I’ve never used an “app” period. Come to think of it, I haven’t owned a cell phone of any sort since the early nineties when they were the size of a military Walkie-Talkie.
My first cell phone was around 1999 when my company issued me a “Nextel” that i HATED then it’s only gotten worse since then.
I still have nightmares where that “Alert” sound goes off in my dream while sleeping at 2am...