Thank you! I have been dreaming of building a similar app, with the addition that I wanted to track my heart rate at the same time. I would use it for HIIT gym sessions where the segments are asymmetrical (60 seconds vs 30)

I think you need a favicon for when installed on the homescreen. This tool provides all the necessary html: https://realfavicongenerator.net/

I have added the icons in the `manifest.json` file but as you said the are still not showing up, will fix this up later today.

Thank you.