After looking into other running apps started using Runkeeper from Asics which had the interval timer, but I had to set it every time and it wasn't able to be saved as a default/preference. Then the app suddenly started freezing on my phone.
So once again, I was looking for an option. Strava is a popular running app because of its social aspects. So I decided to give it a try. Now, I'm not upgrading to premium right now but I am going to try tracking with it for a few weeks. I also found a second free app, Interval Timer - HIIT Training, which allows me to just set a custom timer which beeps in repeating intervals.
We'll see what happens. Maybe the social aspect of Strava will be good for me.