything. So I built it.

The app is called Cobbr.
The idea is pretty straightforward:

You add a race or a run You generate a link Your friends/family can record short voice messages (no app needed) You choose at which kilometer each message plays During your run, the app uses GPS to trigger them automatically

So instead of music or silence, you suddenly hear someone you know cheering you on exactly when you need it.

Right now it’s only on iOS, Android is coming soon.

I’m mainly looking for feedback:

Does the concept make sense to you? Would you actually use this during a race or long run? Anything that feels unclear or overcomplicated?

Also happy to share more about how I built it if that’s interesting.

Thanks 🙏 and good luck to anyone training for a race right now 🏃‍♂️