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